In the Belmont, In the stretch, Secretariat opened a 1/16 mile lead on the rest of the field. At the finish, he won by 31 length, the fastest 1? miles on dirt in history, 2:24 flat, which broke the stakes record by more than 2 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 1? miles on dirt.