Men's round-up - day three
Wimbledon champion Roger Federer limped past Jose Acasuso to book his place in the second round of the US Open.
The number two seed dropped the opening set as he struggled to come to terms with the huge first serve of his gutsy Argentine opponent.
But the Swiss star forced his way back into the game, winning the next two sets before Acasuso was forced to retire with a back injury.
"I was already winning when he got injured and I felt in control so I wasn't too worried," said Federer, heading off suggestions he had been fortunate.
"I felt really good during the match from a physical point of view. I was a little impatient early on but I bounced back and I was serving pretty good."
Australian Mark Philippoussis swept into the second round with a 6-2 7-6 (7/4) 6-4 triumph over Serbian qualifier Janko Tipsarevic.
The 20th seed will now face Frenchman Anthony Dupuis, who came from behind twice to beat Russia's Mikhail Youzhny 5-7 6-4 3-6 6-3 7-5.
Jiri Novak and Carlos Moya also had to fight hard for a place in round two.
Novak, the 10th seed, lost the first and third sets before running out a 3-6 6-3 5-7 6-2 6-2 winner against Croatia's Mario Ancic.
Seventh seed Moya also lost the opening set against Australia's Scott Draper but hit back to win 4-6 6-4 7-5 7-6.
There was little trouble for 13th seed David Nalbandian, who saw off Germany's Philipp Kohlschreiber 6-4 7-6 6-3.
Younes El Aynaoui was also in fine form as he breezed past American Alex Kim 7-5 7-6 (7/5) 6-3.
There were also straight-sets wins for Swede Thomas Enqvist and American James Blake.
Enqvist beat Spaniard Albert Portas 6-2 6-3 6-1 while Blake disposed of 27th seed Mariano Zabaleta 7-6 6-3 6-2.