I'm thinking Justin Rose because he's played really well the past five Masters without a win and I think he's running 18-1 with the bookies.
I know there are several folks here who will swear that he stopped using steroids (which they claimed he was on) but the reality is that the muscle development workouts and intensity that he subjected himself to were quite likely one of the causes of the decline in his golf game. Realizing that, he probably backed off from that regimen.....
Golf is a finesse sport, not a body building sport. Also notice that Mickelson has seemed to have trimmed down a lot..........And Couples too......
Weight lifting in golf is only for maintaining existing strength and muscle tone, not for building........