Nadal will win this match, but Wawa will take a set imo. Wawrinka is a beast and is 3-0 in grand slam finals, 1-0 against Nadal and 2-0 against Novak. I expect him to put up a big fight here. Of course I do not expect anyone to beat Nadal. He has not lost a set, as usual, all French, and should wrap this up in 4.
