Swimming-Phelps storms back for record and 100 butterfly gold ROME, Aug 1 (Reuters) - Michael Phelps produced a stunning comeback to break the world record and retain his 100 metres butterfly world title on Saturday. The American swam 49.82 seconds to knock previous record holder Milorad Cavic of Serbia into second. Cavic had broken Phelps WR in the 100 butterfly the previous day in the semis with a time of 50.01 http://sports.espn.go.com/oly/swimming/news/story?id=4371012&campaign=rss&source=ESPNHeadlines