Aaron Wise has claimed his first PGA Tour victory with a bogey-free final round at the the AT&T Byron Nelson in Dallas.

The 21-year-old hit six birdies to card a round of six-under 65, finishing three shots ahead of second-place Marc Leishman on 23-under overall – and claiming a new tournament record.

Australia’s Leishman – who produced a stunning opening round of 61 – shot 68 on day four, recovering from a bogey on the second hole to hit an eagle on the par-four fifth, before two further wayward shots gave him bogeys on the 10th and 15th holes.

Wise, who shared a four-shot lead with Leishman heading into the final round, continued to pull away from his opponent on a day hit by a four-hour weather delay, with four birdies in a row on holes seven to 10.

In a video posted on the PGA Tour Twitter page, he told a press conference: “It was awesome, everything I dreamed of. It was incredible. Marc played great, really gave me a run for his money. He hit the ball incredible. I knew he would have a ton of looks from hole three on, and he did. Unfortunately, he didn’t make all the putts and I was able to edge him out.

“It was just a great day for me. I came out really solid. I’ve been hitting the ball amazingly all week and that continued today.

“And I was able to finally get the putter hot in the middle stretch of that round and birdieing seven through 10 really set me apart because I looked at the leaderboard there on eight green and realised that a lot of people were making an early charge and I knew I needed to kind of separate myself and I was able to do that because my putter got hot and to walk up 18 knowing I kind of had it locked up was pretty cool.

“I don’t think many people get to do that their first win. It was truly special for me to be able to take in the crowd like that.”

Branden Grace fired a round of 62 – to match his lowest career best – and finish in joint third with JJ Spaun and Keith Mitchell, who both got round the final day in 63 and ended on 19-under overall.

World number three Jordan Spieth struggled to make an impact on his home-town tournament, the Texan shooting 67, which included two bogeys and six birdies, to be tied for 21st on 11-under overall alongside defending champion Billy Horschel.

Scot Russell Knox finished in joint 16th on 12-under and Englishman Brian Davis dropped to 73rd on the leaderboard on one-over.