Rebecca Peterson, of Sweden, plays Elena Rybakina, of Kazakhstan, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Rebecca Peterson, of Sweden, plays Elena Rybakina, of Kazakhstan, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)

Elena Rybakina, of Kazakhstan, serves to Rebecca Peterson, of Sweden, during the second round of the tennis competition at the 2020 Summer Olympics, Monday, July 26, 2021, in Tokyo, Japan. (AP Photo/Seth Wenig)