This Day in History: 1973-06-09

Secretariat won the Belmont Stakes by 31 lengths—the longest winning margin in the race’s history—while setting a track record of 2:24, which has not been surpassed. The time was 2 3/5 seconds faster than the mark set by Gallant Man in 1957. Secretariat’s victory made him the ninth Triple Crown winner and first since Citation had swept the Derby, Preakness and Belmont in 1948.