For a British Isles winner I would go Justin Rose. No-One has mentioned Sergio, is that because of his putting?
Augusta is a huge stretch, so naturally Driving Distance is a key statistic. Five of the previous six Masters winners have ranked in the top 40 for this stat, with Charl Schwartzel the only exception back in 2011. Greens in Regulation is of huge importance at August due to the tricky greens, not easy to scramble and score well. Eight of the last ten winners have ranked top ten for GIR. Assuming that meeting GIR on every single hole is nigh-on impossible, Scrambling becomes crucial. Six of the last eight champions have finished top ten for this stat, and three of the last four winners have topped the pile. So outside the world's top ten how about Alex Noren or Brooks Koepka?