LONDON, ENGLAND - AUGUST 05: 22 time Olympic medalist Michael Phelps talks with Kevin Burke, CMO of Core Products for Visa Inc., during a press conference presented by Visa at the London Media Centre... more 
LONDON, ENGLAND - AUGUST 05: 22 time Olympic medalist Michael Phelps talks with Kevin Burke, CMO of Core Products for Visa Inc., during a press conference presented by Visa at the London Media Centre on August 5, 2012 in London, England. (Photo by Chris Graythen/Getty Images for Visa) less 
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Getty Images | Photo By Chris Graythen / Getty Images for Visa
Sun, Aug 5, 2012 5:57 PM EDT