Secretariat Wins The Triple Crown

June 9, 1973:

Only four horses competed against Secretariat for the June 9, 1973, running of the Belmont Stakes, including Sham, who had finished second in both the Derby and Preakness, along with three other horses thought to have little chance by the bettors: Twice A Prince, My Gallant, and Private Smiles. With so few horses in the race, and with Secretariat expected to win, no "show" bets were taken. Secretariat was sent off as a 1–10 favorite to win as a $2.20 payout on a $2 ticket and paid at 20 cents more – $2.40 – to place. Before a crowd of 67,605, Secretariat and Sham set a fast early pace, opening ten lengths on the rest of the field. After the six-furlong mark, Sham began to tire, ultimately finishing last. Secretariat astonished spectators by continuing the fast pace and opening up a larger and larger margin on the field. Viewers heard the wonder in CBS Television announcer Chic Anderson's voice as he described the horse's pace: "Secretariat is widening now! He is moving like a tremendous machine!"
In the stretch, Secretariat opened a 1/16 mile lead on the rest of the field. At the finish, he won by 31 lengths (breaking the margin-of-victory record set by Triple Crown winner Count Fleet in 1943, who won by 25 lengths), and ran the fastest 1½ miles on dirt in history, 2:24 flat, which broke the stakes' record by more than two seconds. This works out to a speed of 37.5 mph for his entire performance. Secretariat's world record still stands, and in fact, no other horse has ever broken 2:25 for 1½ miles on dirt. If the Beyer Speed Figure calculation had been developed during that time, Andrew Beyer calculated that Secretariat would have earned a figure of 139, the highest he has ever assigned. Many bettors holding 5,617 winning parimutuel tickets on Secretariat never redeemed them, presumably keeping them as souvenirs (and because they paid only $2.20 on a $2 bet).
Secretariat became the ninth Triple Crown winner in history, and the first in 25 years.

It would have been good for the sport to have I'll Have Another running for the Triple Crown 39 years to the day after Secretariat put in the greatest racing performance of all time.  Video of Secretariat's win in the Belmont is here.