Switzerland's Roger Federer plays a return to Uzbekistan's Denis Istomin 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/Thibault Camus)

Australia's Ashleigh Barty plays a return to United States's Bernarda Pera during their first round match on day three of the French Open tennis tournament at Roland Garros in Paris, France, Tuesday, June 1, 2021. (AP Photo/Christophe Ena)

United States's Sofia Kenin celebrates after defeating United States's Hailey Baptiste during their second round match on day 5, of the French Open tennis tournament at Roland Garros in Paris, France, Thursday, June 3, 2021. (AP Photo/Christophe Ena)

Ukraine's Elina Svitolina plays a return to United States Ann Li during their second round match on day 5, of the French Open tennis tournament at Roland Garros in Paris, France, Thursday, June 3, 2021. (AP Photo/Christophe Ena)

Serbia's Novak Djokovic plays a return to United States's Tennys Sandgren during their first round match on day three of the French Open tennis tournament at Roland Garros in Paris, France, Tuesday, June 1, 2021. (AP Photo/Christophe Ena)

Spain's Rafael Nadal plays a return to Australia's Alexei Popyrin during their first round match on day three of the French Open tennis tournament at Roland Garros in Paris, France, Tuesday, June 1, 2021. (AP Photo/Christophe Ena)