Federer and Djokovic says, Nadal's a big threat again

Rafa Nadal will be pose a significant Grand slam threat again next year after showing signs of returning to his best, according to two of the Spaniard's greatest rivals.

After a crisis of confidence and form this year Spaniard Nadal slumped to 10th in the world rankings, but since a third-round defeat at the us open by Italian Fabio Fognini he has rediscovered his old spark.

"it is a fact that he has been playing better and he has been raising his level ever since US open, Djokovic told reporters after his victory over Tomas Berdych on Thursday.

"You can feel that he is starting to get comfortable on the court, starting to play better.”

"Maybe for his standard it's not the best season. What is he going to finish, top five? It's still a good season," said the Swiss.

"Everybody would take that except maybe a few players at this tournament. The rest would all love to be in his shoes."

"I think he's going to get stronger. With some time to practice and reassess his game, he's going to be tough to beat in Australia. I believe that."