Swimmers, beware: Michael Phelps' repertoire is still expanding.
The 19-year-old Olympic gold medalist withdrew from one of his signature events -- the 400-meter individual medley -- Friday and then showed he could dominate events he rarely swims.
Phelps led the entire way in the 400 freestyle, winning in 3 minutes, 47.79 seconds in the U.S. world championship swimming trials. It was the first time he's competed in that race since the 2003 summer nationals, and he made it look easy with a victory margin of nearly 1.6 seconds.
"I wanted to push it out in the first 200 and I pushed it pretty big. I was on American record pace," said Phelps, the first male qualifier on the American team. "I think, right now, it's the start of something."