Defending champion Rory McIlroy has been grouped with Luke Donald and Lee Westwood for the first two rounds of the US Open at Olympic Club in San Francisco.
The trio, who occupy the top three slots in the world rankings, have an afternoon tee-time on day one and head out at 1329 local time (2129 BST).
World number one Donald and number two Westwood will be looking for their first major while McIlroy is bidding to follow up his incredible eight-shot victory at Congressional 12 months ago.
In another hugely eye-catching group, triple US Open champion Tiger Woods will tee off with four-time major winner Phil Mickelson and new Masters champ Bubba Watson.
The American trio go off in the morning wave at 0733 from the ninth tee.
Due to the proximity of the ninth tee to the Olympic Clubhouse, the USGA will send players off from the first and ninth tees (instead of the 10th) during the first two rounds.
In other notable groupings, Rickie Fowler tees off with fellow American Dustin Johnson and Japan's Ryo Ishikawa at 1358 while 2010 US Open winner Graeme McDowell, Sergio Garcia and 2003 champion Jim Furyk are in the group behind McIlroy, Donald and Westwood and begin at 1340.
Two groups later at 1402, a trio of former champions - Ernie Els (1994 and 1997), Geoff Ogilvy (2006) and Angel Cabrera (2007) - get their bids under way.
Justin Rose is also an afternoon starter and goes off with Martin Kaymer and Hunter Mahan from the ninth tee at 1325.
Shane Bertsch, Martin Flores and Tommy Biershenk are the opening three-ball and get the tournament under way from the ninth at 0700.
Groupings and starting times for the opening round of the US Open (all times are local; BST is 8hrs ahead):
7:15 a.m.: Scott Langley, Steve Lebrun, Beau Hossler (a)
7:26 a.m: Jason Bohn, Raphael Jacquelin, JB Park
7:37 a.m.: Michael Thompson, TBD, Steve Marino
7:48 a.m.: Brendan Jones, George Coetzee, Gregory Bourdy
7:59 a.m.: Patrick Cantlay (a), Jonathan Byrd, Kyle Stanley
8:10 a.m.: Retief Goosen, Vijay Singh, Zach Johnson
8:21 a.m.: Paul Casey, Hiroyuki Fujita, Mark Wilson
8:32 a.m.: Adam Scott, Keegan Bradley, Webb Simpson
8:43 a.m.: Tim Clark, Toru Taniguchi, Rod Pampling
8:54 a.m.: Francesco Molinari, Bo Van Pelt, Peter Hanson
9:05 a.m.: DA Points, Dong-Hwan Lee, Kevin Streelman
9:16 a.m.: Edward Loar, Paul Claxton, Alistair Presnell
9:27 a.m.: Mark McCormick, Nick Sherwood (a), Cole Howard
7:00 a.m.: Shane Bertsch, Martin Flores, Tommy Biershenk
7:11 a.m.: Scott Piercy, Matthew Baldwin, Matt Bettencourt
7:22 a.m.: Thomas Bjorn, Kevin Na, Branden Grace
7:33 a.m.: Phil Mickelson, Tiger Woods, Bubba Watson
7:44 a.m.: Joe Ogilvie, Stephen Ames, Tim Herron
7:55 a.m.: Davis Love III, Padraig Harrington, David Toms
8:06 a.m.: Carl Pettersson, Charl Schwartzel, Charles Howell III
8:17 a.m.: Robert Karlsson, Bob Estes, Robert Rock
8:28 a.m.: KJ Choi, YE Yang, KT Kim
8:39 a.m.: Fredrik Jacobson, Robert Garrigus, Alexander Noren
8:50 a.m.: Gonzalo Fernandez-Castano, Sang-Moon Bae, Rafael Cabrera-Bello
9:01 a.m.: Marc Warren, Anthony Summers, Michael Allen
9:12 a.m.: Hunter Hamrick, Tim Weinhart, Scott Smith
12:45 p.m.: Casey Martin, Cameron Wilson (a), Dennis Miller
12:56 p.m.: Jim Herman, William Lunde, David Mathis
1:07 p.m.: Nicolas Colsaerts, Charlie Wi, Simon Dyson
1:18 p.m.: Alvaro Quiros, Gary Woodland, John Senden
1:29 p.m.: Rory McIlroy, Luke Donald, Lee Westwood
1:40 p.m.: Jim Furyk, Sergio Garcia, Graeme McDowell
1:51 p.m.: Stewart Cink, Trevor Immelman, Lucas Glover
2:02 p.m.: Ernie Els, Geoff Ogilvy, Angel Cabrera
2:13 p.m.: Martin Laird, Ben Crane, Anders Hansen
2:24 p.m.: Matteo Manassero, Aaron Baddeley, Miguel Angel Jimenez
2:35 p.m.: Brian Harman, TBD, Mikko Ilonen
2:46 p.m.: Brice Garnett, TBD, Jesse Mueller
2:57 p.m.: Brian Rowell, Alberto Sanchez (a), Brian Gaffney
12:30 p.m.: John Peterson, Morgan Hoffmann, Aaron Watkins
12:41 p.m.: Jeff Curl, Nicholas Thompson, Casey Wittenberg
12:52 p.m.: Soren Kjeldsen, Chez Reavie, Peter Lawrie
1:03 p.m.: Michael Campbell, Olin Browne, Joe Durant
1:14 p.m.: Bill Haas, Nick Watney, Brandt Snedeker
1:25 p.m.: Martin Kaymer, Hunter Mahan, Justin Rose
1:36 p.m.: Steve Stricker, Ian Poulter, Matt Kuchar
1:47 p.m.: Jason Day, Louis Oosthuizen, Jason Dufner
1:58 p.m.: Rickie Fowler, Ryo Ishikawa, Dustin Johnson
2:09 p.m.: Hunter Haas, Tadahiro Takayama, Lee Slattery
2:20 p.m.: Alex Cejka, Kevin Chappell, Blake Adams
2:31 p.m.: James Hahn, Darron Stiles, Roberto Castro
2:42 p.m.: Brooks Koepka (a), TBD, Samuel Osborne