What was Seabiscuits winning percentage?

Answer 1

Of his 89 lifetime starts, 33 where firsts, 15 seconds and 13 thirds. His percentage of wins was %37.07. The most amazing thing about Seabiscuit was most of his wins came at an age when most of his contemporaries had already been retired to stud. The only horse that comes close is the legendary John Henry who was finally retired at the age of 11.*

*John Henry, like Seabiscuit had a bad temperment, and was gelded at some point in his career. It did little to alter his bad attitude but did not effect his ability to win, only his ability to sire future champions. It is rare for male racehorses to be gelded if they win. The big money is not in purse money but future stud fees.