Barbora Krejcikova, of the Czech Republic, returns to Belinda Bencic, of Switzerland, during second round of the men's tennis competition at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Belinda Bencic, of Switzerland, serves to Barbora Krejcikova, of the Czech Republic, during second round of the men's tennis competition at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Belinda Bencic, of Switzerland, serves to Barbora Krejcikova, of the Czech Republic, during second round of the men's tennis competition at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Belinda Bencic, of Switzerland, returns to Barbora Krejcikova, of the Czech Republic, during second round of the men's tennis competition at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Barbora Krejcikova, of the Czech Republic, returns to Belinda Bencic, of Switzerland, during second round of the men's tennis competition at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)