Nadal's end of 2015 was as good as it was during his prime. Name me 1 year, even 08, 10,13 (his best years) where he did better after USO than he did in 2015? You can argue that his run after USO was on par with how he has fared during this part of the season even in his prime. What does this tell us? That his level significantly improved towards end of the year. The Nadal that was losing on clay to nobodies at the beginning of 2015 would've gotten destroyed by Stan and Murray in EOY atp masters final, no doubt about that. He also wouldn't have made finals of China, finals of Basel (taking Roger to 3 sets in his hometown and best surface), competed so well in Shanghai and Paris. Rafa really did take his game to a much higher level towards end of 2015. This is a very good sign for him, i expect him to do very well at AO, play a level good enough to topple Federer, Stan and possibly Murray. Here's the problem now, Novak Djokovic. Barring injury, Rafa will have a strong 2016 but he will be at the mercy of Novak. If Novak is at his best, Rafael will have a tough time because Rafael simply cannot handle Novak at his best, even clay is not a safe haven.