Belinda Bencic, of Switzerland, reacts after defeating Marketa Vondrousova, of the Czech Republic, in the women's gold medal match of the tennis competition at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Belinda Bencic, of Switzerland, reacts after defeating Marketa Vondrousova, of the Czech Republic, in the women's gold medal match of the tennis competition at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Belinda Bencic, of Switzerland, poses with the gold medal in the women's singles of the tennis competition at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Gold medalist Belinda Bencic, of Switzerland, wipes a tear during the medal ceremony for women's singles of the tennis competition at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Belinda Bencic, of Switzerland, is hugged by Marketa Vondrousova, of the Czech Republic, following the women's gold medal match of the tennis competition at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. Bencic won the match. (AP Photo/Seth Wenig)

Gold medalist Belinda Bencic, middle, of Switzerland, silver medalist Marketa Vondrousova, left, of the Czech Republic, and bronze medalist Elina Svitolina, of the Ukraine, pose following the women's single matches of the tennis competition at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)