Trainer D. Wayne Lukas walks with Kentucky Derby entrant Oxbow and jockey Gary Stevens before a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel)

Associated Press
Trainer D. Wayne Lukas walks with Kentucky Derby entrant Oxbow and jockey Gary Stevens before a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel)
Trainer D. Wayne Lukas walks with Kentucky Derby entrant Oxbow and jockey Gary Stevens before a workout at Churchill Downs Monday, April 29, 2013, in Louisville, Ky. (AP Photo/Charlie Riedel)
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