Rory McIlroy fired his best opening round at a major in 11 years on Thursday to seize the lead at the PGA Championship while Tiger Woods struggled in his second comeback event after severe leg injuries.
Seventh-ranked McIlroy, chasing his first major title since the 2014 PGA, fired a five-under-par 65 to grab a one-stroke lead over Americans Will Zalatoris and Tom Hoge with Americans Justin Thomas and Matt Kuchar and Mexico's Abraham Ancer on 67.
Sparked by four consecutive birdies, matching his longest such run in a major, McIlroy delivered his best opening round in a major since a 65 at the 2011 US Open, which he won for his first major title.
"It was a great start to the tournament," McIlroy said. "It was nice to get off to that good start and sort of keep it going."
Four-time major winner McIlroy started on the back nine with 15-time major winner Woods and Jordan Spieth before a huge crowd.
Woods, who returned last month at the Masters 14 months after a car crash left him unable to walk for months, birdied the 10th and par-3 14th but made bogeys on six of his last 10 holes to shoot 74 while Spieth, chasing a win for a career Grand Slam, stumbled to a 72.
"Off to a good start," Woods said. "Hit a lot of bad iron shots late. I just never got the ball close to have any good birdie putts. I kept putting it into bad spots.
"It was a frustrating day."
McIlroy, who last led a major round at the 2014 PGA, has had poor major starts but the Masters runner-up reeled off four consecutive birdies from the 12th through 15th holes.
The 33-year-old from Northern Ireland put his approach inches from the cup and birdied the par-4 12th, escaped a bunker for a tap-in birdie at the par-5 13th and made a 26-foot birdie putt at the par-3 14th.
"When your game is feeling like that, it's just a matter of going out there and really sticking to your game plan, executing as well as you possibly can," McIlroy said.
McIlroy sank a nine-foot birdie putt at 15 to take the solo lead and kept it with par saves at 16 thanks to a chip to two feet and a six-foot putt at 18.
McIlroy sank a 14-foot birdie putt at the second and an 11-foot birdie at the par-5 fifth, but missed the green and made bogeys at the par-3 sixth and par-3 eighth holes before closing at the ninth with a birdie putt from just inside 19 feet.
Zalatoris, with four top-eight efforts in seven major starts, made a career-best 150 feet of putts, including birdie efforts from 30 feet at the ninth, 23 feet at the 12th, 26 feet at the 13th and 24 feet at the seventh.
"It's super fun whenever you have days like that," Zalatoris said. "It was kind of a bizarre day."
Hoge, a February winner at Pebble Beach, was happy with his 66 as well.
"I was scrambling pretty good and got up-and-down on all of them," Hoge said. "That really gave me some momentum going forward."
Thomas, the 2017 PGA winner, sank a 20-foot birdie putt at 18 to pull within two of McIlroy.
"I'd call any birdie on 18 a steal," Thomas said. "To finish the day with a three there was a great bonus."
Tiger's leg hurting
Former world number one Woods, now ranked 818th, admitted his surgically repaired right leg "hurt."
"My leg is not feeling as good as I would like it to be," said Woods.
Three-time major winner Spieth made three bogeys in four holes starting at 15 on his way to a 72.
The world's three top-ranked golfers played together with over-par results.
World number one Masters champion Scottie Scheffler eagled the par-5 fifth but made five bogeys in the last 10 holes to shoot 71.
Second-ranked Spaniard Jon Rahm, the 2021 US Open winner, shot 73 while third-ranked American Collin Morikawa, reigning British Open champion, had only one birdie in shooting 72.
65 - Rory McIlroy (NIR)
66 - Tom Hoge (USA), Will Zalatoris (USA)
67 - Matt Kuchar (USA), Justin Thomas (USA), Abraham Ancer (MEX)
68 - Chris Kirk (USA), Mito Pereira (CHI), Xander Schauffele (USA), Cameron Smith (AUS), Kevin Na (USA), Davis Riley (USA), Matt Fitzpatrick (ENG), Lucas Herbert (AUS), Joaquin Niemann (CHI)
69 - Tony Finau (USA), Stewart Cink (USA), Webb Simpson (USA), Talor Gooch (USA), Patrick Reed (USA), Beau Hossler (USA), Dean Burmester (RSA), Thomas Pieters (BEL), Lee Kyung-Hoon (KOR), Aaron Wise (AUS), Patton Kizzire (USA)
70 - Shane Lowry (IRL), Francesco Molinari (ITA), Viktor Hovland (NOR), Alexander Norn (SWE), Ryan Fox (NZL), Gary Woodland (USA), Russell Henley (USA), Brendan Steele (USA), Max Homa (USA), Tyrrell Hatton (ENG), Robert MacIntyre (SCO)
71 - Justin Rose (ENG), Tommy Fleetwood (ENG), Kramer Hickok (USA), Adam Schenk (USA), Cameron Young (USA), Rickie Fowler (USA), Harold Varner III (USA), Scottie Scheffler (USA), Sam Burns (USA), Kevin Streelman (USA), Charl Schwartzel (RSA), Shaun Norris (RSA), Justin Harding (RSA), Seamus Power (IRL), Yang Yong-eun (KOR), Kim Si-woo (KOR), Sepp Straka (AUT), Jason Day (AUS)
72 - Marc Leishman (AUS), Cameron Davis (AUS), Adri Arnaus (ESP), Hideki Matsuyama (JPN), Yuki Inamori (JPN), Alex Cejka (GER), Henrik Stenson (SWE), Cameron Tringale (USA), Jordan Spieth (USA), Keegan Bradley (USA), Kevin Kisner (USA), Lanto Griffin (USA), Jesse Mueller (USA) J.J. Spaun (USA), Collin Morikawa (USA), Keith Mitchell (USA), Jason Dufner (USA) John Daly (USA), Bubba Watson (USA), Laurie Canter (ENG), Chan Kim (USA), Bernd Wiesberger (AUT)
73 - Daniel Berger (USA) Rich Beem (USA) Ryan Palmer (USA), Dustin Johnson (USA), Matthew Borchert (USA), Troy Merritt (USA) Denny McCarthy (USA) Christiaan Bezuidenhout (RSA), Louis Oosthuizen (RSA), Branden Grace (RSA), Anirban Lahiri (IND), Jinichiro Kozuma (JPN), Sergio Garcia (ESP), Jon Rahm (ESP), Adam Hadwin (CAN), Matt Jones (AUS), Min Woo Lee (AUS), Maverick McNealy (USA), Alex Beach (USA), Joel Dahmen (USA), Jhonattan Vegas (VEN)
74 - Rikuya Hoshino (JPN), Juan Sebastin Muoz (COL), Danie Van Tonder (RSA), Garrick Higgo (RSA), Tiger Woods (USA), Zach Johnson (USA), Brian Harman (USA), Jason Kokrak (USA), Hudson Swafford (USA), Cameron Champ (USA), Richard Bland (ENG), Sam Horsfield (ENG), Russell Knox (SCO), Harry Higgs (USA), Luke List (USA)
75 - Lee Westwood (ENG), Billy Horschel (USA), Brooks Koepka (USA), Lucas Glover (USA), Ryan Vermeer (USA), Kyle Mendoza (USA), Sadom Kaewkanjana (THA), Erik van Rooyen (RSA)
76 - Martin Kaymer (GER), Corey Conners (CAN), Patrick Cantlay (USA), Matthew Wolff (USA) Shaun Micheel (USA), Ryan Brehm (USA), Ian Poulter (ENG), Kim Bi-o (KOR)
77 - Takumi Kanaya (JPN), Mackenzie Hughes (CAN), Padraig Harrington (IRL), Pablo Larrazabal (ESP), Wyatt Worthington (USA), Tim Feenstra (USA), Adam Scott (AUS), Chad Ramey (USA)
78 - Nicolai Hoejgaard (DEN), Oliver Bekker (RSA), Shawn Warren (USA) Dylan Newman (USA), Colin Inglis (USA), Nic Ishee (USA), Michael Block (USA), Scott Stallings (USA), Brandon Bingaman (USA), Kim Joo-hyung (KOR), Austin Hurt (USA), Paul Dickinson (USA)
79 - Casey Pyne (USA), Carlos Ortiz (MEX), Ryosuke Kinoshita (JPN), Tyler Collet (USA), Jared Jones (USA)
81 - Zac Oakley (USA)
82 - Sean McCarty (USA)