Two rounds of 68 on the weekend saw Herbert finish in a tie for seventh at 11-under par, seven shots behind winner Cameron Smith, who defeated Jordan Zunic in a play-off.

In the past three weeks Herbert finished second at the New South Wales Open, tied for sixth at the Australian Open and tied seventh in the Australian PGA. He earned a cheque for $39,187.50 on Sunday to take his earnings in the past three weeks to more than $120,000.

After playing two rounds with former world number one Jason Day in the Australian Open, Herbert played alongside US Masters champion Sergio Garcia on Sunday.

Herbert, 21, showed his class by outplaying the Spaniard.

The Neangar Park product had seven birdies and three bogeys in his four-under par 68, while Garcia battled with four birdies, four bogeys and a double bogey in his two-over par 74.

Fellow Bendigo golfer Andrew Martin finished the tournament strongly, firing a three-under par 69 to be one-under par the tournament in a tie for 50th.

Smith overcame heckling from a fan on the 72nd hole to defeat Zunic on the second play-off hole.

"He just said a few nasty things there telling me not to choke. I tried to play it off," Queenslander Smith said of the heckling on the 72nd hole.

"I guess he was from NSW.

"Earlier I hit the bottom of pin and that was a bit like, you know, am I not meant to win this thing."

Smith had earlier edged in front, a superb wedge approach over trees giving him eagle on the 17th and an outright lead for the first time all tournament.

But a bogey on the last when he missed a putt from two metres gave Wollongong 25-year-old Zunic a lifeline as both men finished 18 under.

Both parred their repeat of the 18th, with a superb chip from a tough lie on the following sudden-death hole giving Smith the advantage.

Zunic's three-metre effort lipped out while Smith made no mistake the second time to earn his first professional win in Australia and second overall to follow the Zurich Classic teams crown in New Orleans in May. 

"It's huge," Smith said. "I remember going there with dad. It was one of my goals to win one down here and being in Queensland makes it that bit more special."

Smith won nearly $240,000 and an exemption on the European Tour until the end of 2019.

Adam Bland finished third at 17-under, while Marc Leishman and David Bransdon were at 14-under.