Man O War won 20 of the 21 races ran just after WW1. He set two American records, 3 track records, and 3 world records. He also sired many track winning progeny who also won many races in turn.
Seattle Slew win 14 races
14 races
two(2) races
19/20 Races!
HE HAS WON 2 RACES.
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Man O' War won 20 races out of 21 starts.... he lost one race only because he was not even in the gate and he was facing backwards... but he almost won that one too..... still no other horse has a record that impressive!
Shergar won 6 races out of the 8 that he ran in.
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Richard Petty won 200 races in his career.
Jimmie Johnson won six races in 2010.