us open Tennis 2009 Watch Online

Australian Open champion Nadal will next play Nicolas Kiefer. The German moved on by beating France's Michael Llodra 6-3 6-4 6-4.

Top seed and five-times champion Federer withstood an inspired challenge from Greul before he defeated the pesky journeyman in straight sets.

The 28-year-old Greul squandered two set points in the second set and a 3-0 lead in the third, eventually succumbing to Federer's punishing groundstrokes.

Federer had the decisive third-set break against the German in the 11th game to take a 6-5 lead.

Greul wasted yet another break point on Federer's serve before the Swiss closed out the match with his eighth ace.

Former champion Marat Safin bid farewell to the US Open with a 1-6 6-4 6-3 6-4 defeat by Austrian Jurgen Melzer.

Safin's Grand Slam career came to an end when he punched a backhand into the net to end the two-hour, 13-minute match under sunny skies at Louis Armstrong Stadium.

The 29-year-old Russian, who won the 2000 U.S. Open and was formerly the world's top-ranked player, had already announced plans to retire at the end of the year.

Safin also won the Australian Open in 2005. He is the older brother of women's world number one Dinara Safina.

Sixth seed Juan Martin Del Potro showed he was in good form with a 6-3 6-3 6-1 win over fellow Argentine Juan Monaco.