Spain's Roberto Bautista Agut plays a return to Switzerland's Henri Laakosonen during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

Russia's Daniil Medvedev plays a return to United States's Tommy Paul during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

United States's Tommy Paul, left, plays a return to Russia's Daniil Medvedev during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

United States's Steve Johnson eyes the ball as he plays a return to United States's Frances Tiafoe during their first round match on day two of the French Open tennis tournament at Roland Garros in Paris, France, Monday, May 31, 2021. (AP Photo/Christophe Ena)

United States Serena Williams smiles after missing a point against Romania's Mihaela Buzarnescu during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

Stefanos Tsitsipas of Greece loses grip of his racket as he serves to Spain's Pedro Martinez during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Japan's Kei Nishikori reacts as he wins a point against Russia's Karen Khachanov during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

Venus Williams, left with doubles partner Coco Gauff of the United States prepare to play against EllenPerez of Australia and Saisai Zheng of China in a first round women's doubles match day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Venus Williams, left with doubles partner Coco Gauff of the United States prepare to play against EllenPerez of Australia and Saisai Zheng of China in a first round women's doubles match day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

EllenPerez of Australia, left, and Saisai Zheng of China prepare to play against Venus Williams and Coco Gauff of the United States in a first round women's doubles match day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Switzerland's Henri Laaksonen reacts as he defeats Germany's Yannick Hanfmann during their first round match of the French Open tennis tournament at the Roland Garros stadium Sunday, May 30, 2021 in Paris. (AP Photo/Michel Euler)

Germany's Alexander Zverev plays a return to Russia's Roman Safiullin during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Germany's Alexander Zverev celebrates after winning a point against Russia's Roman Safiullin during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Switzerland's Belinda Bencic plays a return to Russia's Daria Kasatkina during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)

Russia's Daria Kasatkina plays a return to Switzerland's Belinda Bencic during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Thibault Camus)