Home duo progress
Matches on Arthur Ashe Stadium have been very one-sided over the first two days but the crowd certainly got their money's worth from the contest between home favourite John Isner and Belgium's Xavier Malisse.
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Isner eventually came through 6-3 7-6 (7/5) 5-7 7-6 (11/9) while Malisse treated umpire Carlos Ramos to an ongoing tirade relating to a number of line calls, including a foul-mouthed rant at the end of the second set that earned him a formal warning.
Ninth seed Isner, who came into the tournament as one of the form players after winning the title in Winston Salem last week, said: "I knew the match today was going to be tough.
"A lot of people are projecting me to go far here, but I wasn't looking past this match. As you guys could see, I had my hands full. He doesn't mind playing me. He's played me well in the past and he did it again today.
"It got to a certain point there where it was anyone's match. I just got pretty fortunate at the end."
The success of America's Brian Baker has been one of the stories of the season and he was a 6-3 6-4 6-2 winner over Jan Hajek, seven years after his last US Open victory.
The 27-year-old was one of the world's top juniors and was beginning to make progress when injuries struck, ruling him out of the game for six years.
Most people thought Baker had retired but he gave the game one last go last summer and was so successful that he is now ranked 70th and reached the fourth round of Wimbledon as a qualifier.
Baker, who next faces Janko Tipsarevic, said: "I remember several years watching this on TV wishing I was here, so just to be here is an awesome feeling. And then, at the same time, the competitive side kicks over and I want to do really well."