FARMINGDALE — What felt like a battle for Brooks Koepka looked like a runaway Friday in the PGA Championship.

Koepka backed up his record-tying 63 with a round that put him in a league of his own. With three birdies in a four-hole stretch at the start and at the end, the defending champion posted a 5-under 65 that shattered the 36-hole score for a major championship.

More important to Koepka was a seven-shot lead over Jordan Spieth and Adam Scott going into the weekend. That set another PGA Championship record and was the largest at the halfway point of any major since Henry Cotton led by nine in the 1934 British Open.

Just imagine what Koepka could do if he really brings it at Bethpage Black.

"This probably sounds bad," Koepka said, "but today was a battle. I didn't strike it that good. The way I hung in there today and battled it, I think that was probably more impressive than yesterday, not having your 'A' game but still being able to shoot a great score."

Koepka was at 12-under 128, breaking by two shots the record shared at all four majors, most recently by Gary Woodland in the PGA Championship last year at Bellerive.

The dominance should have looked familiar to the throaty gallery on this working man's public course.

Bethpage Black first hosted a major in the 2002 U.S. Open, when Tiger Woods overpowered the course and the field in a wire-to-wire victory.

This time, Woods was merely along for the ride, and it was a short one.

A month after his Masters victory that made him the betting favorite at the PGA Championship, Woods started the back nine with three straight bogeys and never recovered, shooting a 73 to miss the cut for the ninth time in a major.

"I've enjoyed being the Masters champion again, and the PGA was a quick turnaround," Woods said. "And unfortunately, I just didn't play well. As I said, I didn't do all the little things I need to do correctly to post good scores and put myself in position to shoot good scores."

Koepka did everything right, no matter how it felt to him.

Spieth was hopeful of being in contention at a major for the first time since the British Open last summer, and he made key putts for par and a 40-foot birdie putt toward the end of his 66 to get within two shots before Koepka teed off in the afternoon. It was close enough — at the time, anyway — for Spieth to get queried about the missing piece of a career Grand Slam at the PGA Championship.

"If I'm able to put some good work in tomorrow, I will be in contention on Sunday. And at that point, it will be just more of trying to win a golf tournament," he said.

His goal was to stay in range, and Spieth felt he did enough.

And then Koepka flipped a wedge into 3 feet for birdie on No. 1, hit another wedge to 8 feet for birdie on No. 2 and hit 7-iron to 18 feet on the par-5 fourth hole that set up a two-putt birdie.

He really poured it on at the end as Scott and Matt Wallace of England moved closer.

On two of the strongest holes in the finishing stretch, Koepka mashed a drive down the middle of the 15th fairway and hit 9-iron to 3 feet, one of only 10 birdies from 155 players in the field. He hit wedge into 5 feet on the 473-yard 16th hole for another birdie, and the record was in sight.

He finished with a wedge out of thick grass right of the 18th fairway, pouring in a final birdie from just inside 12 feet. It was his 14th birdie of the week.

Koepka plays a game with which Woods is familiar — a younger version of Woods, anyway.

"Relative to the field, I was about that long early in my career," the 43-year-old Woods said. "When you're able to hit the ball much further than other players, and get on the right golf courses where setups like this is penalizing if you are a little bit crooked, and if he does miss it, he misses on the correct sides, and he's far enough down there to where he was able to get the ball on the green and he did all the little things right.

"He had the good angles. He missed the ball in the correct spots, and it adds up to a big lead. And as I said, there's no reason why he can't increase this lead."

That's what Koepka has in mind.

"I'd like to see that lead grow as large as it possibly can," Koepka said. "I still have to go out there and do what I'm supposed to do, keep putting the ball in the right spot and make sure that you don't make any double bogeys, and I should have a good chance of winning the championship."

Scott, who pushed Koepka all the way to end at the PGA last year in St. Louis, ran in putts from 25 feet, 40 feet and 30 feet on the opening three holes — only to settle for par on the easiest hole at Bethpage Black at the par-5 fourth — and was 7 under with four holes to play, a chance to break the PGA record of 63 that Koepka had matched the day before.

That ended when Scott missed a 2-foot par putt on the 17th, and he had to get up-and-down from the fairway for par on the 18th.

And then he saw what Koepka was doing.

"I have to post two more good ones by the look of it at this stage," Scott said.

Dustin Johnson had a 67 and was among five players at 4-under 136. Justin Rose had a 67 and was at 3-under 137, a good score on Bethpage except in this case he was nine shots behind.

Everyone needs help from a player who has won three of the last seven majors and was runner-up in the last one at Augusta National.

Friday

At Bethpage Black

Farmingdale, N.Y.

Purse: $11 million

Yardage: 7,459; Par 70

Second Round

Brooks Koepka 63-65—128 -12

Jordan Spieth 69-66—135 -5

Adam Scott 71-64—135 -5

Daniel Berger 70-66—136 -4

Dustin Johnson 69-67—136 -4

Kelly Kraft 71-65—136 -4

Matt Wallace 69-67—136 -4

Luke List 68-68—136 -4

Justin Rose 70-67—137 -3

Danny Lee 64-74—138 -2

Sung Kang 68-70—138 -2

Jazz Janewattananond 70-68—138 -2

Harold Varner III 71-67—138 -2

Erik van Rooyen 70-68—138 -2

Tommy Fleetwood 67-71—138 -2

Louis Oosthuizen 70-68—138 -2

Rickie Fowler 69-69—138 -2

Hideki Matsuyama 70-68—138 -2

Patrick Cantlay 69-70—139 -1

Bronson Burgoon 73-66—139 -1

Scott Piercy 72-67—139 -1

Mike Lorenzo-Vera 68-71—139 -1

Chez Reavie 68-71—139 -1

Xander Schauffele 70-69—139 -1

Charles Howell III 72-67—139 -1

Matt Fitzpatrick 75-65—140 E

Gary Woodland 70-70—140 E

Keegan Bradley 70-70—140 E

Zach Johnson 71-69—140 E

Phil Mickelson 69-71—140 E

Matt Kuchar 70-70—140 E

Jimmy Walker 70-70—140 E

Tyrrell Hatton 71-69—140 E

Francesco Molinari 72-68—140 E

Lucas Bjerregaard 71-69—140 E

Ross Fisher 74-67—141 +1

Lucas Glover 72-69—141 +1

Paul Casey 70-71—141 +1

Pat Perez 68-73—141 +1

Danny Willett 71-70—141 +1

Webb Simpson 72-69—141 +1

Beau Hossler 72-69—141 +1

Brandt Snedeker 74-67—141 +1

Max Homa 70-71—141 +1

Aaron Wise 70-71—141 +1

Marty Jertson 72-69—141 +1

Joel Dahmen 70-72—142 +2

Billy Horschel 70-72—142 +2

Kurt Kitayama 74-68—142 +2

Adam Hadwin 72-70—142 +2

Sam Burns 70-72—142 +2

Henrik Stenson 74-68—142 +2

Charley Hoffman 73-69—142 +2

Graeme McDowell 70-72—142 +2

Haotong Li 73-69—142 +2

Alex Noren 73-69—142 +2

Jason Kokrak 73-70—143 +3

Cameron Champ 72-71—143 +3

Emiliano Grillo 76-67—143 +3

Thorbjørn Olesen 73-70—143 +3

Tony Finau 70-73—143 +3

Rory McIlroy 72-71—143 +3

Jason Day 69-74—143 +3

Kevin Tway 73-70—143 +3

Cameron Smith 73-70—143 +3

Abraham Ancer 73-70—143 +3

Adam Long 73-70—143 +3

Ryan Vermeer 70-74—144 +4

Rich Beem 75-69—144 +4

Rafa Cabrera Bello 75-69—144 +4

Corey Conners 72-72—144 +4

Rob Labritz 75-69—144 +4

J.J. Spaun 72-72—144 +4

Thomas Pieters 74-70—144 +4

Kiradech Aphibarnrat 76-68—144 +4

Andrew Putnam 74-70—144 +4

David Lipsky 70-74—144 +4

Shane Lowry 75-69—144 +4

Justin Harding 74-70—144 +4

J.T. Poston 77-67—144 +4

Joost Luiten 72-72—144 +4

Lucas Herbert 74-70—144 +4

Failed to make the cut

Adrian Otaegui 73-72—145 +5

Steve Stricker 73-72—145 +5

Martin Kaymer 74-71—145 +5

Jon Rahm 70-75—145 +5

Kevin Na 72-73—145 +5

Ryan Armour 74-71—145 +5

Jim Furyk 73-72—145 +5

Tyler Hall 72-73—145 +5

Michael Kim 74-71—145 +5

Dylan Frittelli 77-68—145 +5

Patton Kizzire 70-75—145 +5

Keith Mitchell 74-71—145 +5

Kyle Stanley 71-74—145 +5

Sergio Garcia 74-71—145 +5

Bubba Watson 76-69—145 +5

Russell Knox 72-73—145 +5

Tiger Woods 72-73—145 +5

Julian Suri 72-73—145 +5

Martin Trainer 75-70—145 +5

Sungjae Im 71-74—145 +5

Branden Grace 73-73—146 +6

Ian Poulter 72-74—146 +6

Bryson DeChambeau 72-74—146 +6

Si Woo Kim 69-77—146 +6

Richy Werenski 72-74—146 +6

Patrick Reed 74-72—146 +6

Joaquin Niemann 75-71—146 +6

Tom Lewis 76-71—147 +7

Ben Cook 74-73—147 +7

Lee Westwood 75-72—147 +7

Shaun Norris 73-74—147 +7

Troy Merritt 72-75—147 +7

Shugo Imahira 74-73—147 +7

Brian Mackey 74-73—147 +7

Marc Leishman 74-74—148 +8

Mikko Korhonen 74-74—148 +8

Byeong Hun An 74-74—148 +8

Richard Sterne 75-73—148 +8

Jason Dufner 76-72—148 +8

J.B. Holmes 71-77—148 +8

Ryan Fox 78-70—148 +8

Michael Thompson 77-72—149 +9

C.T. Pan 78-71—149 +9

Satoshi Kodaira 73-76—149 +9

Chesson Hadley 72-77—149 +9

Jason Caron 70-79—149 +9

Justin Bertsch 77-73—150 +10

Ryan Moore 73-77—150 +10

Jorge Campillo 77-73—150 +10

Casey Russell 77-73—150 +10

Rich Berberian, Jr. 76-75—151 +11

Eddie Pepperell 76-75—151 +11

Y.E. Yang 76-75—151 +11

John Daly 75-76—151 +11

Ryan Palmer 77-75—152 +12

Padraig Harrington 75-77—152 +12

Alex Beach 77-75—152 +12

Brandon Stone 79-73—152 +12

Kevin Kisner 77-76—153 +13

Jhonattan Vegas 76-77—153 +13

Craig Bowden 78-75—153 +13

Rod Perry 77-77—154 +14

Brian Harman 77-77—154 +14

Shaun Micheel 77-77—154 +14

Alex Björk 80-75—155 +15

Danny Balin 78-77—155 +15

Brendan Jones 78-77—155 +15

John O'Leary 79-78—157 +17

Stuart Deane 82-76—158 +18

Craig Hocknull 82-77—159 +19

Jeffrey Schmid 81-78—159 +19

Cory Schneider 74-85—159 +19

Andrew Filbert 84-82—166 +26