"It's weird, the fear of kind of the unknown and not knowing what's going on," said Roddick, who withdrew from last week’s Rogers Cup in Toronto. "There were some days where it was good and some days where it was real bad. So it was like you would have one of those two or three good days, and it was like, 'OK, you're just being kind of a wimp.’
"I'm just glad that we found out something that was causing it. It's nice to have a little bit of clarity moving forward. It's not something that's going to affect me, anything super-serious. They think I'm most of the way through it, if not all the way through it."
With a third round loss to Gilles Simon in Washington having stalled his U.S. Open preparations, Roddick resumes duty this week at the Cincinnati Masters.