Secretariat, with jockey Ron Turcotte up, passed his rival, Sham, in the homestrech and ran away with the 99th Kentucky Derby in record time on May 5, 1973. Rumors swirled: he was injured, he lost a step during his 3-year-old season, he just wasn’t the superhorse everyone thought he was, his Wood rival Sham would be the true king of 1973. His rival Sham sat near the lead and made his move to catch the leader, Shecky Greene, at the top of the homestretch. Then, and only then, did Turcotte ask his horse for more, and Secretariat, like the finest of racecars, found another gear. Nearly half of the horses in Saturday’s Derby have Secretariat in their bloodlines.

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