While I personally think Jones will win (see UFC 145: 7 Reasons Jon Jones Will Crush Rashad Evans), Evans still has a chance. After all, if fans were sure of the outcome, they wouldn't even buy the pay-per-view.
It is easy to dismiss him, though. Jones has looked so dominant in every fight he has had up until now that it is hard to imagine him losing. Jones looks like a superhero in the ring, but every man looks invincible until he is beaten.
Rashad Evans could have Jones' number and there are a few good reasons fans could see him walk out of the cage in Atlanta with the title slung over his shoulder and a grin on his face.