In a dramatic finale, Humphries overcame a case of final-day butterflies to claim his first major amateur title since returning to the ranks.

Thirty-four-year-old Humphries from Goulburn in the NSW southern tablelands delivered a masterclass in steely determination, overcoming early pressure from overnight leader Josh Boaz and Randwick's Michael Williams in a thrilling three-way duel.

Starting the final day one shot behind Boaz, Humphries made his intentions clear with birdies on his opening two holes. However, the challenge intensified as both Williams and Boaz refused to go away, with each player taking turns at the top of the leaderboard as the round progressed.

Humphries suffered his only blemish of the day with a bogey on the par-3 5th hole. He quickly recovered with a birdie on the reachable par-5 8th. From that point on, his play was flawless.

Back-to-back birdies on the 13th and 14th holes propelled him to a remarkable back nine of 33, to finish with an impressive four-under-par 66 and a three-round total of nine under (203) to claim victory by a stroke from the never-say-die Boaz.

"It is a little bit emotional, actually," Humphries said, visibly moved after sinking his final putt. "To come back and play just for a bit of fun and win feels really good."

"It doesn't matter what level you're at; getting those competitive juices flowing feels great, but you've still got to hit the shots at the right time. The butterflies tell you that it means something; the nerves are meant to be there."

Humphries' victory story is remarkable for someone who stepped away from professional golf to prioritise his young family.

After turning professional in 2014, he made the difficult decision in November last year to return to the amateur ranks, citing the pressures of professional golf and his responsibilities as a father.

"It's been 13 or 14 years since I won an amateur event, and when I decided to get my amateur status back, this was the event I was looking forward to," he explained. "Plus, I just wanted to play for the love of it again."

With a seven-hour drive home ahead of him and the likelihood he'll arrive when his family is asleep, Humphries said he'll have plenty of time to reflect on his achievement. Looking forward, he admitted there were still a couple of goals he'd like to achieve.

"I won an NSW Junior, and now I have an NSW Mid-Amateur, so maybe next is the NSW Amateur title. That's my motivation going forward now."

Final Scores

1 Luke Humphries (Goulburn) -9

2 Josh Boaz (Moore Park) -8

3 Michael Williams (Randwick) -7

4 John Betland (Forbes) -6

T5 Steven Slappendel (Horizons Resort Port Stephens) -4

T5 Steve Betland (Forbes) -4

7 Dillyn Burazin (Dunheved) -3

8 Cam Powell (Queensland) -2

T9 Justin Avendano (Shelly Beach) -1

T9 Timothy Murray (Armidale) -1

T9 Blake Palmer (Tamworth)-1