Landry, who shared the overnight lead with Zach Johnson on 13 under, birdied four of the first six holes and then the 10th to reach 18-under with seven to play.
Andrew Landry in the new Texas Open champion aftwr he won in San Antonio.
Andrew Landry held his nerve at the Valero Texas Open on Sunday to claim his first PGA Tour victory.
Pars from both men on the par-five 18th meant it was the Texan native who lifted his maiden PGA Tour title, while Mullinax would finish in a share of second after Sean O'Hair chipped in for a birdie on the final hole.
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He closed with three straight birdies, holing an eight-foot putt at the par-five 18th to finish at 12-under 276, five strokes behind American victor Andrew Landry.
It was a first victory for Landry in his 32nd start on the PGA Tour.
"It was obviously a tough week this week", Landry said. Lahiri had two bogeys and two birdies on back nine, where he began the final round play.
On the 17th hole Mullinax sliced a shot, which fell short of the green and ended up in the bunker.
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Walker ended the week in outright fourth on 14 under and one shot ahead of two-time victor Zach Johnson, who ran up a scrappy six at the last to complete a disappointing 72. Afforded the luxury of two putts for the win, Landry rolled in his par save to cement a two-shot win.
"It's fantastic. It's a lot of fun to be standing among the best players in the world on that leaderboard", Niemann said.
"A complete lack of focus", Landry said of his second missed birdie putt in a row. "Just try to keep it up and hope to play well for the next weeks".
In January 2018, Landry had his career-best PGA Tour finish and only top-10 showing on Tour before Sunday when he lost in a four-hole, sudden-death playoff to Spain's Jon Rahm at the CareerBuilder Challenge in La Quinta, Calif.
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