Harrigan's Kid (1943)

Tom Harrigan raises orphaned Benny McNeil to be a first-rate jockey, but fails to bridle the lad's healthy ego. When Benny receives too many rebukes for unsportsman-like conduct from the racing commission, Tom decides to sell his contract to Garnet before he, too, is censured. Tom also reasons that, by having Benny with a top outfit, he can manipulate his races and make a fortune on the betting. But Benny, thanks to the humanizing influence of Mr. Garnet, has a different idea....