1973 Kentucky Derby entered the homestretch, Secretariat passed Sham in the final furlong and distanced himself to consolidate his lead. Secretariat would go on to win the Preakness Stakes and Belmont Stakes in the succeeding weeks, thus becoming the ninth horse to complete the Triple Crown of Thoroughbred Racing. Thirteen horses entered the Derby, which could have at most twenty participants. Horse owners had to pay a final entry fee of $2,500 to have their horses officially entered. The field was larger than anticipated because of new entries following Secretariat's loss at the Wood Memorial Stakes in New York. The Wood Memorial had
Belmont Stakes tradition is similar to the singing of the state song at the post parades of the first two Triple Crown races: "My Old Kentucky Home" at the Kentucky Derby and "Maryland, My Maryland" at the Preakness Stakes. The change of song gave rise to "the myth of Mamie O'Rourke," a reference to a character in the lyrics of "The Sidewalks of New York." Before American Pharoah won the Triple Crown in 2015, some claimed that changing the official Belmont song "cursed" the Triple Crown and was why no horse had won since Affirmed in 1978. Others note that there was