The 30-year birdied the 72nd hole at the Valero Texas Open to close with a 68 and a 12 under 276 total to claim the title by one stroke over countryman Brooks Koepka

Having endured several near misses in recent years, including four runner-up finishes this season, Chappell screamed with elation at making his eight-foot winning putt on the par-5 18th hole at the TPC San Antonio.

Chappell’s first near miss came in this event in his rookie year six years ago. Then, a late bogey cost him a play-off spot with eventual winner Brendan Steele. He wasn’t going to let that happen again.

"I'm just excited I don't have to answer that question (again) of what do I have to do to win," Chappell said.

“I felt like I had some unfinished business here and, you know, there's a lot of positives for me with this event, just one of the best run events we have all year. It's a course that really fits my eye. It's great for my family, getting to stay at the resort here and, you know, they're giving away 500 FedExCup Points.

“Those were the things that keep me motivated and key for me coming back here.”

Aaron Baddeley was the best of the Australians, shooting a final round 68 to finish in outright fifth. Queensland’s Cameron Smith also grabbed a spot in the top-10, taking a share of sixth place with his closing one under 71.

Aaron Baddeley says he is happy with where his game is at the moment. PHOTO: Steve Dykes/Getty Images.

Baddeley says he is happy with way he is playing in season 2017.

“I have played good over the year,” he said. “I think my putting let me down a little bit. I haven't capitalised on the good shots.

“My game is right there, really I feel like that, just stay the course and good stuff is going to happen and this week it played really nice.”