The 2015 Breeders' Cup World Championships was the 32nd edition of the thoroughbred horse racing season-ending premier event held on October 30 and 31 at Keeneland in Lexington, Kentucky.

[1] The race series, held for the first time at Keeneland, required a significant amount of preparation to transform the small, historic track into a venue capable of handling large crowds, comprising 13 championship races held over a two-day period.

Thirty-nine horses entered in the Breeders' Cup races qualified via the challenge series, including six of the winners.

Returning the track to a dirt surface was a significant factor in Keeneland's bid to host the Breeders' Cup in 2015.

A track built in 1935 as "a model race track, to perpetuate racing in the proper manner", it had never handled crowds of the size anticipated for the Breeders' Cup and thousands of temporary seats had to be added without removing trees or otherwise changing the classic appearance of the facility.

They created seating in buildings adjacent to the existing grandstands and set up large tents and other temporary facilities, plus two tailgate areas with big-screen televisions for additional spectators.

To get the proper distance while maximizing the run-up to the first turn, the starting gate was set 70 yards (64 m) in front of the one-mile pole, where the timer would start, and the finishing line was set at the track's alternate finish line at the 1⁄16 mile pole, thus the race was slightly longer than a mile for the horses.

The most-anticipated race on Friday was the Breeders' Cup Distaff for fillies and mares, won by the four-year-old campaigner, Stopchargingmaria.