Williams sisters, Nadal through 4th round at U.S. Open

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

Rafael Nadal of Spain celebrates a score 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.