The Dark Horse(2008)

Gambling addict Neil Davis' life hits rock bottom after being arrested for purse-snatching and being rejected by his family. Out of desperation, he decides to bet the little money he has left on a horse race. On race day, a conversation with a stranger convinces Neil to bet his last money on a long-shot horse. Will Neil, an underdog himself, succeed in betting against all odds? One way or another, this is going to be a life-changing day for him.