Max Homa carded a superb final-round 65 to see out a one-shot triumph in the Fortinet Championship, ahead of Maverick McNealy who had led for much of the day.
The 30-year-old played his first nine holes in 33 shots following three birdies in the space of four holes from the 6th, but he still remained two shots behind joint 54-hole leader McNealy.
He bogeyed the par-4 10th hole when he failed to get up and down from short of the green, but he then made amends when holing out for eagle from inside of 100 yards at the par-4 12th.
Homa added a birdie at the par-4 13th from 20 feet to move into a tie for the lead and he then two-putted for yet another birdie at the par-5 16th to briefly move one shot clear of McNealy.
McNealy birdied the 16th hole to lock horns with Homa on 18-under par with two holes to play, but then the pivotal moment unfolded at the par-4 17th.
Homa drained a massive putt from 18 feet to move one shot clear on 19-under par, but McNealy made a mess of the hole when he took two chips to get onto the green and it would lead to a disastrous double-bogey six.
Homa made a par on the 72nd hole to secure a three-shot advantage, and although McNealy made an eagle on the 18th hole, it wasn't enough to steal the title from Homa's grasp.
Max Homa - What's in the bag?
Driver: Titleist TSI3 | 9˚ | Aldila Rogue Black 130 MSI 60 TX shaft
3-wood: Titleist TSi2 | 15˚ | Aldila Rogue Silver 130 MSI 80 TX shaft
5-wood: Titleist TSi2 | 21˚ | Graphite Design Tour AD XC 9 TX shaft
Irons: Titleist 620MB (4-9) | KBS $ Taper 130 X shafts
Wedges: Titleist Vokey Design SM8 (46, 50, 56, 60) | KBS $ Taper 130 X (46-56), KBS Hi Rev 2.0 125 S (60) shafts
Putter: Scotty Cameron Phantom X 5.5 Prototype
Ball: Titleist Pro V1