[Horses round the first turn during the 140th running of the Kentucky Derby horse race at Churchill Downs on Saturday. AP Photo/Matt Slocum.]

[Exercise rider William Delgado takes Kentucky Derby entrant California Chrome for a morning workout during a morning workout at Churchill Downs on Friday. AP Photo/Charlie Riedel.]

[Jockey Victor Espinoza rides California Chrome to win in the 140th running of the Kentucky Derby horse race at Churchill Downs on Saturday. AP Photo/Matt Slocum.]

[Ashley Cebak and Tami Purcell wear hats before the 140th running of the Kentucky Derby horse race at Churchill Downs on Saturday. AP Photo/David Goldman.]

[Exercise rider Abel Flores takes Kentucky Derby hopeful Tapiture for a morning workout in the rain at Churchill Downs on Monday. AP Photo/Garry Jones.]

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[Victor Espinoza rides California Chrome to victory during the 140th running of the Kentucky Derby horse race at Churchill Downs on Saturday. AP Photo/David J. Phillip.]