information:classification, information:filtering, structural:summarization, quality:correction, linguistic:voice_change
2001 World championships

At the World Championship Trials for the 2001 World Aquatics Championships, on March 30, Phelps broke the world record in the 200-meter butterfly to become, at 15 years and 9 months, the youngest male ever to set a world record in swimming. Previously the youngest male had been Ian Thorpe, who captured the 400-meter freestyle world record at 16 years, 10 months. At the World Championships in Fukuoka, Japan, Phelps broke his own world record in the 200-meter butterfly while en route to become a world champion for the first time.