The 2010 United States Open Championship was the 110th U.S. Open, held June 17–20 in Pebble Beach, California. Graeme McDowell of Northern Ireland won his first major title, one stroke ahead of runner-up Grégory Havret of France. McDowell was the first European to win the U.S. Open in forty years, since Tony Jacklin of England won in 1970. McDowell's win started a period in which four out of five U.S. Open champions between 2010–2014 were European. This was the fifth U.S. Open to be played at Pebble Beach Golf Links (it also hosted in 2000, 1992, 1982, and 1972).
 Previous course lengths for major championships
 About half the field each year consists of players who are fully exempt from qualifying for the U.S. Open. The players who qualified for the 2010 U.S. Open are listed below. Each player was classified according to the first category in which he qualified, but other categories are shown in parentheses.
 Ángel Cabrera (3,9,10,17), Michael Campbell, Jim Furyk (9,10,12,13,17), Lucas Glover (8,9,10,17), Retief Goosen (9,10,17), Geoff Ogilvy (9,10,11,17), Tiger Woods (4,5,8,9,10,13,17)
 An Byeong-hun (a), Ben Martin (a)
 Trevor Immelman, Zach Johnson (9,10,17), Phil Mickelson (5,8,9,10,12,13,17)
 Stewart Cink (9,10,17), Pádraig Harrington (5,9,10,11,17)
 Yang Yong-eun (9,10,17)
 Tim Clark (9,12,17), Sergio García (8,11,17), Henrik Stenson (8,17)
 Fred Funk
 Stephen Ames, Ricky Barnes, Matt Bettencourt, David Duval, Ross Fisher (11,17), Søren Hansen, Hunter Mahan (9,10,17), Rory McIlroy (11,12,17), Ryan Moore, Mike Weir (9,10)
 Paul Casey (11,14,17), Brian Gay (10), Dustin Johnson (10,12,17), Jerry Kelly (10), Matt Kuchar (12,17), Justin Leonard, Kevin Na (10,17), Sean O'Hair (10,17), Kenny Perry (10,17), Ian Poulter (11,14,17), John Rollins, Rory Sabbatini, John Senden (10), Steve Stricker (10,12,13,17), David Toms (10), Nick Watney (10,17)
 Luke Donald (17), Jason Dufner, Ernie Els (11,12,13,14,17), Marc Leishman, Steve Marino, Heath Slocum, Scott Verplank
 Simon Dyson, Martin Kaymer (17), Søren Kjeldsen, Ross McGowan, Francesco Molinari (17), Lee Westwood (14,17), Oliver Wilson (17)
 Robert Allenby (17), Camilo Villegas (17)
 Charl Schwartzel (17)
 Yuta Ikeda (17), Ryo Ishikawa (17)
 Michael Sim (17)
 K. J. Choi, Ben Crane, Peter Hanson, Thongchai Jaidee, Miguel Ángel Jiménez, Robert Karlsson, Graeme McDowell, Edoardo Molinari, Louis Oosthuizen, Álvaro Quirós, Adam Scott
 Vijay Singh, Tom Watson
 (a) denotes amateur
(L) denotes player advanced through local qualifying
 Thursday, June 17, 2010
 The 110th U.S. Open began on a sunny cool day on the Monterey Peninsula. Paul Casey, Shaun Micheel, and Brendon de Jonge all shot a 69 (−2) to lead after 18 holes. De Jonge holed out for eagle at the very difficult par-5 14th hole. Rafa Cabrera-Bello, K. J. Choi, Alex Čejka, Ryo Ishikawa, Mike Weir, and Ian Poulter all shot 70 (−1). The 2009 and 2010 AT&T Pebble Beach National Pro-Am winner Dustin Johnson shot an even par 71. Tiger Woods, who won the U.S. Open at Pebble Beach by 15 strokes in 2000, shot a birdie-free 74 (+3). Phil Mickelson, another of the favorites entering the tournament, struggled to a 75 (+4). This was the first time in over seven years, since the first round of the 2003 Masters, where neither Woods nor Mickelson made a birdie in a round of a major championship.
 Friday, June 18, 2010
 McDowell shot a 68 (−3) to take the 36-hole lead at 139 (−3). Casey posted a 73 (+2) to move back to even par, as did de Jonge. Shaun Micheel shot a 77 (+6), with a double-hit on a chip shot on the first hole. Woods continued to struggle, with a 72 (+1) for 146 (+4). Among those at 141 (−1) were Ernie Els, Johnson, Ishikawa, and Mickelson. Mickelson shot 66 (−5) with a front nine charge with birdies at 2, 3, 4, 6, and 8. Notable players who missed the cut (+7) were Rory McIlroy, Hunter Mahan, and two-time heart transplant survivor Erik Compton, who was playing in his first major.
 Saturday, June 19, 2010
 Johnson stormed to five-under 66 for a 207 (−6) and a three shot lead over McDowell at 210. Johnson eagled the drivable fourth hole to go with birdies on 17 and 18. Woods shot a back nine 31, with birdies on the last three holes to get back in contention in solo third place at 212 (−1). Both Grégory Havret and Els finished at even par, six shots back of Johnson. Mickelson double bogeyed the 9th hole and struggled to a 73 (+2).
 Sunday, June 20, 2010
 Overnight leader Johnson quickly dropped out of contention with a triple-bogey on the second hole and a double on the third hole. Els was tied for the lead at a part of the round, but fell back eventually. Havret remained closely in contention, but McDowell ground out a round of 74 to win his first major championship.
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 Final round
 Cumulative tournament scores, relative to par
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 36°34′05″N 121°57′00″W﻿ / ﻿36.568°N 121.950°W﻿ / 36.568; -121.950