The problem with Murray is - you SAY he is in great shape, but when he starts losing, he will grab the back, or hip, or leg, or side. Don't know if those things really are bothering him - or it's just a nervous habit? But in that Wimbledon final, Murray looked more tired than Roger. And I can guarantee you that between Federer, Nadal, Novak, and ANY American - they would probably get the nod for a night match at the US Open over Murray.