Kei Nishikori vs. Milos Raonic
This is sort of like George Foreman vs. Floyd Mayweather. One player hits heavy shots and blasts away with punishing power generated by a powerful frame. The other player generates power through exquisite timing. In a boxing match, I would take Foreman over Mayweather because no one in boxing can give up that much weight and beat a fighter who knows what he is doing. Fortunately for Nishikori, he does not have to fight Raonic. He gets to play tennis.
My Prediction: Kei Nishikori d. Milos Raonic 6-4, 6-7, 6-2.