Heading into the U.S. Open, many fans were hoping to see rivals Bryson DeChambeau and Brooks Koepka square off against one another. The two are involved in a prolonged, ever-escalating feud, which was most recently on display at the PGA Championship.

Unfortunately, they won’t be playing together. Koepka was paired with Collin Morikawa and Justin Thomas while DeChambeau will play with Hideki Matsuyama and Tyler Strafaci.

Other top groups include world No. 1 Dustin Johnson playing with Rory McIlroy (11) and Justin Rose (42) while tournament favorite and world No. 3 Jon Rahm will play with Patrick Reed (8) and Marc Leishman (45).

Here’s a full breakdown of all the groups and featured groups for the first two rounds of the 2021 U.S. Open.

MORE: Full betting guide to the 2021 U.S. Open

Thursday, June 17

Brooks Koepka, Justin Thomas, Collin Morikawa - 10:25 a. m. Max Homa, Xander Schauffele, Phil Mickelson - 10:45 a. m. Hideki Matsuyama, Bryson DeChambeau, Tyler Strafaci - 4:10 p. m. Dustin Johnson, Rory McIlroy, Justin Rose - 4:25 p. m.

Friday, June 18

Hideki Matsuyama, Bryson DeChambeau, Tyler Strafaci - 10:25 a. m. Dustin Johnson, Rory McIlroy, Justin Rose - 10:45 a. m. Brooks Koepka, Justin Thomas, Collin Morikawa - 4:10 p. m. Max Homa, Xander Schauffele, Phil Mickelson - 4:25 p. m.

U.S. Open Championship tee times & pairings

The 2021 U.S. Open Championship is scheduled to start with Sahith Theegala, Edoardo Molinari and Greyson Sigg teeing off on Hole 1 at 9:45 a.m. ET. Below are the full tee times for Rounds 1 and 2 of the third major on golf’s calendar for the 2021 season.

Round 1: Thursday, June 17

First Tee

10th Tee

Second Round: Friday, June 18

First Tee

10th Tee