At the 2003 World Aquatics Championships, Phelps won four gold medals, two silver medals, and broke five world records. Phelps broke his first world record on July 22 in the semi-finals for the 200-meter butterfly. Phelps swam a 1:53. 93 to break his own world record of 1:54. 58 set in 2001 and became the first man to swim under 1:54. 00. In the final of the 200-meter butterfly, on July 23, Phelps easily won the gold medal, but did not come close to his world record with a time of 1:54. 35. Less than an hour later, Phelps swam the lead-off leg for the 4×200-meter freestyle relay. Phelps put up a solid time of 1:46. 60 (an American record) but the Americans could not match the depth of the Australians and ultimately finished second 7:10. 26 to 7:08. 58. In the 200-meter individual medley, Phelps dominated. On July 24, in the semi-finals of the 200-meter individual medley, he broke his own world record with a time of 1:57. 52. On July 25, in the final of the 200-meter individual medley, Phelps smashed his own record with a time of 1:56. 04 to win the gold medal and finished almost 3 seconds ahead of Ian Thorpe. About an hour before the final of the 200-meter individual medley, Phelps swam in the semi-finals of the 100-meter butterfly. Phelps dominated again, finishing in the top seed position with a world record time of 51. 47. However, in the final of the 100-meter butterfly, on July 26, Ian Crocker erased Phelps's world record with a time of 50. 98, to become the first man under 51 seconds. Phelps swam a 51. 10 (also under his former world record), but had to settle for silver. In the final of the 400-meter individual medley, on July 27, Phelps broke his own world record with a time of 4:09. 09 to easily claim the gold medal. About half an hour later, Phelps earned his final gold medal when the United States team won the 4×100-meter medley relay. Phelps did not swim in the finals, but still earned a medal because he swam in the heats.