Ugo Humbert, of France, returns to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, serves to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, returns to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, serves to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, returns to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, serves to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, serves to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, serves to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, gestures during a third round men's tennis match against Stefanos Tsitsipas, of Greece, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, returns to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, returns to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, serves to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, returns to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, wipes his face during a third round men's tennis match against Ugo Humbert, of France, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, prepares to return to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Stefanos Tsitsipas, of Greece, serves to Ugo Humbert, of France, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Ugo Humbert, of France, serves to Stefanos Tsitsipas, of Greece, during the third round of the men's tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)