Michael Phelps holds the long course world record in 2 butterfly lengths and an individual medley.
 In the final of the 400-meter individual medley, on July 27, Phelps broke his own world record with a time of 4:09
 This swim went on to become the longest men's world record to stand in long course meters, beating Germany's Otto Farr who held the 100 backstroke world record from 1912 until 1926

