Like Federer, Nadal has pared back his playing schedule to prolong his career but the strain still showed when he pulled out of the ATP Tour Finals in November with a knee problem after losing his opening match.
It forced him to skip the lead-up Brisbane International this month, and he has only had a one-match workout at the exhibition Kooyong Classic in Melbourne ahead of the Grand Slam starting Monday.
"I'm hoping that it can be 100 percent at the start of the tournament".
Federer was coming off an extended injury break and was seeded 17th at last year's Australian Open when he beat Nadal, who was seeded ninth, in five sets in the final.
"Until it's done, I don't want to have any (sixth) sense, to be honest", the Bulgarian told reporters in Melbourne on Saturday.
Dimitrov said he's a better player than he was when he lost the semifinal here past year to Nadal, and Zverev is aiming to go deep into the second week for the first time at a major.
The grand slam starts on January 15.
Even with Murray and Novak Djokovic out of the frame for much of 2017 due to injury, "Gen Next" once again failed to make inroads at the four tournaments that really count.
"The correction and improvements to the serve are allowing me to be more efficient and spend less energy", he said.
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"I feel that I had a good week and a half of practice".
The 2008 champion and current world No. 47 kicks off her campaign against a player ranked one place higher, Germany's Tatjana Maria.
Britain's sole representative Kyle Edmund will face big-serving US Open runner-up Kevin Anderson in the first round.
"For me, the Australian Open always, if you are not enough motivated, 100 per cent motivated to play this tournament, probably you don't love this sport", Nadal said.
"Everyone starts from zero".
"I'm happy with the way that I am working with (coaches) Carlos (Moya), with Francis (Roig) and the rest of my team". I still have this afternoon and tomorrow, the last practice before the competition starts for me.
Toni is now focusing on Nadal's tennis academy, perhaps getting back to what he enjoys the most - nourishing young talent.
"In terms of professional things, I spoke to him few days ago, speaking about how the life going, how the tennis going", he said of Toni.