On July 9, 2009 (May 17 of the 2009 lunar calendar), Phelps broke the men's 100-meter butterfly world record. Phelps greets the audience at the awards ceremony on July 9, 2009. On the same day, in the men's 100-meter butterfly at the U.S. Swimming Championships, American star Phelps won the championship in 50.22 seconds and broke the world record in this event. On July 9, Phelps won. On July 9, Phelps was in the competition. In the men's 100-meter butterfly final at the U.S. Swimming Championships, American star Phelps easily won the championship and broke the world record in this event with a time of 50.22 seconds. The previous world record was 50.40 seconds, set by American player Ian Crocker in 2005. This is also the first time that Phelps has broken the world record since the end of the Olympics. In the final, Phelps's first 50 meters time was 23.83 seconds. Although he ranked first among eight players, it was slightly slower than Ian Crocker's 23.51 seconds when he swam the world record in 2005. However, Phelps showed strong sprint strength in the second half and finally finished the race in 50 seconds and 40 seconds, setting a new world record with an advantage of 0.18 seconds. Previously, in the 200-meter freestyle and 200-meter butterfly at the American Swimming Championships, Phelps successfully won both championships. However, his freestyle time was 1.27 seconds slower than the Beijing Olympics, and his butterfly time was 0.73 seconds slower. Comment: What a swimming genius.