Pampling sank a 32-foot birdie putt on the last hole to complete a final-round 65
Pampling sank a 32-foot birdie putt on the last hole to complete a final-round 65, six-under par, and finish 72 holes on 20-under 264.
"It's a great feeling," Pampling said. "It's amazing."
The 47-year-old from Brisbane took his third crown on the US tour, having previously won the 2004 International and in 2006 at Arnold Palmer's Bay Hill event.
"It's extremely rewarding. Winning Arnold Palmer's event in '06 is still on top but coming back from what we had the last few years is phenomenal."
Pampling, ranked 451st in the world, birdied four of the last six holes on the front nine, stumbled with bogeys at the 10th and 12th holes at the TPC at Summerlin, then charged back with three birdies in a row starting at the par-5 13th.
The Aussie sank a 13-foot birdie putt at the 13th, an 18-footer at the par-3 14th to grab a share of the lead and an 11-footer at the 15th to stay level with Glover, the 2009 US Open champion who hasn't won a title in five years.
Glover, seeking his first triumph since 2011 at Quail Hollow, birdied 15 from four feet to stay with Pampling but found a greenside bunker and took a bogey at the par-3 17th then another at 18 to finish third on 267, one stroke behind Koepka, who charged late with birdies on 13, 15 and 16.
Pampling, who has a US PGA exemption until he is just about ready for the 50-and-over tour, kept his confidence that he could win despite struggling between the PGA and developmental tours in recent seasons.
"It's just the self belief that I know it's still there, the body is still healthy -- I know I have the game for out here," said Pampling. "It's just still grinding on the web.com tour and knowing I can compete with the younger guys."
Italy's Francesco Molinari fired a final-round 61 to share fourth on 268 with American Harris English, who shot 67 all four days, and Aussie Geoff Ogilvy, the 2006 US Open champion.