Swimming at the 2007 World Aquatics Championships – Men's 100 metre freestyle

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The Men's 100 metre freestyle at the 2007 World Aquatics Championships was held at Rod Laver Arena in Melbourne. Heats and semifinals took place on March 28, with the final on March 29. 176 swimmers competed in 22 heats. Brent Hayden of Canada won the gold with a time of 48.43 seconds, followed by Filippo Magnini of Italy (silver) and Eamon Sullivan of Australia (bronze). The heats began at 10:21, semifinals at 19:00 on March 28, and the final at 19:42 on March 29. This was the 19th swimming event of the championships.