100 Metres Butterfly World Record Set On this day, in 2009 Michael Phelps sets world record in the 100 metres butterfly swimming event at the World Championships in Rome, Italy. August 1, 2009 Sport: Swimming Trivia Which Nations Won the Gold, Silver and Bronze Medals the Last Time Baseball Was an Olympic Sport? What Are the Five Events That Make Up the Modern Olympic Pentathon? sports in this article Swimming tags in this article Fan On This Day SportsEngine