MARC Leishman is celebrating his breakthrough win on the USPGA Tour after firing a sizzling final round 62 in the Travelers Championship in Connecticut.
Leishman endured a nervous wait to see if his 14-under total would be enough to give him victory.
American Roland Thatcher needed to birdie his final hole to force a playoff but couldn't.
Leishman was stunned moments after Thatcher failed to hole a bunker shot.
"I can't believe it right now," Leishman said.
"I said to my caddie this morning on the range we would probably have to get to 15 under and that would give us a chance.
"I didn't quite do it, I didn't think 14 under would be good enough. It's a funny game, a real funny game."
Leishman, who started the day tied for 20th, had a bogey-free round which included eight birdies.
The Warrnambool pro made five birdies in his first eight holes.