World No.1 Novak Djokovic believes young Australian Nick Kyrgios can become one of the best tennis players in the world.
"Undoubtedly he has a great potential to be one of the world's best tennis players and I'm sure that he also has the intention and the ambition to achieve great heights in this sport," Djokovic told The Guardian Australia.
"He's got the talent, he's got the potential and he's got the strength and he's got all the arsenal of shots he needs and he's slowly getting all the pieces together.
"He still needs that routine and needs a certain level of professionalism and I would say, a kind of a sacrifice, you know, for something that [he wants] to achieve. It's all about give and take in life.
"It's important as well to keep the right balance. I don't think it's really healthy to just be living and breathing and dreaming tennis but also it's not good to be on the other extreme of not really caring too much and just going along and seeing how things turn out.
"It's important to find that optimal zone where you feel comfortable and you find that necessary balance in the middle where you know what works for you the best."
Kyrgios is the 29th seed at the Australian Open and has drawn Pablo Carreno Busta in the opening round.