Washington - Justin Thomas captured his 10th career PGA title on Sunday, holding off fellow American Patrick Cantlay down the back nine to win the BMW Championship in record-smashing fashion.
The 2017 PGA Championship winner seized his first triumph since last year's WGC Bridgestone Invitational, defeating Cantlay by three strokes, and claimed the top spot in the US PGA playoff point standings entering next week's season-ending Tour Championship.
"I was really nervous today," said Thomas, who began the day with a six-stroke advantage. "It's hard to play with the lead. I was enjoying it though.
"I forgot how hard it is to win. That's why it has taken this long. I've been working hard to get back to it and it feels great."
Thomas fired a four-under par 68 to finish 72 holes at Medinah on 25-under 263, shattering the former mark of 23-under at the 116-year-old event shared by American Dustin Johnson and Australian Marc Leishman.
Thomas birdied four of the last eight holes at the suburban Chicago layout to fend off Cantlay, who closed with birdies on four of the last six holes and nine birdies in all.
"I just stayed patient," Thomas said. Patrick made that very interesting. I hit the ball so bad to start the day. I couldn't hit a fairway. That was a hard start."
After seeing his lead shrink to two shots, Thomas landed his approach two feet from the cup at 11 to set up a birdie and surged to the finish.
"That birdie on 11 was huge," he said. "It kind of propelled me."
Thomas, who won the 2017 FedEx Cup playoff crown, made himself the player to beat in next week's Tour Championship at East Lake in Atlanta.
Thomas will start at 10-under par with a two-stroke lead over second-place point producer Cantlay in next week's event under a new points format that ensures the tournament winner will capture the playoff crown.
For Thomas, that means sitting on a lead for four days before he swings a club.
"I'm just going to go out there and try and play as well as I can," Thomas said. "I'm going to try not to look at the leaderboard. I've got to drive the ball a whole lot better than I did this week."
Japan's Hideki Matsuyama finished third on 268 after his second 63 in three days, a third-round 73 spoiling his title bid. He needed only 20 putts Sunday.
American Tony Finau finished fourth on 270, one shot ahead of countryman Brandt Snedeker and Spain's Jon Rahm.
But Finau's 69 was not enough for him to overtake Bryson DeChambeau for the final automatic berth on the US team for December's Presidents Cup in Australia, qualifying for which ended Sunday.
Thomas opened with a bogey and even with tap-in birdies at the par-5 fifth and seventh holes saw his lead shrink to only two over Cantlay after he also made bogey at 10.
The tap-in birdie by Thomas at 11 was followed by Thomas matching Cantlay's 15-foot birdie putt at the par-3 13th with a 12-foot birdie putt of his own to stay three ahead.
Cantlay lipped out a seven-foot birdie putt at 14 then drove the green at the par-4 15th but missed a 17-foot eagle putt.
Thomas and Cantlay each birdied 15 and Cantlay botched a four-foot par putt at 16 to leave Thomas four ahead with two holes remaining.
Cantlay sank an 18-foot birdie putt at the par-3 17th and a 38-footer for birdie at 18 but Thomas closed with a 14-foot birdie for the win.
Players who moved into the final 30-man Tour Championship field by their results at Medinah included Matsuyama, 2009 US Open winner Lucas Glover and fellow American Jason Kokrak.
Tiger Woods, last year's Tour Championship winner, and Jordan Spieth were among those unable to claw their way back into the top-30 in order to qualify for East Lake.
Leading scores after Sunday's final round of the US PGA BMW Championship at Medinah in suburban Chicago: (par 72, USA unless noted):
263 - Justin Thomas 65-69-61-68
266 - Patrick Cantlay 66-67-68-65
268 - Hideki Matsuyama (JPN) 69-63-73-63
270 - Tony Finau 67-66-68-69
272 - Jon Rahm (ESP) 68-69-66-69, Brandt Snedeker 66-71-67-68
273 - Lucas Glover 66-69-69-69, Corey Conners (CAN) 69-66-69-69
274 - Adam Scott (AUS) 67-71-69-67, Kevin Kisner 68-68-69-69
275 - Im Sung-jae (KOR) 70-72-66-67, Louis Oosthuizen (RSA) 70-69-68-68, Tommy Fleetwood 70-66-70-69, Kevin Tway 69-67-70-69, Rickie Fowler 67-70-68-70
276 - Vaughn Taylor 73-70-67-66, J.T. Poston 68-74-66-68, Rory Sabbatini (SVK) 67-68-67-74
277 - Marc Leishman (AUS) 72-71-67-67, Jason Kokrak 65-73-70-69, Patrick Reed 68-71-68-70, Rory McIlroy (NIR) 69-67-70-71, Xander Schauffele 67-68-70-72
278 - Webb Simpson 70-72-67-69, Brooks Koepka 68-71-72-67, Paul Casey (ENG) 70-70-67-71, Joel Dahmen 66-71-69-72
279 - An Byeong-hun (KOR) 71-70-69-69, Abraham Ancer (MEX) 68-72-69-70, Kim Si-woo (KOR) 70-67-71-71