Roger Federer of Switzerland returns a hit against Dmitry Tursunov of Russia in the first round of the men's singles of the Olympic tennis competition in Beijing, China, Aug. 11, 2008. Federer beat Tursunov 2-0. (Xinhua/Wang Yuguo)

Rafael Nadal of Spain returns a hit against Potito Starace of Italy in the first round of the men's singles of the Olympic tennis competition in Beijing, China, Aug. 11, 2008. Nadal beat Starace 2-1. (Xinhua/Wang Yuguo)