PICTURES OF THE DAY

 Kentucky Derby entrant ArchArchArch is led to the track in preparation for the 137th Kentucky Derby at Churchill Downs on May 5, 2011 in Louisville, Kentucky. (Photo by Rob Carr/Getty Images)

Kentucky Derby entrant Dialed In is led around his stable by groom Roman Trujillo. (Photo by Jamie Squire/Getty Images)

 Dialed In with Carlos Correa waits to enter the track during the morning exercise session in preparation for the 137th Kentucky Derby. (Photo by Al Bello/Getty Images)

Trainer Bob Baffert leads his Kentucky Derby entrant Midnight Interlude to the track. (Photo by Rob Carr/Getty Images)

Kentucky Derby entrant Mucho Macho Man is walked after his morning workouts in preparation for the 137th running of the Kentucky Derby. (Photo by Jamie Squire/Getty Images)

 Kentucky Derby entrant Pants on Fire during morning workouts. (Photo by Jamie Squire/Getty Images)

A supply of horseshoes hang before the 137th Kentucky Derby at Churchill Downs on May 5, 2011 in Louisville, Kentucky. (Photo by Harry How/Getty Images)

Kentucky Derby entry Twinspired. (Photo by Jamie Squire/Getty Images)