When a jockey is so adept at his/her craft, that he/she will give a race horse every chance of winning regardless of the track conditions or the quality of the horse that they are riding.
A jockey considers it a very good compliment to receive.
"It doesn't matter that the horse in double figure odds. Joao Moreira is on board and he could ride a broomstick. Why do you think they call him "Magic Man"?