Fastest swim long course 100 metres butterfly (male) According to Official Guinness Records,
Michael Phelps won the 100 m butterfly at the 2009 FINA World Championships in 49.82 seconds in Rome, Italy, on 1 August 2009. He became the first swimmer to break 50 seconds in the event. For a complete list of 2009 records, please visit 2009 Guinness Records in Italy .
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World record progression 100 metres ...
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