Exercise rider Joel Barrientos takes Kentucky Derby entrant General a Rod for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Exercise rider Nick Bush takes Kentucky Derby entrant We Miss Artie for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)
Exercise rider Simon Paine takes Kentucky Derby entrant Samraat for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)
Exercise rider William Delgado takes Kentucky Derby entrant California Chrome for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Exercise rider Ezequiel Perez takes Kentucky Derby entrant Danza for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Exercise rider Joel Barrientos takes Kentucky Derby entrant Vicar's in Trouble for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Exercise rider William Delgado takes Kentucky Derby entrant California Chrome for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Exercise rider Joel Barrientos takes Kentucky Derby entrant General a Rod for a morning workout during a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Morry Gash)
Frank Compton watches as Kentucky Derby entrant Ride On Curlin eats after a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/David Goldman)
Trainer Gary Contessa pets Kentucky Derby entrant Uncle Sigh as they school in the paddock at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Garry Jones)
Kentucky Derby entrant Wicked Strong is walked after a morning workout at Churchill Downs Friday, May 2, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)