He didn't have his A Game but after more than three months away from golf Jason Day showed why he is the world's best player with a grandstand finish at the year's first event in Hawaii.

The World Number 1 holed a 12 foot putt for eagle on the 72nd hole of the Plantation Course at Kapalua to finish just outside the top-10 at the Tournament of Champions.

After a huge tee shot and brilliant second, Day calmly rolled in the putt to post his third 3-under 70 of the week on his way to a 13-under-par total and T12.

The eagle was a highlight but there were several positives for Day who made an impressive 19 birdies for the week though also showed some rust with eight bogeys.

It was Day's first competitive outing since September last year when he withdrew from the TOUR Championship with a niggling back injury.

It was his second consecutive tournament withdrawal and he also missed a much anticipated return for the Australian Summer of Golf as he worked on his recovery.

But the 29-year-old showed no signs of that injury this week and said after his round he felt positive about his overall performance.

"I think there were a lot of positives I need to take away from this week," he said. "I felt like other than today, for the most part of the week, I drove it pretty solid.

"I hit a lot of quality shots into the greens I just need to tighten it up a little bit with proximity."

Day said he felt the only real element of his game that was disappointing was his putting.

"The putting wasn't quite there," he said, "but to finish at 13-under it was a decent week.

"Just solid but some soft errors out there and if I can tighten those up and give myself the opportunities I need to, hopefully I'll give myself a chance of winning soon."

Day was the best of the four Australians in the field with his final hole heroics vaulting him two shots clear of Rod Pampling whose 11-under total was good for T17.

Aaron Baddeley saved his best till last posting a 4-under final round to get to 6-under and T25 in the 32-man field while Greg Chalmers went the other way with a 1-over Sunday to drop to 5-under and T28.