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)

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)