Diego Schwartzman, of Argentina, reacts during a tennis match against Juan Pablo Varillas, of Peru, at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)

Diego Schwartzman, of Argentina, returns to Juan Pablo Varillas, of Peru, during the tennis competition at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Patrick Semansky)