At the 2007 World Aquatics Championships, Phelps won seven gold medals, tying the record for a global long-course championship held by Mark Spitz since the 1972 Summer Olympics, and broke five world records. Phelps first gold medal came in the 4×100-meter freestyle. Phelps swam the lead-off leg in 48.42 seconds and Neil Walker, Cullen Jones and Jason Lezak each expanded the lead to win in a Championship record of 3:12.72, just missing the world record of 3:12.46 set the previous year. His lead-off time was faster than the winning time in the individual 100-meter freestyle final later in the meet. Phelps set his first world record in the Championships in the 200-meter freestyle, his second race. Phelps won the gold ahead of Pieter van den Hoogenband and broke Ian Thorpe's six-year-old world record with a time of 1:43.86. For his third race, the 200-meter butterfly, Phelps won the gold and bettered his own world record of 1:53.71 with a time of 1:52.09. For his fourth race, the 200-meter individual medley, Phelps set his third world record with a time of 1:54.98, bettering his own world-record time of 1:55.84 For his fifth race, the 4×200-meter freestyle relay, Phelps swam the lead-off leg in 1:45.36 as the American team of Ryan Lochte, Klete Keller, and Peter Vanderkaay went on to win the gold medal and beat the previous world record set by Australia in 2001 with a time 7:03.24. For his sixth race, the 100-meter butterfly, Phelps edged out Ian Crocker 50.77 to 50.82 to win his sixth gold medal. For his seventh event, the 400-meter individual medley, Phelps won the gold medal in a world-record time of 4:06.22, more than 3.5 seconds ahead of Ryan Lochte. By winning seven gold medals, Phelps broke the record of six set by Ian Thorpe at the 2001 World Championships. The 4×100-meter medley relay team received a disqualification for a false start during a changeover in the heats, ending Phelps's chance of eight gold medals.