Jockey Gary Stevens rides Kentucky Derby entrant Oxbow for a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Morry Gash)

Associated Press
Jockey Gary Stevens rides Kentucky Derby entrant Oxbow for a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Morry Gash)
Jockey Gary Stevens rides Kentucky Derby entrant Oxbow for a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Morry Gash)
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