Photos by Charlie Riedel / AP
Chuck Kenney, from Goodells, Mich., places a bet before the 138th running of the Kentucky Oaks horse race at Churchill Downs, May 4, 2012, in Louisville, Ky.
Charlie Riedel / AP
Mallory McCallen, from Houston, Tx., reads through a race program before the running of the first race.
The Kentucky Oaks, sometimes called the little sister of the Kentucky Derby, is held at Churchill Downs on the Friday before the Kentucky Derby in Louisville, Ky. It features 3-year-old Thoroughbred fillies, and the race is 1 1/8 miles long. The Oaks and the Derby are the oldest continuously contested sporting events in history and are the only horse races that continue to be held in their original venue.