
Roger Federer of Switzerland returns the ball to David Ferrer of Spain during their third round of men's singles match at the 2017 Rogers Cup in Montreal, Canada, Aug. 10, 2017. Roger Federer won 2-1. (Xinhua/Andrew Soong)

Roger Federer of Switzerland returns the ball to David Ferrer of Spain during their third round of men's singles match at the 2017 Rogers Cup in Montreal, Canada, Aug. 10, 2017. Roger Federer won 2-1. (Xinhua/Andrew Soong)