The Contenders at the Kentucky Derby

May 4: Exercise rider Louie Feliciano takes Kentucky Derby hopeful Watch Me Go for a workout at Churchill Downs in Louisville, Ky. Watch Me Go comes from a low-profile family and entered the Derby picture with an upset victory in the Tampa Bay Derby. (AP)

May 4: Exercise rider Hector Ramos takes Kentucky Derby hopeful Uncle Mo for a workout at Churchill Downs in Louisville, Ky. Uncle Mo is one of the top horses in the Derby Field. It placed third at the Wood Memorial last month. (AP)

May 4: Exercise rider Derrick Smith takes Kentucky Derby hopeful Twinspired for a workout at Churchill Downs in Louisville, Ky. Twinspired comes into the Derby after placing second at the Toyota Blue Grass race last month. Twinspired has raced its best races on synthetic tracks. (AP)

May 4: Exercise rider Nate Quinonez takes Kentucky Derby hopeful Twice the Appeal for a workout at Churchill Downs in Louisville, Ky. Kentucky Derby winning jockey Calvin Borel will be riding the horse who comes into the race after finishing first at the Sunland Derby in March. (AP)

March 5: In this photo released by the New York Racing Association, Stay Thirsty, with Ramon A. Dominguez aboard, captures The Gotham Grade III horse race at Aqueduct in New York. Despite finishing first at Gotham, Stay Thirsty comes into the Derby after placing a disappointing seventh at the Florida Derby. (AP)

May 4: Exercise rider Danny Wright takes Kentucky Derby hopeful Soldat for a workout at Churchill Downs in Louisville, Ky. Soldat comes into the Derby after finishing fifth at last months Florida Derby. Alan Garcia, who was the jockey on the winning horse Da'Tara during the 2008 Belmont Stakes, will guide Soldat. (AP)

May 4: Exercise rider Faustino Ramos takes Kentucky Derby hopeful Shackleford for a workout at Churchill Downs in Louisville, Ky. Shackleford comes into the Derby after placing second at the Florida Derby last month. Jockey Jesus Castanon will be making his Derby debut riding Shackleford. (AP2011)

May 4: Exercise rider Brendan Walsh takes Kentucky Derby hopeful Santiva for a workout at Churchill Downs in Louisville, Ky. Santiva comes into the Derby after placing ninth at the Toyota Blue Grass race last month. Before that, it finished second at the Risen Star race in February. (AP)

May 4: Kentucky Derby hopeful Nehro gets sponged down after a morning workout at Churchill Downs in Louisville, Ky. Nehro has had two strong races coming into the Derby. It finished second at both the Arkansas Derby and the Louisiana Derby. (AP)

May 3: Exercise rider Mike Heera takes Kentucky Derby hopeful Mucho Macho Man for a workout at Churchill Downs in Louisville, Ky. Mucho Macho Man comes into the Derby after placing third in the Louisiana Derby in March and winning the Risen Star race in February. (AP2011)

April 30: Exercise rider Dana Barnes rides Kentucky Derby hopeful Midnight Interlude through a morning exercise at Churchill Downs in Louisville, Ky. Racing Hall of Fame trainer Bob Baffert leads Midnight Interlude into the Derby. The horse finished first in last months Santa Anita Derby and will be ridden by Derby-winning jockey Victor Espinoza. (AP2011)

Master of Hounds comes into the Kentucky Derby after finishing sixth last November in the Breeders' Cup Juvenile Turf. Jockey Garrett Gomez will be hoping to lead Master of Hounds to the winner's circle at the Derby. (AP)

May 4: Exercise rider Carlos Correa takes Kentucky Derby hopeful Dialed In for a workout at Churchill Downs in Louisville, Ky. Hall of Fame racing trainer Nick Zito leads Dialed In into the Derby. The horse is coming off consecutive wins at the Florida Derby and the Holy Bull. (AP)

May 2: Kentucky Derby hopeful Decisive Moment is exercised on the Churchill Downs track by trainer Juan Arias in Louisville, Ky. Decisive Moment comes into the Derby after placing second in consecutive races at the Vinery Racing Spiral and the Delta Jackpot. (AP2011)

Dec. 18, 2010: In a photo provided by Benoit Photo, jockey Corey Nakatani celebrates after Comma To The Top won the Grade I, $750,000 CashCall Futurity horse raceat Hollywood Park in Inglewood, Calif. Comma to the Top comes into the Derby after finishing second at the Santa Anita Derby last month. (AP)

May 4: Jockey Jon Court takes Kentucky Derby hopeful Archarcharch for a workout at Churchill Downs in Louisville, Ky. Archarcharch comes into the Derby on a roll after finishing first in the Arkansas Derby and Southwest race and third in the Rebel race. (AP)

April 30: Assistant trainer Dan Blacker pulls against Kentucky Derby hopeful Brilliant Speed during a morning exercise at Churchill Downs in Louisville, Ky. Brilliant Speed comes into Saturday's Kentucky Derby after finishing first at the Toyota Blue Grass race last month. (AP)

May 4: Exercise rider James Slater takes Kentucky Derby hopeful Animal Kingdom for a workout at Churchill Downs in Louisville, Ky. Animal Kingdom is coming off a first place finish at the Vinery Racing Spiral in March. (AP)

May 1: Kentucky Derby hopeful Pants On Fire, ridden by jockey Rosie Napravnik, is exercised on the Churchill Downs track in Louisville, Ky. Pants on Fire is coming into Saturday's Derby on a roll after finishing first at the Louisiana Derby and placing second at the Lecomte race. (AP)