Will Nadal's fatigue affect his stint as world no. 1?

Tweet

Ok, so I've been reading articles about fatigue being one of the primary factors that led to Nadal's loss in the semi-finals of the U.S. Open. Of course, by the way he had been playing these past few months and with the physicality of his style of play, it really is a wonder that he had actually gotten that far without giving in to fatigue. Now, he's again representing his country in the Davis Cup and his camp has admitted that, though he has not yet fully recovered from the strain of playing around 100 matches in the span of three months, he's better than he was a couple of weeks ago. It makes me wonder though. Would Nadal be able to recover in time for the Masters Cup in Shanghai? Of course, it's a good thing he hasn't had any serious injury in a while but even mentally-tough players like him eventually give in to the physical strain of the sport. I think that Nadal needs a break. Hopefully, by November, he'd be back in tip-top shape. After all, it seems like the Great Fed is once again breathing down his neck. So, what do you think? Will Nadal lose his no. 1 spot to fatigue? Or will he be able to bounce back and recover like the resilient champion that he is?