Five-times US Open winner and 16-times grand slam champion Roger Federer of Switzerland beat Jurgen Melzer, 6-3, 7-6, 6-3 to face Robin Soderling of Sweden in the quarterfinals of the U.S. Open Tennis Championship. Soderling defeated Albert Montanes of Spain 4-6, 6-3, 6-2, 6-3 to reach the quarterfinals.Meanwhile Novak Djokovic of Serbia demolished American Mardy Fish 6-3, 6-4, 6-1 to enter the quarters. Next in line for Djokovic is Gael Monfils who overpowered his countryman Richard Gasquet 6-4, 7-5, 7-5 to become the first Frenchman in a decade to reach the US Open quarter-finals.In the women's section Vera Zvonareva kept alive Russia's fading challenge with a rapid-fire 6-1, 6-2 victory over unseeded German Andrea Petkovic to erase the disappointment of her exit at the same stage last year.In another match Caroline Wozniacki eased past an error-prone Russian Maria Sharapova 6-3, 6-4. Estonia's Kaia Kanepi beat Belgium's Yanina Wickmayer 0-6, 7-6, 6-1 to reach the last eight against the only surviving Russian woman, Vera Zvonareva after the Wimbledon finalist outgunned Germany's Andrea Petkovic 6-1, 6-2. Wozniacki's next opponent is Dominika Cibulkova of Slovakia the only unseeded player left in the women's draw who advanced with a 7-5, 7-6 win over another former Russian champion, Svetlana Kuznetsova.Ace Indian Leander Paes and his Zimbabwean partner Cara Black suffered a straight-set defeat against Anna-Lena Groenefeld and Mark Knowles to bow out of the mixed doubles category of the US Open Tennis tournament in New York today. Second seeds Paes and Black, who won the 2010 Wimbledon mixed doubles title, lost 3-6, 4-6 to the German-Bahamian pair in the quarterfinal.Paes and Black had clinched the Australian Open mixed doubles title in January this year.India's Rohan Bopanna and his Pakistani partner Aisam-ul-Haq Qureshi are still in the race in men's doubles category and would take on South African-Belgian combo of Wesley Moodie and Dick Norman in the quarterfinal.