Melatonin lives up to expectations in winning the Santa Anita Handicap

It really shouldn't have surprised anyone that longshot Melatonin won the $1-million Santa Anita Handicap on Saturday. A look at horse racing's sabermetrics — past performances — made a very compelling case.

He had raced twice over the dirt at Santa Anita and won both times by a combined 7 1/4...