The Agua Caliente Racetrack is a greyhound racing and former horse racing track in Tijuana, Baja California, Mexico. It opened in December 1929 at a cost of $2.5 million.
One year before, the Agua Caliente Casino and Hotel opened in June 1928.
Like the resort, the racetrack was designed by Wayne McAllister and built by wealthy Americans Baron Long, a Los Angeles nightclub owner, Wirt Bowman, owner of the Tijuana gambling establishment, The Foreign Club, and James Croffroth, a member of the local Tijuana horseracing establishment. Some sources note the fourth partner was Abelardo L. Rodríguez, Military Commander and Governor of Baja California, and future President of Mexico. The lavish resort and racetrack on the Mexican border was popular among Americans, particularly Hollywood celebrities, because drinking, gambling and horse racing were still illegal in most of the neighboring U.S. states.
Although President Lázaro Cárdenas outlawed gambling in 1935 and closed the resort and casino, the Agua Caliente Racetrack continued to operate for many years. It was the site of several industry firsts, including starting gates, safety helmets, and “pick six” wagering. Both Phar Lap and Seabiscuit ran and won the Agua Caliente Handicap, which for a time was the richest in North America.
Such riders as Aureliano Noguez, Humberto Enriquez, Francisco Mena, Antonio Castanon and David Flores graced the jockeys' quarters throughout the days of horse racing.
The race track is the originator of the Pick 6 (on the North American continent). Then known as the 5-10 and later on the 4-9'er. Some racetrackers called it the Big Six.