Gregory Bull / AP
Jockey Aaron Gryder douses Calidoscopio with water after winning the Marathon horse race at the Breeders' Cup, Friday, Nov. 2, 2012, Arcadia, Calif.
Jeff Gross / Getty Images
Horses walk back to the stable after training in preparation for the 2012 Breeder's Cup at Santa Anita Park on October 31, 2012 in Arcadia, California.
Read more about Saturday's runners and riders in NBC Sports' preview of the top five Breeder's Cup storylines.
See more great sporting images in The Week in Sports Pictures.
Matt Sullivan / Reuters
Horses come around the bend in the Juvenile Fillies Turf race during the 2011 Breeders' Cup World Championship horse races at Churchill Downs in Louisville, Kentucky, November 4. Jockey John Velazquez aboard Stephanie's Kitten rides took first place in the race.
David J. Phillip / AP
Juan Leyva rides Musical Romance to victory during the Filly & Mare Sprint race at the Breeders' Cup horse races at Churchill Downs Friday, Nov. 4, in Louisville, Ky.