
Stan Wawrinka of Switzerland returns the ball during the men's singles round of 16 match with Gael Monfils of France at French Open Tennis Tournament 2017 in Roland Garros, Paris, France on June 5, 2017. Wawrinka won 3-0. (Xinhua/Han Yan)

Stan Wawrinka of Switzerland returns the ball during the men's singles round of 16 match with Gael Monfils of France at French Open Tennis Tournament 2017 in Roland Garros, Paris, France on June 5, 2017. Wawrinka won 3-0. (Xinhua/Han Yan)