John Isner, the No. 12 seed and the only remaining American from the original 14-man contingent, advanced with a 7-6 (5), 6-3 victory over Russia's Nikolay Davydenko. Isner, slowed by an ankle injury earlier this season, said he feels good physically and mentally.
"It's a situation that's very good for me," the 6-foot-10 former University of Georgia player said. "In the U.S., (on a) hard court that bounces high and pretty slow, and have the fans on my side, I can't ask for anything more. All the surroundings bode extremely well for me. So I'm in a good place."
He said he wasn't concerned about upholding American honor, either.
"No, I don't," he said. "I guess yesterday wasn't a great day for our American men. But, you know, selfishly, I'm just worried about myself, really. I certainly want all those guys to do well. But at the same time, it's not my concern at all. My concern is myself and just trying to keep moving forward and keep getting better and get back to where I want to be."