Swimming at the 2003 World Aquatics Championships – Men's 100 metre butterfly
| Men's 100m Butterfly at the 2003 FINA World Aquatics Championships |
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| Dates | 25 July (prelims, semifinals) 26 July (final) |
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| Winning time | 50.98 seconds | |||||||||
| Medalists | ||||||||||
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The Men's 100 Butterfly event at the 10th FINA World Aquatics Championships swam 25–26 July 2003 in Barcelona, Spain. Preliminary and Semifinal heats swam July 25, with the prelims during the morning session and the semifinals in the evening session. The Final was held on July 26.
At the start of the event, the existing World (WR) and Championship (CR) records were both:
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