Swimming at the 2005 World Aquatics Championships – Men's 100 metre butterfly
| Men's 100m Butterfly at the 2005 FINA World Aquatics Championships |
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| Dates | 29 July 2005 (heats, semifinals) 30 July 2005 (final) |
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| Winning time | 50.40 seconds | |||||||||
| Medalists | ||||||||||
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The Men's 100 Butterfly at the 2005 FINA World Aquatics Championships was swum 29 – 30 July 2005 in Montreal, Canada. Preliminary and Semifinals heats were held on 29 July, with the top-16 finishers from the Prelims in the mornings advancing to swim again in Semifinals that evening. The top-8 swimmers from the Semifinals then advanced to swim the race a third time in the Final the next evening (30 July).
This race consists of 2 lengths of butterfly, in the long course (50m) pool the event was swum in.
At the start of the event, the existing World (WR) and Championships (CR) records were:
The following records were established during the competition:
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