Tyler Clary swims the butterlfy during the men's 400 meter individual medley at the U.S. nationals of swimming, Friday, Aug. 8, 2014, in Irvine, Calif. Clary won the event. (AP Photo/Mark J. Terrill)IRVINE, California (AP) — Tom Shields upset three-time Olympic champion Michael Phelps through a hundredth of a second to win the a hundred-meter butterfly on the U.S. nationwide championships on Friday.