Records fall in women's 100 fly semifinals; Magnuson gets AR

Reigning NCAA 100-yard butterfly champion Christine Magnuson of Tennessee took down Natalie Coughlin's American record in the 100-meter butterfly Sunday in the semifinals en route to qualifying second for the championship heat behind Australia's Libby Trickett (57.05 seconds).

Magnuson clocked 57.08, lowering Coughlin's mark of 57.34 set last March at the FINA World Championships in Melbourne, Australia.

Singapore's Tao Li produced an Asian record of 57.54 to qualify fourth, just behind Australia's Jessicah Schipper -- the 200 butterfly world-record holder -- who clocked 57.43.

Stanford's Elaine Breeden clocked 58.55 and missed qualifying for the championship heat.