Rickie Fowler for me at 40-1, he played really well in the 3rd round last year in the bad weather but couldn't reproduce it on the Sunday. I think he has got a decent chance.
Also my big outsider is Andres Romero at 150-1. He has played well over the years in the Open, in fact he should have won in 2007 but blew it at the end. He's the type of player who can reel off 6 or 7 birdies in a row and he's also shown signs of a return to form this year.