Tennis lovers pose with a French flag at the Roland Garros stadium during their first round of the French Open tennis tournament Sunday, May 30, 2021 in Paris. (AP Photo/Christophe Ena)

United States Serena Williams prepares to serve to Romania's Irina-Camelia Begu 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/Michel Euler)

Russia's Daniil Medvedev plays a return to Kazakhstan's Alexander Bublik 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)

Poland's Iga Swiatek plays a return to Slovenia's Kaja Juvan 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)

A man walk in the stadium during the first round match at the Roland Garros stadium Sunday, May 30, 2021 in Paris. (AP Photo/Christophe Ena)

Poland's Iga Swiatek serves to Slovenia's Kaja Juvan 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)

Italy's Jannik Sinner pcelebrates after winning a point against Pierre-Hugues Herbert of France 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/Michel Euler)

Slovenia's Tamara Zidansek celebrates after defeating Canada's Bianca Andreescu 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)

Canada's Bianca Andreescu plays a return to Slovenia's Tamara Zidansek 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's Sofia Kenin plays a return to Ukraine's Elina Ostapenko 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/Michel Euler)

Poland's Iga Swiatek plays a return to Slovenia's Kaja Juvan 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)

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)