stylistic:tone
2005 World championships

At the 2005 World Championship Trials, Phelps decided to drop his specialty events, the 400-meter individual medley and the 200-meter butterfly, and experiment with the 400-meter freestyle and the 100-meter freestyle. Phelps went on to win the 400-meter freestyle, the 200-meter freestyle, the 100-meter butterfly, the 100-meter freestyle, and the 200-meter individual medley at the Trials.

At the 2005 World Aquatics Championships, Phelps won a total of six medals, five golds and one silver. In the 400-meter freestyle, Phelps did not make it past the preliminary heats and finished 18th overall with a time of 3:50.53. Later that day, in the 4×100-meter freestyle relay, Phelps won his first gold in the Championships. Two days later, on July 26, Phelps won his second gold in the 200-meter freestyle with a new American national record (NR) time of 1:45.20, finishing ahead of Grant Hackett. Two days later, on July 28, Phelps finished seventh in the 100-meter freestyle final. Later that day, Phelps won his third gold in the 200-meter individual medley. On July 29, Phelps, along with Ryan Lochte, Peter Vanderkaay and Klete Keller, won the gold in the 4×200-meter freestyle relay with a time of 7:06.58. This was the fourth gold medal for Phelps. On July 30, Phelps swam in his last individual event, the 100-meter butterfly. In the final, Phelps could not match the speed of Ian Crocker and had to settle for silver, finishing 51.65 to 50.40, a new world record for Crocker. On July 31, 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.