Kentucky Derby

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The sun rises at Churchill Downs before the 143rd running of the Kentucky Derby horse race Saturday, May 6, 2017, in Louisville, Ky. (AP Photo/Garry Jones)

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Mario Gutierrez rides Nyquist to victory during the 142nd running of the Kentucky Derby horse race at Churchill Downs Saturday, May 7, 2016, in Louisville, Ky. (AP Photo/David J. Phillip)

CORRECTS LAST NAME TO GUTIERREZ FROM GUITIERREZ - Mario Gutierrez celebrates after riding Nyquist to victory during the 142nd running of the Kentucky Derby horse race at Churchill Downs Saturday, May 7, 2016, in Louisville, Ky. (AP Photo/Garry Jones)

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Kentucky Derby and Preakness Stakes winner American Pharoah is is schooled in the paddock, Thursday, June 4, 2015, in Elmont, N.Y. American Pharoah will try for the Triple Crown when he runs in Saturday's 147th running of the Belmont Stakes horse race. (AP Photo/Julie Jacobson)

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Exercise rider Jorge Alvarez gallops Kentucky Derby winner and Preakness Stakes favorite American Pharoah at Pimlico Race Course in Baltimore, Thursday, May 14, 2015. (AP Photo/Garry Jones)

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Victor Espinoza rides American Pharoah to victory in the 141st running of the Kentucky Derby horse race at Churchill Downs Saturday, May 2, 2015, in Louisville, Ky. (AP Photo/Tim Donnelly)

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Jason Dufner and his wife Amanda are seen at the 140th Kentucky Derby Saturday, May 3, 2014 in Louisville Ky. (Photo by Joe Imel/Invision/AP)

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Rain clouds roll past Belmont Park as an exercise rider takes a thoroughbred out for a workout in the track, Wednesday, June 4, 2014, in Elmont, N.Y. Kentucky Derby and Preakness Stakes winner California Chrome will attempt to become the first Triple Crown winner since Affirmed in 1978 when he races in the 146th running of the Belmont Stakes horse race on Saturday. (AP Photo/Julie Jacobson)

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Exercise rider Willie Delgado gallops California Chrome around the track during a workout at Belmont Park, Friday, June 6, 2014, in Elmont, N.Y. The Kentucky Derby and Preakness Stakes winner will attempt to become the first Triple Crown winner since Affirmed in 1978 when he races in the146th running of the Belmont Stakes horse race on Saturday. (AP Photo/Garry Jones)

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California Chrome takes a lap, with exercise rider Willie Delgado up, during a workout at Belmont Park, Friday, June 6, 2014, in Elmont, N.Y. The Kentucky Derby and Preakness Stakes winner will attempt to become the first Triple Crown winner since Affirmed in 1978 when he races in the 146th running of the Belmont Stakes horse race on Saturday. (AP Photo/Julie Jacobson)

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Smarty Jones horse racing fans applaud as the Kentucky Derby and Preakness winner returns to Philadelphia Park Racetrack, in Bensalem Pa., Sunday, June 6, 2004, after finishing second in the Belmont Stakes on Saturday. (AP Photo/Joseph Kaczmarek)

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ADVANCE FOR WEEKEND EDITIONS, JUNE 1-2 - FILE - In this May 3, 2014 file photo, Victor Espinoza rides California Chrome to victory during the 140th running of the Kentucky Derby horse race at Churchill Downs in Louisville, Ky. California Chrome's bid to become racing's first Triple Crown winner in 36 years isn't scaring away the competition. Horses are lining up to challenge the Kentucky Derby and Preakness winner in the Belmont Stakes next weekend. (AP Photo/David J. Phillip, File)

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FILE - This June 9, 1973 file photo shows Penny Chenery, owner of Secretariat, reacting after her horse won the Belmont Stakes, and the Triple Crown, at Belmont Park in Elmont, N.Y. Kentucky Derby and Preakness Stakes winner California Chrome is at Belmont Park in Elmont, N.Y., preparing for the final leg of the Triple Crown. (AP Photo/Jack Kanthal, File)

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FILE - In this June 9, 2012 file photo, retired jockey Ron Turcotte, left, who rode Secretariat to the Triple Crown in 1973, poses for photos with Kenny Foudy, 5, next to a statue of the race horse prior to the Belmont Stakes at Belmont Park in Elmont, N.Y. Kentucky Derby and Preakness Stakes winner California Chrome is preparing for the final leg of the Triple Crown, the Belmont Stakes, on June 7, 2014. (AP Photo/Mark Lennihan, File)

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FILE - In this June 9, 1973 file photo, jockey Ron Turcotte walks Secretariat towards the winners circle after they captured the Triple Crown by winning the Belmont Stakes at Belmont Park in Elmont, N.Y. Kentucky Derby and Preakness Stakes winner California Chrome will try to win the Triple Crown on June 7, 2014 at Belmont Park. (AP Photo/File)