
Stan Wawrinka of Switzerland returns the ball during the men's quarterfinal against Marin Cilic of Croatia at the 2017 French Open Tennis Tournament in Paris, France on June 7, 2017. Stan Wawrinka won 3-0.(Xinhua/Chen Yichen)

Stan Wawrinka of Switzerland returns the ball during the men's quarterfinal against Marin Cilic of Croatia at the 2017 French Open Tennis Tournament in Paris, France on June 7, 2017. Stan Wawrinka won 3-0.(Xinhua/Chen Yichen)