FILE - In this Sunday, April 23, 2017 file photo, Oklahoma City Thunder guard Russell Westbrook (0) shoots between Houston Rockets guard Patrick Beverley, rear, and guard James Harden, right, in the fourth quarter of Game 4 of a first-round NBA basketball playoff series in Oklahoma City. Olympic swimmer Michael Phelps and Oklahoma City Thunder star Russell Westbrook are among the finalists for best male athlete at the ESPY Awards. Tennis star Serena Williams and gymnast Simone Biles are two of the finalists for best female athlete. (AP Photo/Sue Ogrocki, File)
Olympic champion Michael Phelps has announced his intention to retire after the London Olympics.