Spieth looking for another gear

Jordan Spieth says he hopes to play at his best in Sunday's final round of the Australian Open.

The 22-year-old world number one is three strokes behind the leader Matt Jones after 54 holes, but improved his chances of back-to-back victories at the Australian Golf Club after notching an eagle two at the par-four 17th.

"We've been working on some things," Spieth told reporters from the clubhouse following his round.

"They've just gotten a little bit easier day-to-day and my putting's been just a slightly better day today, and so I do believe that I have yet to peak at this tournament.

"I don't know if it will be good enough, but I think that I'll peak tomorrow."

Spieth says his third round 67 was one of the "best fought" rounds of his career, after he started with three bogey in four holes but notched four birdies and an eagle in his last 10 holes.

In last year's event, Spieth carded a final round 63, a course record, to win the tournament by five shots. Spieth, though, says memories of that round will be put in the back of his mind

"You want to remember the putts you made and kind of the rhythm you were in and feeding off the crowd, but at the same time you can't expect to have that kind of a round," he said.

"You've got to expect to battle and to be tight and for Matt to be up there as a tough guy to chase.

"Matt Jones has played the best golf for three rounds, he's played better golf than I have and I have to somehow not only play better golf, but play better golf by multiple shots."