SOUTHPORT, England — Henrik Stenson will begin defense of his British Open title alongside reigning Players champion Si Woo Kim and two-time major champion Jordan Spieth when the 146th edition of the oldest championship in golf begins Thursday at Royal Birkdale.

The three begin play at 9:47 a.m. local time (4:47 a.m. ET).

Hitting the first tee shot of the tournament at 6:35 a.m. local time will be Mark O’Meara, who won the Open here in 1998.

Padraig Harrington, who won in 2008 when the Open was last played at Birkdale, is off with Pat Perez and Thomas Pieters (4:36 a.m. ET). Reigning U.S. Open champion Brooks Koepka, who hasn’t played since he torched Erin Hills in Wisconsin to win the national championship, is playing with Hideki Matsuyama, who tied for second in the U.S. Open, and Tommy Fleetwood, who finished fourth at Erin Hills (5:09 a.m. ET).

Sergio Garcia, who won his first major at the Masters in April, is off with 2015 PGA champ Jason Day and Zach Johnson, who won the British Open at St. Andrews in 2015 (8:04 p.m. ET).

MORE GOLF:

Rory McIlroy, who has missed the cut in three of his last four starts, is off with world No. 1 Dustin Johnson and 2011 Masters champion Charl Schwartzel (9:48 a.m. ET).

Jon Rahm, who won the Irish Open in his last start, is grouped with Patrick Reed and Lee Westwood (9:59 a.m. ET). Phil Mickelson, who hasn’t won since capturing the British Open in 2013 and was runner-up in the championship last year, is playing with Francesco Molinari and Marc Leishman (10:10 a.m. ET).

All times local

6:35 a.m. — Mark O’Meara,  Chris Wood,  Ryan Moore

6:46 —  Phachara Khongwatmai,  Maverick McNealy (a),  Stuart Manley

6:57 — Stewart Cink, Sandy Lyle, Jeunghun Wang

7:08 — Paul Broadhurst,  Thongchai Jaidee, Roberto Castro

7:19 —  Tom Lehman, Byeong Hun An,  Darren Fichardt

7:30 — Soren Kjeldsen,  Billy Horschel, Danny Willett

7:41 — Matthew Fitzpatrick,  Steve Stricker,  Emiliano Grillo

7:52 — Jason Dufner,  Branden Grace, Bryson DeChambeau

8:03 —  Alex Noren, Russell Knox,  Ian Poulter

8:14 — David Duval,  Prayad Marksaeng, KT Kim

8:25 —  Younghan Song, David Horsey,  Dylan Frittelli

8:36 —  Mike Lorenzo-Vera,  Charles Howell III,  Shiv Kapur

8:47 —  Russell Henley,  Fabrizio Zanotti, Peter Uihlein

9:03 —  Alexander Levy,  Brendan Steele, Webb Simpson

9:14 —  Wesley Bryan,  Anirban Lahiri,  Alfie Plant (a)

9:25 —  Darren Clarke,  Gary Woodland, Harry Ellis (a)

9:36 —  Padraig Harrington, Pat Perez, Thomas Pieters

9:47 —  Henrik Stenson,  Si-Woo Kim, Jordan Spieth 

9:58 —  Louis Oosthuizen, Justin Rose, Justin Thomas

10:09 — Brooks Koepka,  Hideki Matsuyama, Tommy Fleetwood

10:20 —  JB Holmes, Brandt Snedeker,  Shane Lowry

10:31 —  Richard Bland,  Shaun Norris, Luca Cianchetti  (a)

10:42 —  Yikeun Chang,  Chan Kim,  Mark Foster

10:53 —  Sung-Hoon Kang,  Tony Finau,  Matthieu Pavon

11:04 —  Alexander Bjork, Joe Dean,  Robert Streb

11:15 —  Robert Dinwiddie,  Julian Suri,  Adam Hodkinson

11:36 —  Andrew Johnston, Adam Hadwin, Todd Hamilton

11:47 —  John Daly,  Adam Bland, Connor Syme (a)

11:58 —  William McGirt, Toby Tree, Jamie Lovemark

12:09 —  Matthew Griffin, Austin Connelly,  Matthew Southgate

12:20 — Cameron Smith, Bill Haas,  Callum Shinkwin

12:31 — Michael Hendry,  Brian Harman, Martin Laird

12:42 — Ernie Els, Ross Fisher, Bernd Wiesberger

12:53 —   Tyrrell Hatton, Martin Kaymer, Aaron Baddeley

1:04 —  Zach Johson, Jason Day, Sergio Garcia

1:15 — Andy Sullivan, Joost Luiten, David Lipsky

1:26 —  Rickie Fowler, Adam Scott, Paul Casey

1:37 —  Matt Kuchar, Richie Ramsay, Ryan Fox

1:48 —  Kevin Kisner, Charley Hoffman, David Drysdale

2:04 —   Jimmy Walker, Hideto Tanihara,  Thorbjorn Olesen

2:15 —  Jhonattan Vegas, Brandon Stone, Sean O’Hair

2:26 —  Daniel Berger,  Pablo  Larrazaba,  Yuta Ikeda

2:37 —  Paul Lawrie, Kevin Chappell,  Yusaku Miyazato

2:48  —  Rory McIlroy, Dustin Johnson, Charl Schwartzel

2:59 — Jon Rahm, Patrick Reed, Lee Westwood

3:10 — Phil Mickelson, Francesco Molinari, Marc Leishman

3:21 — Scott Hend, Rafael Cabrera-Bello, Bubba Watson

3:32 — Paul Waring, Kyle Stanley,  Kevin Na

3:43 —  Giwhan Kim, Xander Schauffele, Andrew Dodt

3:54 —  Haotong Li, Kent Bulle, Haydn McCullen

4:05 —   Jbe Kruger, Nick McCarthy, Ashley Hall

4:16 —  Ryan McCarthy,  Laurie Canter, Sebastian Munoz