Michael Phelps
The Two-time defending Olympic champion
London, England
On July 28, 2012, Phelps placed eighth in the morning prelims for the 400-meter individual medley. Phelps, the two-time defending Olympic champion, won his heat in 4 minutes, 13.33 seconds with a time that was well off his world record of 4:03.84 set four years ago in Beijing, when Phelps won a record eight gold medals.