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Topic - Arena Grand Prix

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Michael Phelps leaps at the start of a 50-meter freestyle preliminary heat during the Arena Grand Prix swim event, Friday, April 25, 2014, in Mesa, Ariz. It is Phelps' second competitive event after a nearly two-year retirement. (AP Photo/Matt York)

Phelps uses 50 free to perfect his butterfly

By BETH HARRIS - Associated Press

** FILE ** United States' Michael Phelps swims in the men's 4 X 100-meter medley relay at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. (AP Photo/Julio Cortez)

Olympic great Michael Phelps ending retirement

By Beth Harris - Associated Press