Michael Phelps

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Michael Phelps competes in the 100-meter butterfly final during the Arena Grand Prix swim meet, Thursday, April 24, 2014, in Mesa, Ariz. Ryan Lochte won, and Phelps finished in second place. He was competing for the first time since the 2012 London Olympics. (AP Photo/Matt York)

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Michael Phelps listens to music prior to competing in the 100-meter butterfly during the Arena Grand Prix swim meet, 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)

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Michael Phelps competes in the 100-meter butterfly final during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. Ryan Lochte won, and Phelps finished in second place. He was competing for the first time since the 2012 London Olympics. (AP Photo/Matt York)

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Michael Phelps, left, congratulates Ryan Lochte on Lochte's win in the 100-meter butterfly final during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. Phelps was competing for the first time since the 2012 London Olympics. (AP Photo/Matt York)

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Ryan Lochte competes in the 100-meter butterfly final during the Arena Grand Prix swim meet, Thursday, April 24, 2014, in Mesa, Ariz. Lochte won, and Michael Phelps finished in second place. Phelps was competing for the first time since the 2012 London Olympics. (AP Photo/Matt York)

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Michael Phelps looks toward fans after competing in the 100-meter butterfly final during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. Phelps was competing for the first time since the 2012 London Olympics. He finished second in the final. (AP Photo/Matt York)

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Michael Phelps competes in the 100-meter butterfly final during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. Phelps was competing for the first time since the 2012 London Olympics. He finished second in the event. (AP Photo/Matt York)

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Michael Phelps, left, and Ryan Lochte look toward the crowd after competing in the 100-meter butterfly final during the Arena Grand Prix, Thursday, April 24, 2014, in Mesa, Ariz. Phelps was competing for the first time since the 2012 London Olympics. Lochte finished first and Phelps finished second in the final. (AP Photo/Matt York)

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Michael Phelps, right, and Ryan Lochte pose for a photo after competing in the 100-meter butterfly final during the Arena Grand Prix swim meet, Thursday, April 24, 2014, in Mesa, Ariz. It is Phelps' first competitive event after a nearly two-year retirement. Lochte finished first and Phelps finished second. (AP Photo/Matt York)