Rafa's level was up and down at the Australian Open and it cost him.
bad back did not help his cause obviously. he could have fought better in the final but he could not. he did all he could.
its the lack of optimal preparation that cost him in my estimation.
he needs work in some areas in my opinion:
1. he needs better fitness
2. he needs to work on his return of serve
3. and he needs some work on his serve.
he took out roger in straights and he also had no 5 setters going into the final. I believe the lack of optimal fitness led to that back injury.
he is involved in way too may outside activities after the u.s. open. I think that was a factor.
he knew what was at stake at the Australian Open. now he is in a race against time. he will be 29 this year.
I think he let one slip away. he was 12-0 against stan and he just finished beating him in London. this is not the match anybody picked stan to win.
nadal's fitness levels let him down. his fitness levels and his lack of optimal preparation worked against him.
that is my own opinion anyway.