Ashleigh Barty, left, and John Peers, of Australia, celebrate after defeating Maria Sakkari and Stefanos Tsitsipas, of Greece, in a mixed doubles quarterfinal tennis match at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, left, and Maria Sakkari, of Greece, bump fists during a mixed doubles quarterfinal tennis match against Ashleigh Barty and John Peers, of Australia, at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ashleigh Barty, left, and John Peers, of Australia, celebrate after defeating Maria Sakkari and Stefanos Tsitsipas, of Greece, in a mixed doubles quarterfinal tennis match at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ashleigh Barty, top left, and John Peers, of Australia, prepare to return to Maria Sakkari, bottom right, and Stefanos Tsitsipas, of Greece, during a mixed doubles quarterfinal tennis match at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

John Peers, left, and Ashleigh Barty, of Australia, prepare to return to Maria Sakkari and Stefanos Tsitsipas, of Greece, during a mixed doubles quarterfinal tennis match at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)