- Thomas on his PGA of America heritage; he is the son and grandson of PGA club pros.
With those around him dropping shots with regularity, Thomas took full control of the tournament when chipping in for birdie at the par-3 13th and moved three strokes clear with a clutch 10-footer for birdie at the par-3 17th.
What's interesting about Stroud is that for as middling as his 13-year professional golf career has been, he first landed on the PGA Tour 11 years ago.
Rickie Fowler carded an impressive four-under par on the final day which helped him secure fifth place tied with Hideki Matsuyama.
Thomas made headlines at Erin Hills in June with a nine-under 63 in round three, but ultimately finished in a tie for ninth - eight shots behind victor Brooks Koepka - following a final-round 75.
He won back-to-back events on the Tour's Hawaii swing in January including carding a 59 at the Sony Open, before shooting the US Open's lowest score in relation to par (nine-under 63) at Erin Hills in June.
Thomas failed to make the most of 14 and 15, the latter birdied by Matsuyama from 12 feet to get him back within a shot, while Kisner gained shots at both holes to get back to seven under. Thomas briefly pointed for the ball to go in, then started walking away.
Thomas was immediately congratulated by best friend Jordan Spieth, who had to settle for the next best thing, his best buddy winning, after his bid to become the youngest player to complete the career Grand Slam victor fell by the wayside.More news: Augusta nightmare will not affect Open bid - Spieth
"This means a lot", said an emotional Thomas.
Thomas didn't start the round looking like the eventual victor after making bogeys on two of the first three holes. Oosthuizen has now finished runner-up in all four majors.
Fiery Patrick Reed, a five-time PGA Tour victor, had never contended in a major before Sunday.
"It will be an exciting finish, I think, with 16, 17 and 18, and even with the drivable par-4 14th in there as well", Rory McIlroy said.
Meanwhile, Denmark's Thorbjorn Olesen and American Kevin Kisner each fired a four-under 67 to grab a share of the lead after 18 holes of play, reports Efe. At the beginning of the final round, only three of the top 25 players on the leaderboard had previously won majors (Australia's Jason Day, South Africa's Louis Oosthuizen and Sweden's Henrik Stenson).
Six-time major champion Nick Faldo labelled Day's attempt to go for the green from behind a tree - needing a big hook off pine straw around trees - "one of the craziest decisions I've ever seen". A birdie two at the short 13th, where he chipped-in, was soon enough followed by another deuce at the 221-yard penultimate hole. He's continued that form at Quail Hollow, especially on the greens, where he leads the field in Strokes Gained: Putting.
"And so being a new experience, maybe I'll be a little nervous, but on the other hand, I'm looking forward to the weekend and seeing how I do".