Keen Ice runs during morning training ahead of the Kentucky Derby at Churchill Downs in Louisville, Ky. Andy Lyons/Getty Images hide caption

itoggle caption Andy Lyons/Getty Images

The MGM Grand marquee is reflected in an escalator with advertising for the Mayweather Pacquiao fight, which will take place Saturday in Las Vegas. John Locher/AP hide caption

itoggle caption John Locher/AP