No 1 Caroline Wozniacki rallies, advances at U.S. Open quarterfinals
World number 1 player, Caroline Wozniacki and Novak Djokovic advanced to the quarterfinals, while former number one, Serena Williams reached the last eight in 2011, the U.S. Open.Serbian world number 1, Novak Djokovic was the most dangerous men in the victory of the season in a row against rallied past Ukrainian, Oleksandr Dolgopolov in two sets with a score line of 7-6 (14), 6-4, 6-2 to advance to the quarterfinals in two hours and 26 minutes in 2011 U.S. Open.

While women's number 1, Caroline Wozniacki showed incredible spectacular performance in the fourth round, to overcome the Russian 2004 U.S. Open champion Svetlana Kuznetsova in three sets of the match with a 6-7 (7) 5.7 6-1 to book her place in the quarterfinals 2011 U.S. Open in New-York.Three time U.S. Open champion and former world number one Serena Williams secured berths in the quarterfinals on Monday, beating former world number one Serb, Ana Ivanovic in straight sets with a score line of 6-3, 6 -4.

Although the U.S. the best player in the men's seeded, Mardy Fish was knocked out against Frenchman Jo-Wilfried Tsonga in a thrilling five with a meeting with a score line of 6-4 6-7 (7) 3-6 6-4 6-2. would have been a little disappointing fans in the U.S., because the best players were seeded beaten in the fourth round of the U.S. Open.