Lia, who turns 22 in January, becomes the fourth different champion of the G4D Tour’s inaugural season, joining four-time winner Kipp Popert, Mike Browne and Tommaso Perrino.
He birdied four on a three-under back nine to take the win with a total of three over, with Biggins and Canadian Kurtis Barkley tied for second at seven over.
“It was very exciting, special today,” said Lia, who was the only player to shoot at normal level or better over the two days of competition. “It’s unreal to be here right now.”
Lia started his final round with a birdie first for the second day in a row, but two bogeys then a double bogey in the ninth saw him turn 39 with a one-stroke advantage over world number one Popert, Biggins and Brendan Lawlor.
But with players hot on her heels on the back nine, Lia found her mojo to record three consecutive birdies from the 13th, before nullifying a bogey at the par-three 17th with a closing birdie to seal a deserved triumph.
“I really felt the pressure,” he said. “I didn’t watch the standings much but I had a feeling it was going to be close. I made some nice birdies on the back nine and managed to finish strong.
Lia, who had her father Trond caddy for the first time this week, was one of eight leading disabled golfers to compete in the final event of the G4D Tour’s inaugural season.
During the year, seven events were held on the same course and in the same week as the DP World Tour tournaments, and Lia says a strong message was sent to inspire future generations of disabled golfers.
“Work hard, keep believing in yourself and maybe we can be on that stage one day,” he said.