Los Angeles - Texas native Jordan Spieth will find a familiar face waiting for him in round-robin play at the World Golf Championships Match Play Championship in Austin, Texas, this week in sometime US team-mate Patrick Reed.
Spieth and Reed have teamed to great effect in two Ryder Cups and last year's Presidents Cup, but will be meeting as match play opponents for the first time.
Sixteen groups of four will play round-robin matches from Wednesday through on Friday at Austin Country Club, where knockout competition begins with Saturday's round of 16.
Australian Jason Day, the 2016 champion when Austin Country Club hosted the event for the first time, beat South African Louis Oosthuizen in the final that year.
They'll meet in the group stage this time around.
Reigning champion Dustin Johnson's group includes Presidents Cup team-mate Kevin Kisner.
The top 16 ranked players are the top seeds in their respective groups, with the other spots decided by a random draw on Monday.
Spain's Jon Rahm, runner-up to Johnson last year, heads a group that also includes Kiradech Aphibarnrat, winner of the World Super 6 Perth event, Chez Reavie and Keegan Bradley.
"Certainly not an easy group," Rahm said.
Spain's Sergio Garcia, building toward his Masters title defence in April, opens in a group that includes PGA Tour Rookie of the Year Xander Schauffele, Dylan Frittelli, who won a US collegiate title for the University of Texas, and Shubhankar Sharma of India.
Sharma broke through for a European Tour victory at the Joburg Open in December and won again in Kuala Lumpur in February before challenging at the WGC Mexico Championship this month.
GROUP 1: Dustin Johnson (1), Kevin Kisner (32), Adam Hadwin (38), Bernd Wiesberger (52)
GROUP 2: Justin Thomas (2), Francesco Molinari (21), Patton Kizzire (48), Luke List (60)
GROUP 3: Jon Rahm (3), Kiradech Aphibarnrat (28), Chez Reavie (43), Keegan Bradley (63)
GROUP 4: Jordan Spieth (4), Patrick Reed (19), Haotong Li (34), Charl Schwartzel (49)
GROUP 5: Hideki Matsuyama (4), Patrick Cantlay (30), Cameron Smith (46), Yusaku Miyazato (53)
GROUP 6: Rory McIlroy (6), Brian Harman (18), Jhonattan Vegas (44), Peter Uihlein (57)
GROUP 7: Sergio Garcia (7), Xander Schauffele (20), Dylan Frittelli (41), Shubhankar Sharma (62)
GROUP 8: Jason Day (8), Louis Oosthuizen (25), Jason Dufner (42), James Hahn (56)
GROUP 9: Tommy Fleetwood (9), Daniel Berger (26), Kevin Chappell (33), Ian Poulter (58)
GROUP 10: Paul Casey (10), Matthew Fitzpatrick (31), Kyle Stanley (45), Russell Henley (51)
GROUP 11: Marc Leishman (11), Branden Grace (23), Bubba Watson (35), Julian Suri (64)
GROUP 12: Tyrrell Hatton (12), Charley Hoffman (22), Brendan Steele (36), Alexander Levy (55)
GROUP 13: Alex Noren (13), Tony Finau (29), Thomas Pieters (39), Kevin Na (61)
GROUP 14: Phil Mickelson (14), Rafa Cabrera Bello (17), Satoshi Kodaira (40), Charles Howell III (59)
GROUP 15: Pat Perez (15), Gary Woodland (24), Webb Simpson (37), Si Woo Kim (50)
GROUP 16: Matt Kuchar (16), Ross Fisher (27), Yuta Ikeda (47) Zach Johnson (54)