World Championship Swimmers to Watch

Ous Mellouli made big splashes by winning swimming's marathon event, the 1,500-meter freestyle, at the 2008 Olympics and 2009 world championships. But he diversified in this year's USA Swimming Grand Prix series. Mellouli won 12 total events over seven meets, second only to Michael Phelps.

Potential Events
200 free
400 free
800 free
1,500 free