Michael Phelps competes in the 100-meter butterfly during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. It is Phelps' first competitive event after a nearly two-year retirement. (AP Photo/Matt York)
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Michael Phelps competes in the 100-meter butterfly during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. It is Phelps' first competitive event after a nearly two-year retirement. (AP Photo/Matt York)
