Unfortunately for Stuard, the consistent swing and clutch putting weren't enough to overcome Kevin Na, who finished 23-under-par and defeated Patrick Cantlay in the second hole of a playoff tiebreaker to take medalist honors at the event.
It was a bitter finish for Cantlay, who won his first PGA Tour event in Las Vegas in 2017 in a playoff, but had to settle for a runner-up finish the second straight year.
"It came down to the end and it was too close because I had the lead and made a triple-bogey", said Na, who drove wildly and three-putted the 10th green for a 7. He went at the flag and found the water on the par-5 16th for a bogey to lose the lead for the first time all day.
He closed with a 1-under 70.
Beginning the day two strokes back, Cantlay holed a 35-footer at the first but missed from five feet to save par at the third, as Na followed an eight-foot birdie at the sixth by nailing a 25-footer at the next. Only Brooks Koepka (four) has more wins in that span.
After returning to the 18th tee, Cantlay made bogey, allowing Na - a Las Vegas resident - to sink a short par putt and clinch the win. "I kept telling myself 'This is a playoff that I'm going to win".
Kevin Na holds up the trophy after winning the Shriners Hospitals for Children Open golf tournament on the second playoff hole in Las Vegas.More news: No prospect of UAW agreement with GM in sight
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Both players birdied the first extra play-off hole, before a par at the next hole was enough for Na to secure his fourth PGA Tour title and see him join Jim Furyk as the only multiple victor of the event. As much as he took advantage of Na's blunders, Cantlay made some of his own.
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On the closing hole, Cantlay hit the longest drive of the final round - 345 yards - and had only 113 yards left. Na poured his in, walking toward the hole before the ball dropped.
Na sank a four-foot par putt at the second extra hole at TPC Summerlin to see off Cantlay, but he should have had the title sewn up well before.
"I hit a great putt", he said.
Defending champion Bryson DeChambeau (68) sits back in a tie for 21st at 8 under in a group that includes Phil Mickelson (69).
While he offset a bogey on No. 8 with a birdie on No. 9 to close out his front nine, Na fell apart on the par-4 10th.