Swimming at the 2009 World Aquatics Championships – Men's 4 × 100 metre medley relay

Men's 4×100 metre medley relay at the 2009 FINA World Championships
Venue	Foro Italico
Date	2 August 2009
Teams	47
Winning time	3 minutes 27.28 seconds
Medalists
United States Aaron Peirsol, Eric Shanteau, Michael Phelps, David Walters, Matt Grevers*, Mark Gangloff*, Tyler McGill*, Nathan Adrian*    Germany Helge Meeuw, Hendrik Feldwehr, Benjamin Starke, Paul Biedermann    Australia Ashley Delaney, Brenton Rickard, Andrew Lauterstein, Matt Targett, Christian Sprenger* * Swimmers who participated in the heats only
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The men's 4×100 metre medley relay at the 2009 World Aquatics Championships took place on 2 August 2009 at the Foro Italico in Rome, Italy.

The existing records when the event started were:

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