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Swimming at the 2009 World Aquatics Championships – Men's 4 × 100 metre medley relay
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.
Records
Prior to this competition, the existing world and competition records were as follows: The following records were established during the competition: ==Results==