Kentucky Derby

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Joel Rosario rides Orb during the 139th Kentucky Derby at Churchill Downs Saturday, May 4, 2013, in Louisville, Ky. (AP Photo/David Goldman)

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Horses run around a muddy track during the ninth race before the 139th Kentucky Derby at Churchill Downs Saturday, May 4, 2013, in Louisville, Ky. (AP Photo/J. David Ake)

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Exercise rider Victor Lebron rides Kentucky Derby hopeful Frac Daddy for a workout at Churchill Downs in Louisville, Ky., on April 30, 2013. (Associated Press)

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Trainer Todd Pletcher talks about his five potential Kentucky Derby entrants during a morning news conference at Churchill Downs Saturday, April 27, 2013 in Louisville, Ky. (AP Photo/Garry Jones)

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Kentucky Derby and Preakness winner I'll Have Another stands with trainer Doug O'Neill during a news conference at Belmont Park in Elmont, N.Y., on Friday, June 8, 2012. I'll Have Another's bid for a Triple Crown ended with the shocking news that the colt was out of the Belmont Stakes due to a swollen left front tendon. (AP Photo/Matt Slocum)

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Jack Sisterson, right, assistant trainer for Kentucky Derby and Preakness winner I'll Have Another, hugs trainer Doug O'Neill after a news conference at Belmont Park in Elmont, N.Y., on Friday, June 8, 2012. I'll Have Another's bid for a Triple Crown ended with the shocking news that the colt was out of the Belmont Stakes due to a swollen left front tendon. The Belmont Stakes is Saturday. (AP Photo/Patrick Semansky)

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Kentucky Derby and Preakness winner I'll Have Another stands June 8, 2012, with trainer Doug O'Neill during a news conference at Belmont Park in Elmont, N.Y. I'll Have Another's bid for a Triple Crown ended with the shocking news that the colt was out of the Belmont Stakes the following day due to a swollen left front tendon. (Associated Press)

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Mario Gutierrez, left, jockey for Kentucky Derby and Preakness winner I'll Have Another, talks with Doug O'Neill, the horse's trainer, before a news conference, in New York, Tuesday, June 5, 2012. I'll Have Another could become horse racing's 12th Triple Crown winner and the first in 34 years on Saturday in the Belmont Stakes.(AP Photo/Richard Drew)

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In this image provided by the New York Racing Association (NYRA), Kentucky Derby and Preakness Stakes winner I’ll Have Another, ridden by exercise rider Jonny Garcia, gallops at Belmont Park, Thursday, May 31, 2012 in Elmont, N.Y. (AP Photo/NYRA)