Roger Federer of Switzerland ruturns the ball to Jo-Wilfried Tsonga of France during the quarterfinal of men's singles at the US Open tennis championships in New York, the United States, Sept. 8, 2011. Roger Federer won 3-0. (Xinhua/Shen Hong)
Roger Federer of Switzerland ruturns the ball to Jo-Wilfried Tsonga of France during the quarterfinal of men's singles at the US Open tennis championships in New York, the United States, Sept. 8, 2011. Roger Federer won 3-0. (Xinhua/Shen Hong)