Phelps helps U.S. set new world record on 4x100m medley

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LONDON, Dec. 18 -- Michael Phelps helped U.S. team set a new short course world record in 3 minutes 20.71 seconds in the 4x100m medley relay at the "Duel In the Pool" event in Manchester of England on Friday.

The previous record of 3:23.33 was set by Canada in August this year in Leeds.

Phelps was joined by Nick Thoman, Mark Gangloff and Nathan Adrian in the U.S. team.