I know that if I get myself to desired level of performance - mental and physical - that I can actually have a good chance to go far in the tournament.
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.
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.
"I think previous year there were periods where I was really good and really bad", he told reporters at Melbourne Park on Saturday. "I do feel young inside, you know".
It saw Nadal play Austrian world number five Dominic Thiem this week on a practice court under full match conditions, with ball kids, scoreboard, and umpire.
"We'll have to keep working on that because in my career there are two vital things, the serve and the return, where I start the point and where I have to attack so I don't have to run more than I need to".
"After long, very thorough consultations with my team and doctors, we have made the decision that it is fine and adequate to play", he added.
Nadal, Federer seeded 1st and 2nd for Australian Open
The six-time Australian Open victor enlisted the help of tennis great Andre Agassi and power hitter Andy Roddick, to find a way to help release the "load from the elbow". "The job was done the right way".
If he wins Australian Open, it will be his 17th grand slam and will also put him in an elite list of few players who have won all the Grand Slams at least twice in their career.
The only place he is yet to achieve the double is Australia.
"For me the Australian Open, if you are not 100 percent motivated to win this tournament, you probably don't love the sport".
But he knows anything can happen so early in the season, despite being the top ranked player in the world. But, still, "everyone starts from zero. Here we are to try my best, try to see if I am able to start".
It has been an encouraging start for Kyrgios, who has always struggled to control his emotions while wielding one of the most devastating games on the ATP Tour.
"But hopefully I can improve that this year".
Spain's Rafael Nadal talks with his coach Carlos Moya during a practice session ahead of the Australian Open tennis tournament.