Juan Martin del Potro —
The good news is that Delpo has steadily regained the form he had when he won the 2009 US Open with stunning wins over Federer and Nadal. The bad news is that Delpo had to withdraw from the Rogers Cup in August because of the same wrist problems which have plagued him this decade. This gentle giant can beat anyone on a given day with his powerful serve and forehand, but lacks the speed to play effective defence. The 29yearold Argentine will be upset early this year.