Serena Williams of the United States returns the ball during the women's singles second round match with Kurumi Nara of Japan at French Open tennis tournament 2019 at Roland Garros in Paris, France on May 30, 2019. Serena Williams won 2-0. (Photos: Xinhua/Han Yan)

Serena Williams of the United States returns the ball during the women's singles second round match with Kurumi Nara of Japan at French Open tennis tournament 2019 at Roland Garros in Paris, France on May 30, 2019. Serena Williams won 2-0.

Serena Williams of the United States returns the ball during the women's singles second round match with Kurumi Nara of Japan at French Open tennis tournament 2019 at Roland Garros in Paris, France on May 30, 2019. Serena Williams won 2-0.

Serena Williams of the United States reacts during the women's singles second round match with Kurumi Nara of Japan at French Open tennis tournament 2019 at Roland Garros in Paris, France on May 30, 2019. Serena Williams won 2-0.

Serena Williams of the United States greets the audience after the women's singles second round match with Kurumi Nara of Japan at French Open tennis tournament 2019 at Roland Garros in Paris, France on May 30, 2019. Serena Williams won 2-0.