A star-studded group that shares 10 major championship titles between the three of them are set to take on Los Angeles Country Club together for the first two rounds of this week's US Open.
McIlroy and Koepka make up two of the most dominate players of the past decade in men's professional golf, and the competition between the two of them continues to heat up amid the on-going LIV Golf-PGA Tour saga.
McIlroy, ranked No. 3 in the world, is the star of the PGA Tour and the face of those who stayed 'loyal' to commissioner Jay Monahan.
While Koepka shocked the golf world when shortly after last year's US Open, he was announced as one of LIV Golf's newest members.
The American notably snapped at reporters for throwing a "black cloud" over the major when asked about LIV Golf last year at The Country Club in Massachusetts.
However, since then he's regained his form - becoming the first LIV player to win twice in the history of the league.
Last month he notched another new milestone, as he became the first player to win a major championship as a LIV Golf member when he won the PGA Championship for his fifth major.
It's one more major than McIlroy, who's been searching for his fifth for nearly a decade.
Here's a full look at the list of R1 and R2 tee times at the 2023 US Open:
US Open Tee Times: R1/R2 (Times displayed in EST)
No. 1/No. 10 tee
- 9:45 a.m./3:15 p.m. - Omar Morales (a), Deon Germishuys, Jacob Solomon
- 9:56 a.m./3:26 p.m. - Ryan Gerard, Yuto Katsuragawa, Michael Brennan (a)
- 10:07 a.m./3:37 p.m. - Hayden Buckley, Adam Svensson, Pablo Larrazabal
- 10:18 a.m./3:48 p.m. - Carson Young, Dylan Wu, Roger Sloan
- 10:29 a.m./3:59 p.m. - Ryo Ishikawa, Kevin Streelman, Matthieu Pavon
- 10:40 a.m./4:10 p.m. - Shane Lowry, Justin Thomas, Tommy Fleetwood
- 10:51 a.m./4:21 p.m. - Sungjae Im, K.H. Lee, J.T. Poston
- 11:02 a.m./4:32 p.m - Gary Woodland, Adam Scott, Corey Conners
- 11:13 a.m./4:43 p.m - Collin Morikawa, Max Homa, Scottie Scheffler
- 11:24 a.m./4:54 p.m - Denny McCarthy, Joel Dahmen, Adam Hadwin
- 11:35 a.m./5:05 p.m. - Matthew McClean (a), Seamus Power, Ryan Fox
- 11:46 a.m./5:16 p.m. - Mac Meissner, Barclay Brown (a), Gunn Charoenkul
- 11:57 a.m./5:27 p.m. - Alexander Yang (a), Jesse Schutte, Andy Svoboda
- 3:15 p.m./9:45 a.m. - Brent Grant, Vincent Norrman, Charley Hoffman
- 3:26 p.m./9:56 a.m. - Simon Forsström, Carlos Ortiz, Maxwell Moldovan (a)
- 3:37 p.m./10:07 a.m. - Eric Cole, Thriston Lawrence, Adam Schenk
- 3:48 p.m./10:18 a.m. - Luke List, Wilco Nienaber, Alejandro Del Rey
- 3:59 p.m./10:29 a.m. -. Adrian Meronk, Harris English, Joaquin Niemann
- 4:10 p.m./10:40 a.m. - Alex Noren, Wyndham Clark, Austin Eckroat
- 4:21 p.m./10:51 a.m. - Kurt Kitayama, Cam Davis, Russell Henley
- 4:32 p.m./11:02 a.m. - Cameron Smith, Sam Bennett, Matt Fitzpatrick
- 4:43 p.m./11:13 a.m. - Billy Horschel, Chris Kirk, Brian Harman
- 4:54 p.m./11:24 a.m. - Brooks Koepka, Hideki Matsuyama, Rory McIlroy
- 5:05 p.m./11:35 a.m. - Sebastián Muñoz, Nick Taylor, Taylor Montgomery
- 5:16 p.m./11:46 a.m. - Olin Browne Jr., David Puig, Karl Vilips (a)
- 5:27 p.m./11:57 a.m. - Corey Pereira, Isaac Simmons (a), J.J. Grey
No. 10/No. 1 tee
- 9:45 a.m./3:15 p.m. - Berry Henson, Ryutaro Nagano, Hank Lebioda
- 9:56 a.m./3:26 p.m. - Michael Kim, Jordan Smith, Wenyi Ding (a)
- 10:07 a.m./3:37 p.m. - Scott Stallings, Preston Summerhays (a), Lucas Herbert
- 10:18 a.m./3:48 p.m. - Jens Dantorp, Patrick Rodgers, Ryan Armour
- 10:29 a.m./3:59 p.m - Thomas Pieters, Aaron Wise, Gordon Sargent (a)
- 10:40 a.m./4:10 p.m. - Bryson DeChambeau, Francesco Molinari, Tyrrell Hatton
- 10:51 a.m./4:21 p.m. - Tom Hoge, Sergio Garcia, Sepp Straka
- 11:02 a.m./4:32 p.m - Justin Rose, Rickie Fowler, Jason Day
- 11:13 a.m./4:43 p.m - Patrick Reed, Matt Kuchar, Si Woo Kim
- 11:24 a.m./4:54 p.m - Xander Schauffele, Viktor Hovland, Jon Rahm
- 11:35 a.m./5:05 p.m. - Martin Kaymer, Stewart Cink, Michael Thorbjornsen (a)
- 11:46 a.m./5:16 p.m. - David Horsey, Brendan Valdez (a), Paul Barjon
- 11:57 a.m./5:27 p.m. - Jordan Gumberg, Kyle Mueller, Bastien Amat (a)
- 3:15 p.m./9:45 a.m. - Ross Fisher, Nico Echavarria, Paul Haley II
- 3:26 p.m./9:56 a.m. - Nick Dunlap (a), Nick Hardy, Sam Stevens
- 3:37 p.m./10:07 a.m. - Taylor Pendrith, Aldrich Potgieter (a), Romain Langasque
- 3:48 p.m./10:18 a.m. - Andrew Putnam, Victor Perez, Abraham Ancer
- 3:59 p.m./10:29 a.m. - Phil Mickelson, Padraig Harrington, Keegan Bradley
- 4:10 p.m./10:40 a.m. - Mito Pereira, Emiliano Grillo, Mateo Fernandez de Oliveira (a)
- 4:21 p.m./10:51 a.m. - Tom Kim, Sahith Theegala, Cameron Young
- 4:32 p.m./11:02 a.m. - Sam Burns, Dustin Johnson, Keith Mitchell
- 4:43 p.m./11:13 a.m. - Tony Finau, Jordan Spieth, Patrick Cantlay
- 4:54 p.m./11:24 a.m. - Davis Thompson, Min Woo Lee, Justin Suh
- 5:05 p.m./11:35 a.m. - Taylor Moore, Mackenzie Hughes, Ben Carr (a)
- 5:16 p.m./11:46 a.m. - Patrick Cover, David Nyfjall (a), Frankie Capan III
- 5:27 p.m./11:57 a.m. - Austen Truslow, Christian Cavaliere (a), Alex Schaake