Estonia's Kaia Kanepi hits a backhand to Croatia's Donna Vekic during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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South Africa's Lloyd Harris prepares to serve to United States' Mackenzie McDonald during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Estonia's Kaia Kanepi hits a forehand to Croatia's Donna Vekic during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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South Africa's Lloyd Harris hits a backhand return to United States' Mackenzie McDonald during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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South Africa's Lloyd Harris hits a forehand return to United States' Mackenzie McDonald during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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South Africa's Lloyd Harris hits a forehand return to United States' Mackenzie McDonald during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Estonia's Kaia Kanepi hits a forehand to Croatia's Donna Vekic during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Mackenzie McDonald reacts after winning the first set against South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic reaches for a backhand to Estonia's Kaia Kanepi during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Mackenzie McDonald hits a backhand return to South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Mackenzie McDonald hits a backhand return to South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Mackenzie McDonald reacts after winning the first set against South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic hits a forehand to Estonia's Kaia Kanepi during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Croatia's Donna Vekic hits a backhand to Estonia's Kaia Kanepi during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Croatia's Donna Vekic hits a backhand to Estonia's Kaia Kanepi during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Mackenzie McDonald serves to South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic hits a backhand to Estonia's Kaia Kanepi during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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South Africa's Lloyd Harris hits a backhand return to United States' Mackenzie McDonald during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Mackenzie McDonald hits a backhand return to South Africa's Lloyd Harris during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady hits a backhand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Jennifer Brady hits a backhand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Jennifer Brady celebrates a point against Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Jennifer Brady hits a forehand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Jennifer Brady prepapres to hit a backhand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan throws her head back after a shot while playing United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan hits a backhand to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan hits a backhand to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan prepares to serve to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev serves to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic serves to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic serves to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic hits a backhand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic hits a forehand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Slovenia's Kaja Juvan hits a forehand to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic hits a forehand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady sits on the court after playing a point against Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic hits a forehand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady runs to hit a forehand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady hits a forehand to Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan throws her head back after a shot while playing United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan hits a backhand to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Slovenia's Kaja Juvan hits a backhand to United States' Jennifer Brady during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic hits a backhand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic reacts after losing a point against Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady celebrates her win over Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev wipes the sweet from his face during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev wipes the sweat from his face during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady celebrates her win over Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev wipes the sweat from his face during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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United States' Jennifer Brady celebrates her win over Slovenia's Kaja Juvan during their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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United States' Jennifer Brady, left, and Slovenia's Kaja Juvan meet at the net after Brady won their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic reacts during his third round match against Russia's Daniil Medvedev at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic reacts during his third round match against Russia's Daniil Medvedev at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic reacts during his third round match against Russia's Daniil Medvedev at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev reacts during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev reacts during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic reacts during his third round match against Russia's Daniil Medvedev at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic drops her racket as she celebrates her win over Estonia's Kaia Kanepi in their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Croatia's Donna Vekic drops her racket as she celebrates her win over Estonia's Kaia Kanepi in their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev receives treatment during his third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic celebrates her win over Estonia's Kaia Kanepi in their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic serves to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Serbia's Filip Krajinovic hits a forehand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic drops her racket as she celebrates her win over Estonia's Kaia Kanepi in their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev serves to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev hits a forehand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev reacts during third round match against Serbia's Filip Krajinovic at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Croatia's Donna Vekic, right, and Estonia's Kaia Kanepi meet at the net after Vekic won their match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Estonia's Kaia Kanepi walks off the court after her loss to Croatia's Donna Vekic her third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas serves to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic hits a forehand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev hits a forehand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Greece's Stefanos Tsitsipas hits a backhand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas hits a backhand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a backhand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a forehand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Serbia's Filip Krajinovic hits a backhand return to Russia's Daniil Medvedev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Sweden's Mikael Ymer serves to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a forehand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev, left, is congratulated by Serbia's Filip Krajinovic after winning their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev, left, is congratulated by Serbia's Filip Krajinovic after winning their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Sweden's Mikael Ymer celebrates winning a point against Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev hits a backhand return to Serbia's Filip Krajinovic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev is interviewed after defeating Serbia's Filip Krajinovic in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Daniil Medvedev gestures after defeating Serbia's Filip Krajinovic in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Sweden's Mikael Ymer celebrates winning a point against Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Daniil Medvedev gestures after defeating Serbia's Filip Krajinovic in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Greece's Stefanos Tsitsipas hits a forehand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas hits a backhand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a backhand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a backhand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer serves to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez runs to make a backhand return to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev serves to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev hits a forehand return to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez serves to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Sweden's Mikael Ymer hits a backhand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer hits a backhand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev serves to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Spain's Feliciano Lopez hits a forehand return to Russia's Andrey Rublev during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Sweden's Mikael Ymer hits a forehand to Greece's Stefanos Tsitsipas during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev hits a backhand return to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev serves to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev serves to Spain's Feliciano Lopez during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Greece's Stefanos Tsitsipas hits a forehand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev celebrates after defeating Spain's Feliciano Lopez in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev celebrates after defeating Spain's Feliciano Lopez in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Greece's Stefanos Tsitsipas hits a forehand to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev reacts after defeating Spain's Feliciano Lopez in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev, right, is congratulated by Spain's Feliciano Lopez after winning their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Greece's Stefanos Tsitsipas serves to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas serves to Sweden's Mikael Ymer during their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas left, and Sweden's Mikael Ymer meet at the net after Tsitsipas won their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas waves after defeating Sweden's Mikael Ymer in their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Greece's Stefanos Tsitsipas signs a television camera lens after defeating Sweden's Mikael Ymer in their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Sweden's Mikael Ymer walks off the court after losing to Greece's Stefanos Tsitsipas in their third round match at the Australian Open tennis championships in Melbourne, Australia, Saturday, Feb. 13, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand return to Switzerland's Belinda Bencic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens hits a forehand return to Switzerland's Belinda Bencic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Feb. 13, 2021.(AP Photo/Andy Brownbill)
