Rafael Nadal insists he is unfazed about potentially winning his 20th grand slam title at the Australian Open.

The world number one started his campaign in Melbourne with a 6-2 6-3 6-0 victory over Hugo Dellien on Tuesday.

After winning two grand slams last year, Nadal is just one away from joining Roger Federer on a men's record 20 major titles.

But the Spaniard is refusing to think about potentially reaching the tally ahead of a second-round match with Federico Delbonis or Joao Sousa.

"No. I think about Sousa or Delbonis. That's all. I think about my practice of tomorrow, try to follow up the level of tennis that I played in the third set. That should be my main goal today," Nadal told a news conference.

"I need to play at my highest level if I want to keep going in the tournament. If I am able to reach my highest level, that's the thing that I have to worry about. If I am able to play at my highest level, normally I am able to produce some good chances. If not, impossible.

"I don't care about 20 or 15 or 16. I just care about try to keep going, keep enjoying my tennis career. It's not like 20 is the number that I need to reach. If I reach 20, fantastic. If I reach 21, better. If I reach 19, super happy about all the things that I did in my tennis career.

"I am very satisfied about my tennis career because I give it all most of the time. That's the only thing that matters because, honestly, it's something I don't really think about.

"I don't think in the future achieving 21 grand slams, for example, I'm going to be happier than if I am 19 in 10 years. I won the US Open a few months ago, and I was super happy in that moment. But today I'm happier than if I didn't win the US Open? Probably not. That's the only thing that matters in this life.

"Of course, I want to do it the best way possible because that's what I am doing since the beginning of my life almost. But the only thing I can do is put all my efforts in trying to keep going the best way possible. The rest of the things, the future will see."