I dont see Westwood competing, his short game just is not good enough.
Of the Europeans, Donald will have to have a really good few days with his wedges, as the longer hitters will pull away on the Par 5s unless he's making single putt birdies. It is possible though, I think it was Zach Johnson who layed up on all the Par 5s.
For me, I reckon the following will go well: Phil, Tiger, Rory, Watney, Bradley. I know, I know, not exactly long shots, but I dont think Rose (poor putter) or Luke (just a hunch) will win. Long shots for me are: Johnson & Snedeker.