American swimmer Michael Phelps broke his own world record in the 200-metre butterfly at the Pan Pacific Swim Championships Thursday night.
Phelps swam the race in one minute, 53.80 seconds. That breaks the marks of 1:53.93 he set at the 2003 world championships in Barcelona, Spain.
Phelps had to battle off a charge from Japan's Ryulchl Shibata to win the race.
© The Canadian Press, 2007