ROME - AUGUST 01:  Michael Phelps of the United States (L) finishes just in front of Milorad Cavic of Serbia to win the gold medal and break a new world record in a time of 49.82 in the Men's 100m Butterfly Final during the 13th FINA World Championships at the Stadio del Nuoto on August 1, 2009 in Rome, Italy. Getty Images logo Getty Images 3 months ago

ROME - AUGUST 01: Michael Phelps of the United States (L) finishes just in front of Milorad Cavic of Serbia to win the gold medal and break a new world record in a time of 49.82 in the Men's 100m Butterfly Final during the 13th FINA World Championships at the Stadio del Nuoto on August 1, 2009 in Rome, Italy.