Swimming at the 2003 World Aquatics Championships – Men's 100 metre backstroke
| Men's 100m Backstroke at the 2003 FINA World Aquatics Championships |
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| Dates | 21 July (prelims, semifinals) 22 July (final) |
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| Winning time | 53.61 seconds | |||||||||
| Medalists | ||||||||||
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The Men's 100 Backstroke event at the 10th FINA World Aquatics Championships swam 21 – 22 July 2003 in Barcelona, Spain. Preliminary and Semifinal heats swam on July 21; the Final was held on July 22.
At the start of the event, the existing World (WR) and Championship (CR) records were:
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