Nadal Williams sisters,come into U.S. Open 4th round
Serena Williams from the United States celebrates scoring during the 4th annular of the women’s singles accident adjoin France’s Severine Bremond at the US Open 2008 in New York, the United States, Sept. 1, 2008. Serena Williams won 2-0.

Serena Williams from the United States celebrates scoring during the 4th round of the women’s singles event against France’s Severine Bremond at the US Open 2008 in New York, the United States, Sept. 1, 2008. Serena Williams won 2-0. (Xinhua/Hou Jun)

Venus Williams of the United States returns a shot during the 4th round of the women’s singles event against Agnieszka Radwanska of Poland at the US Open 2008 held in New York, the United States, Sept. 1, 2008. Venus Williams won the match 2-0 and advanced to the next round. (Xinhua/Hou Jun)

Rafael Nadal of Spain serves during the 4th round of the men’s singles event against Sam Querrey of the United States at the US Open 2008 held in New York, the United States, Sept. 1, 2008. Nadal won the match 3-1 and advanced to the next round. (Xinhua/Hou Jun)

Rafael Nadal of Spain serves during the 4th round of the men’s singles event against Sam Querrey of the United States at the US Open 2008 held in New York, the United States, Sept. 1, 2008. Nadal won the match 3-1 and advanced to the next round. (Xinhua/Hou Jun)
