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Young shrugged off the tension with McEnroe, said the relationship with the USTA is fine, but also conceded that the win over Wawrinka was a big one.

“I’d like to think I’m a pretty tough person, deep down,” said Young, now ranked 84th in the world. “I just had to grow up a little bit. Everybody’s light goes on at a different time. Hopefully, mine’s coming on right now.”

Also playing well now is American John Isner. Isner beat another American, Robby Ginepri, 6-4, 6-3, 6-4 for his seventh straight win — a streak that earned him a title at a tuneup in Winston-Salem last week.

Isner’s next match comes against another American, Alex Bogomolov Jr., who won in straight sets. The 28-year-old Bogomolov, ranked 44th, is trying to kick his career into high gear after enduring, over the past decade, a failed marriage, a failed doping test and wrist surgery that briefly forced him into a teaching job in New York.

“I was ready” for this, Bogomolov said. “I was ready mentally, physically for this. It’s just that you never knew with tennis, especially with how my life was.”

American James Blake was also on the court Friday, a straight-set loser to fifth-seeded David Ferrer.

In women’s play, American Irina Falconi lost, and before Roddick played, U.S. teenager Christina McHale went on the show court and fell 6-2, 6-3 to No. 25 Maria Kirilenko of Russia.

“This one, it’s disappointing,” McHale said. “But, yeah, I think I just kind of have to take the positives from it and keep working hard and keep going.”

Same thing for Sock who, after the match, received an offer from Roddick to head down to Texas and practice with him at his house.

Quite a final chapter to an amazing night for the 18-year-old.

“It was the best tennis experience of my life,” Sock said. “You don’t really realize how big the stadium is, I think, until you get down there.”

If he stays on this path, he’ll be there plenty. Which wouldn’t make Roddick, who takes pride in mentoring America’s next generation, unhappy.

“I think we’ve got a couple of legit prospects,” he said, adding Young and 19-year-old Ryan Harrison to that list. “My favorite thing about them is that they compete. They really, really, really compete.”