Spieth was not confident of Australian Open chances

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Jordan Spieth was not convinced he could pull off another Australian Open victory before thriving under the pressure to come out on top in a three-way play-off on Sunday.

The two-time major champion regained the title he won two years ago courtesy of a birdie at the first extra hole, with Australian duo Ashley Hall and Cameron Smith only able to make par.

Spieth was runner-up to Matt Jones at the Royal Sydney Golf Club last year, but the former world number one went one better 12 months on.

The American surged to the top of the leaderboard thanks to his final-round 69 at the PGA Tour of Australasia tournament, having started the day two shots behind overnight leader Geoff Ogilvy.

He made a statement by starting with back-to-back birdies, but was not sure he would be holding the Stonehaven Cup once again

"I felt like I really played well, I felt like I played well this week," Spieth said.

"I got off with the driver and three wood, and putting throughout the week wasn't tip-top shape; but my short game was there, the iron play was solid, so it certainly felt like I was playing well enough to be in contention, just wasn't sure about winning.

"And then we made the putts at the very end that mattered."

Spieth hopes to return to defend his title late in 2017, but was unable to make a firm commitment. 

"We love coming here, certainly plan on it...it's hard to tell," he added.

"But how can you argue with coming here and gaining the confidence that we've had out of this event? So I certainly plan to, but I just don't know what's going to happen 12 months from now.

"I've cut out a lot of overseas travel this year, but we still came here because that's how important this event is to us.

"And I haven't gone anywhere else...so even if overseas travel is trimmed out we still like coming here and plan to [in 2017], it's just I certainly can't say yes or no right this second."