Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Karen Khachanov during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Stefanos Tsitipas during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women???s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women???s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Mihaela Buzarnescu of Romania in action against Serena Williams (not seen) of the US during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Serena Williams wears shoes designed for her. The design is meant to pay homage to the Roland Garros stadium as well as her daughter Olympia Ohanian. Photo: Frank Molter/dpa

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan reacts after defeating Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Serena Williams of the US in action against Mihaela Buzarnescu (not seen) of Romania during the second round in the women?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Singles, Women, 2nd Round, Williams (USA) - Buzarnescu (Romania). Serena Serena Williams wears shoes designed for her. The design is said to be a tribute to the Roland Garros stadium as well as to her daughter Olympia Ohanian. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Tsitsipas (Greece) - Martinez (Spain). Stefanos Tsitsipas is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Tsitsipas (Greece) - Martinez (Spain). Stefanos Tsitsipas is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Tsitsipas (Greece) - Martinez (Spain). Stefanos Tsitsipas is in action. Photo: Frank Molter/dpa

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan reacts after defeating Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men???s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan reacts after defeating Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany argues with the referee during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany serves during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany reacts during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany serves during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany returns the ball during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- Alexander Zverev of Germany reacts during the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

210602 -- PARIS, June 2, 2021 -- A boy watches the men s singles second round match between Alexander Zverev of Germany and Roman Safiullin of Russia at the French Open tennis tournament at Roland Garros in Paris, France, June 2, 2021. SPFRANCE-PARIS-TENNIS-ROLAND GARROS-FRENCH OPEN-MEN S SINGLES-DAY 4 GaoxJing PUBLICATIONxNOTxINxCHN

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

Kei Nishikori during the second round of Roland Garros at Roland Garros on June 2, 2021 in Paris, France

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Alexander Zverev is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's singles, 2nd round, Zverev (Germany) - Safiullin (Russia). Ball kids are in action during the match. Photo: Frank Molter/dpa

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

PARIS, FRANCE - JUNE 02: Kei Nishikori of Japan in action against Karen Khachanov (not seen) of Russia during the second round in the men?????s singles of the French Open Tennis Tournament at Roland Garros in Paris, France on June 02, 2021. Mustafa Yalcin / Anadolu Agency/ABACAPRESS.COM

02 June 2021, France, Paris: Tennis: Grand Slam - French Open. A man sits alone in a spectator stand. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Williams is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Williams is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Williams is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Williams sits on the bench. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, Doubles, Men, 2nd Round, Yen-Hsun/Nishioka (Taiwan/Japan) - Krawietz/Tecau (Germany/Romania). Kevin Krawietz (l) and Horia Tecau stehan just behind the net. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, Doubles, Men, 2nd Round, Yen-Hsun/Nishioka (Taiwan/Japan) - Krawietz/Tecau (Germany/Romania). Kevin Krawietz (r) and Horia Tecau talk it over. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/WTA Tour - French Open, Women's singles, 2nd round, Williams (USA) - Buzarnescu (Romania). Serena Williams is in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, Doubles, Men, 1st Round, Haase/Struff (Netherlands/Germany) - Ebden/Smith (Australia). Jan-Lennard Struff (l) and Robin Haase celebrate after winning their match. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, Doubles, Men, 1st Round, Haase/Struff (Netherlands/Germany) - Ebden/Smith (Australia). Jan-Lennard Struff (l) and Robin Haase celebrate after winning their match. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's doubles, 1st round, Haase/Struff (Netherlands/Germany) - Ebden/Smith (Australia). Jan-Lennard Struff in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, Doubles, Men, 1st Round, Haase/Struff (Netherlands/Germany) - Ebden/Smith (Australia). Jan-Lennard Struff (r) and Robin Haase in action. Photo: Frank Molter/dpa

02 June 2021, France, Paris: Tennis: Grand Slam/ATP Tour - French Open, men's doubles, 1st round, Haase/Struff (Netherlands/Germany) - Ebden/Smith (Australia). Jan-Lennard Struff in action. Photo: Frank Molter/dpa

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

Internationaux de tennis de Roland-Garros 2021. French Open Tennis. Roland-Garros 2021. Rafael Nadal of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268569 2021-06-01 Paris France Nadal, Rafael

Internationaux de tennis de Roland-Garros 2021. French Open Tennis. Roland-Garros 2021. Rafael Nadal of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268569 2021-06-01 Paris France Nadal, Rafael

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak

French Open Tennis. Roland-Garros 2021. night session Novak Djokovic of Spain during day 3 of Roland-Garros 2021 French Open, a Grand Slam tennis tournament at Roland Garros stadium on June 1, 2021 in Paris, France. 268579 2021-06-01 Djokovic, Novak