WORLD RECORD: Phelps Under 50s Butterfly WR Set in Rome 2009 FINA World Championships

SAT AUG 01 2009 — Michael Phelps became the first human to break 50 seconds in the Men’s 100 meter butterfly with a time of 49.82 seconds at the 13th FINA World Championships 2009 in Rome, Italy.

Reaction time was 0.69 seconds.