![Michael Phelps looks at the score board after winning the 100-meter butterfly in the at the Arena Grand Prix swim meet in Charlotte, N.C., Friday, May 16, 2014. Phelps won the race Michael Phelps looks at the score board after winning the 100-meter butterfly in the at the Arena Grand Prix swim meet in Charlotte, N.C., Friday, May 16, 2014. Phelps won the race](https://c8.alamy.com/comp/2N4TYEE/michael-phelps-looks-at-the-score-board-after-winning-the-100-meter-butterfly-in-the-at-the-arena-grand-prix-swim-meet-in-charlotte-nc-friday-may-16-2014-phelps-won-the-race-with-a-time-of-5213-ap-photonell-redmond-2N4TYEE.jpg)
Michael Phelps looks at the score board after winning the 100-meter butterfly in the at the Arena Grand Prix swim meet in Charlotte, N.C., Friday, May 16, 2014. Phelps won the race
![USA's Michael Phelps during a training session before the 12th FINA World Championships, at the Rod Laver Arena, in Melbourne, Australia, on March 23, 2007. Photo by Nicolas Gouhier/Cameleon/ABACAPRESS.COM Stock Photo - USA's Michael Phelps during a training session before the 12th FINA World Championships, at the Rod Laver Arena, in Melbourne, Australia, on March 23, 2007. Photo by Nicolas Gouhier/Cameleon/ABACAPRESS.COM Stock Photo -](https://c8.alamy.com/comp/2E749TM/usas-michael-phelps-during-a-training-session-before-the-12th-fina-world-championships-at-the-rod-laver-arena-in-melbourne-australia-on-march-23-2007-photo-by-nicolas-gouhiercameleonabacapresscom-2E749TM.jpg)
USA's Michael Phelps during a training session before the 12th FINA World Championships, at the Rod Laver Arena, in Melbourne, Australia, on March 23, 2007. Photo by Nicolas Gouhier/Cameleon/ABACAPRESS.COM Stock Photo -
![Santa Clara, CA. 21st June, 2015. Michael Phelps on deck at the start of the 200 Meter Butterfly heat #2 finals during the arena pro swim series at George F. Haines International Santa Clara, CA. 21st June, 2015. Michael Phelps on deck at the start of the 200 Meter Butterfly heat #2 finals during the arena pro swim series at George F. Haines International](https://c8.alamy.com/comp/EWA13E/santa-clara-ca-21st-june-2015-michael-phelps-on-deck-at-the-start-EWA13E.jpg)