Sam Burns is a PGA Tour winner again at the Valspar Championship, this time with a lot more stress and plenty of emotion.
Burns holed a birdie putt from just over 30 feet on the 16th hole to beat 2014 U.S. Junior Ryder Cup teammate Davis Riley on the second play-off hole and secure his third PGA Tour victory in his past 22 starts.
Burns, who closed with a two-under 69, is the second straight back-to-back winner at Innisbrook after Paul Casey's consecutive wins in 2018 and 2019.
The Florida tournament was cancelled in 2020 because of the pandemic.
The victory moves Burns to No.10 in the world for the first time, knocking Dustin Johnson out of the top-10 for the first time in seven years.
"Man, it's crazy," Burns said.
"Davis played well today, especially the way he finished. I tried to stay steady. I didn't make a lot of mistakes.
"A lot of time on Sunday if you plot your way around, make a bunch of pars, throw in a few birdies, a lot of times it works well. So happy."
Burns won last year by three shots.
"A lot of time on Sunday if you plot your way around, make a bunch of pars, throw in a few birdies, a lot of times it works well. So happy." - Sam Burns.
Riley, a rookie contending for the first time in his 25th career start on the PGA Tour, overcame a triple bogey on the par-5 fifth hole with a clutch 5-iron and putt for birdie on the par-3 17th.
He had a 15-foot birdie putt on the 18th for the win and left it out to the right, closing with a 72 to join Burns at 17-under 267.
Both made pars on the 18th in the playoff, with Riley saving par from a front bunker.
Neither looked to be in great birdie position on the 16th until Burns' putt caught the left edge and went 180 degrees around the cup before falling in the back side.
Riley hit a strong pitch needing to hole it to extend the playoff and missed long.
Entering the week ranked 399th in the world, Riley would have vaulted up almost 300 spots with a victory but instead he would have to be content with his best PGA Tour finish to date.
Justin Thomas (70) and Matthew NeSmith (71) each finished one shot out of the playoff, and each had a share of the lead at some point during a tense final round in warm, windy conditions on the Copperhead course.
Englishman Matt Fitzpatrick and Brian Harman shared fifth at 14-under with both closing with rounds of 68.
The low round of the day was Brooks Koepka's six-under 65, two shots better than anyone else in the field and vaulted the four-time major winner 33 spots into a tie for 12th at 11-under.