Rafael Nadal said he did not feel he had "equal conditions" during his Australian Open campaign, which came to a halt on Tuesday.

Nadal was roundly thrashed for two sets before putting up some resistance in the third set, only for long-time whipping boy Tomas Berdych to break his winning drought against the Spaniard 6-2 6-0 7-6 (7-5) on Rod Laver Arena.

The Melbourne Park major was Nadal's fifth official tournament since Wimbledon, as he underwent treatment on his back in the second half of 2014.

The Mallorcan conceded he was not at 100 per cent, and needs to regain confidence in his 28-year-old body.

"I have to take the positive things. Without being at my top level of tennis I was able to be here in quarter-finals," Nadal told a news conference.

"[It] is not a bad result at all for me arriving here the way I arrived: only with one match [this season], only with five matches in seven months.

"So taking the positive part, that's the thing that I have to take.

"That's just the beginning of the season, and I want to keep having chances to compete well against everybody. I need to keep working the way that I am doing for be ready for the next. The season is long, I know. Beginnings are tough.

"I need to be ready to accept all the situations that's going to happen or happened and try to be strong, accepting everything, and working hard to be back the way that I want to be.

"When I say 'be back,' I don't mean win or lose, I mean have the feeling on court that when you are there you feel confident, you feel you can compete against everybody with equal conditions."

Nadal questioned whether Berdych could go on to win his maiden major, claiming the Czech had a lot of help getting past the third seed.

"He played well, obviously," Nadal said.

"But my feeling was that I help him a lot in the beginning, no?

"[It] is easier to play well when you are up in the score, one break up, two breaks up from beginning of every set, no?

"That's a big deal, big difference."