
Roger Federer of Switzerland returns the ball during the men's singles semifinal match with Tomas Berdych of the Czech Republic at the Championship Wimbledon 2017 in London, Britain on July 14, 2017. Roger Federer won 3-0. (Xinhua/Han Yan)

Roger Federer of Switzerland returns the ball during the men's singles semifinal match with Tomas Berdych of the Czech Republic at the Championship Wimbledon 2017 in London, Britain on July 14, 2017. Roger Federer won 3-0. (Xinhua/Han Yan)