Marin Cilic, of Croatia, plays Pablo Carreno Busta, of Spain, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Pablo Carreno Busta, of Spain, plays Marin Cilic, of Croatia, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Marin Cilic, of Croatia, plays Pablo Carreno Busta, of Spain, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Pablo Carreno Busta, of Spain, reacts while playing Marin Cilic, of Croatia, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Pablo Carreno Busta, of Spain, plays Marin Cilic, of Croatia, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)