Elina Svitolina, of Ukraine, reacts after scoring a point against Leylah Fernandez, of Canada, during the quarterfinals of the US Open tennis championships, Tuesday, Sept. 7, 2021, in New York. (AP Photo/Elise Amendola)

Leylah Fernandez, of Canada, returns a shot to Elina Svitolina, of Ukraine, during the quarterfinals of the US Open tennis championships, Tuesday, Sept. 7, 2021, in New York. (AP Photo/Elise Amendola)

Elina Svitolina, of Ukraine, returns a shot to Leylah Fernandez, of Canada, during the quarterfinals of the US Open tennis championships, Tuesday, Sept. 7, 2021, in New York. (AP Photo/Elise Amendola)

Leylah Fernandez, of Canada, reacts after scoring a point against Elina Svitolina, of Ukraine, during the quarterfinals of the US Open tennis championships, Tuesday, Sept. 7, 2021, in New York. (AP Photo/Elise Amendola)

Elina Svitolina, of Ukraine, reacts after losing a point to Leylah Fernandez, of Canada, during the quarterfinals of the US Open tennis championships, Tuesday, Sept. 7, 2021, in New York. (AP Photo/Elise Amendola)

Ukraine's Elina Svitolina celebrates a point against Canada's Leylah Fernandez during their 2021 US Open Tennis tournament women's quarter-finals match at the USTA Billie Jean King National Tennis Center in New York, on September 7, 2021. (Photo by Kena Betancur / AFP)

Canada's Leylah Fernandez hits a return to Ukraine's Elina Svitolina during their 2021 US Open Tennis tournament women's quarter-finals match at the USTA Billie Jean King National Tennis Center in New York, on September 7, 2021. (Photo by Kena Betancur / AFP)

Canada's Leylah Fernandez hits a return to Ukraine's Elina Svitolina during their 2021 US Open Tennis tournament women's quarter-finals match at the USTA Billie Jean King National Tennis Center in New York, on September 7, 2021. (Photo by Kena Betancur / AFP)

Canada's Leylah Fernandez celebrates a point against Ukraine's Elina Svitolina during their 2021 US Open Tennis tournament women's quarter-finals match at the USTA Billie Jean King National Tennis Center in New York, on September 7, 2021. (Photo by Kena Betancur / AFP)

Ukraine's Elina Svitolina reacts during her 2021 US Open Tennis tournament women's quarter-finals match Canada's Leylah Fernandez against at the USTA Billie Jean King National Tennis Center in New York, on September 7, 2021. (Photo by Kena Betancur / AFP)

210908 -- NEW YORK, Sept. 8, 2021 -- Leylah Fernandez of Canada serves against Elina Svitolina of Ukraine during their women s singles quarterfinals of the 2021 US Open in Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center in New York, the United States on Sept. 7, 2021. Photo by /Xinhua SPU.S.-NEW YORK-TENNIS-US OPEN-DAY 9-WOMEN S SINGLES MichaelxNagle PUBLICATIONxNOTxINxCHN