2015 Kentucky Derby the lead in the homestretch. The race marked the fourth Kentucky Derby win for horse trainer Bob Baffert and the third win for Espinoza. The Kentucky Derby is a race for 3-year-old Thoroughbred horses. The 2015 field was determined by a points system that was introduced in 2013. The post position draw of the entries for the Kentucky Derby was held on Wednesday, April 29, 2015, at the Churchill Downs Racetrack clubhouse. American Pharoah was installed as the 5-2 morning line favorite. The day after the draw, Todd Pletcher scratched Stanford, stating that the horse was "fine" but they were
American Champion Three-Year-Old Filly American Champion Three-Year-Old Filly The American Champion Three-Year-Old Filly is an American Thoroughbred horse racing honor awarded annually to a female horse in Thoroughbred flat racing. It became part of the Eclipse Awards program in 1971. The award originated in 1936 when both the "Daily Racing Form" (DRF) and Turf and Sports Digest (TSD) magazine began naming an annual champion. Starting in 1950, the Thoroughbred Racing Associations (TRA) began naming its own champion. The following list provides the name of the horses chosen by these organizations. There were several disagreements, with more than one champion being recognized on five occasions.