Felix Auger-Aliassime, bottom right, and Gabriela Dabrowski, of Canada, return to Stefanos Tsitsipas, top left, and Maria Sakkari, of Greece, during a first round mixed doubles tennis match at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Maria Sakkari, left, and Stefanos Tsitsipas, of Greece, speak during a first round mixed doubles tennis match against Gabriela Dabrowski and Felix Auger-Aliassime, of Canada, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)