Derby

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Exercise rider William Delgado plays with Kentucky Derby hopeful California Chrome after a morning workout at Churchill Downs Wednesday, April 30, 2014, in Louisville, Ky. (AP Photo/Garry Jones)

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Exercise rider Benito Alvarado takes Kentucky Derby hopeful Uncle Sigh for a morning workout at Churchill Downs Tuesday, April 29, 2014, in Louisville, Ky. (AP Photo/Garry Jones)

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Hot walker Francisco Ugarte holds Kentucky Derby hopeful Wicked Strong after a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Garry Jones)

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Exercise rider Kelvin Pahal takes Kentucky Derby hopeful Wicked Strong for a morning workout at Churchill Downs Monday, April 28, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)

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In this image taken with a slow shutter speed, exercise rider Kelvin Pahal takes Kentucky Derby hopeful Wicked Strong for a morning workout at Churchill Downs Tuesday, April 29, 2014, in Louisville, Ky. (AP Photo/Morry Gash)