Tomic had surgery on both hips in January. He said the discomfort he felt starting in the first round wasn't in the same spot, but he didn't want to risk aggravating it, especially against somebody like Ferrer who runs his opponents around the court.
Tomic planned to visit a doctor to figure out what's wrong. He said he doesn't ''want to muck around with that area.''
The 21-year-old Tomic has never been past the second round at the U.S. Open.