Micheal Phelps chases final gold at Rio
Michael Phelps swims in the men's 100-meter butterfly semifinal at the US Olympic swimming trials, Friday, July 1, 2016, in Omaha.
Micheal Phelps chases final gold at Rio
Michael Phelps dives at the start of the men's 100-meter butterfly final at the U.S. Olympic swimming trials.
Micheal Phelps chases final gold at Rio
Michael Phelps starts the men's 100-meter backstroke final at the US nationals of swimming, on Aug 9, 2014, in Irvine, California. Phelps finished sixth in the event.
Phelps chases final gold at Rio
Michael Phelps, foreground, dives into the pool during the men's 50-meter freestyle preliminaries at the Arena Grand Prix swim meet on April 25, 2014, in Mesa, Arizona.
Micheal Phelps chases final gold at Rio
Michael Phelps of the US holds up his men's 100m butterfly gold medal at the Pan Pacific swimming championships in Gold Coast, Australia. USA Swimming on Oct 6, 2014, suspended Phelps for six months as a result of the Olympic champion's second DUI arrest.
Micheal Phelps chases final gold at Rio
Michael Phelps displays his gold medal for the men's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. Phelps is coming out of retirement, the first step toward possibly swimming at the 2016 Rio Olympics.
Micheal Phelps chases final gold at Rio
Michael Phelps holds up his Laureus Academy Exceptional Achievement trophy as he poses for pictures during the Laureus World Sports Awards in Rio de Janeiro, on March 11, 2013.