# 2010 U.S. Senior Open

The 2010 U.S. Senior Open was a senior major golf championship and the 31st U.S. Senior Open, held July 29 to August 1 at Sahalee Country Club in Sammamish, Washington, a suburb east of Seattle. It was the first U.S. Senior Open played at the course, which hosted the PGA Championship in 1998.
World Golf Hall of Fame member Bernhard Langer won by three strokes over Seattle native Fred Couples, his second senior major championship victory in as many weeks.

## Venue
### Course layout

| Hole | Yards | Par | | Hole | Yards | Par |
| 1 | 403 | 4 | | 10 | 400 | 4 |
| 2 | 508 | 5 | | 11 | 545 | 5 |
| 3 | 415 | 4 | | 12 | 455 | 4 |
| 4 | 392 | 4 | | 13 | 170 | 3 |
| 5 | 190 | 3 | | 14 | 370 | 4 |
| 6 | 480 | 4 | | 15 | 443 | 4 |
| 7 | 420 | 4 | | 16 | 375 | 4 |
| 8 | 443 | 4 | | 17 | 212 | 3 |
| 9 | 205 | 3 | | 18 | 470 | 4 |
| Out | 3,456 | 35 | | In | 3,440 | 35 |
| Source: | Source: | Total | Total | Total | 6,896 | 70 |
* South and North nines
* Holes 6 and 18 are par fives for members

## Field

The field consisted of 156 competitors: 127 professionals and 29 amateurs. 18-hole stroke play qualifying rounds were held at several locations for players who were not already exempt.

## Round summaries
### First round

Thursday, July 29, 2010
Bruce Vaughan posted a four-under-par 66 on day one to lead by two strokes.
| Place | Player | Score | To par |
| 1 | Bruce Vaughan | 66 | −4 |
| T2 | Tim Jackson (a) | 68 | −2 |
| T2 | Loren Roberts | 68 | −2 |
| T4 | Bernhard Langer | 69 | −1 |
| T4 | Michael Allen | 69 | −1 |
| T4 | Tom Lehman | 69 | −1 |
| T4 | Naomichi Ozaki | 69 | −1 |
| T4 | Mark Calcavecchia | 69 | −1 |
| T9 | Fred Couples | 70 | E |
| T9 | Jay Haas | 70 | E |
| T9 | Scott Simpson | 70 | E |
| T9 | Tom Watson | 70 | E |

### Second round

Friday, July 30, 2010
2010 Senior Open champion Bernhard Langer shot a 68 (−2) to take a two shot lead over Tommy Armour III, John Cook, and J. R. Roth.
| Place | Player | Score | To par |
| 1 | Bernhard Langer | 69-68=137 | −3 |
| T2 | Tommy Armour III | 71-68=139 | −1 |
| T2 | John Cook | 71-68=139 | −1 |
| T2 | J. R. Roth | 73-66=139 | −1 |
| T5 | Michael Allen | 69-71=140 | E |
| T5 | Fred Couples | 70-70=140 | E |
| T5 | Tom Watson | 70-70=140 | E |
| T5 | Loren Roberts | 68-72=140 | E |
| T9 | Tom Kite | 72-69=141 | +1 |
| T9 | Scott Simpson | 70-71=141 | +1 |

### Third round

Saturday, July 31, 2010
Seattle native Fred Couples shot a five-under-par 65 in the third round to enter the final round at 205 (−5). Bernhard Langer shot a second consecutive round of 68 (−2) to share the 54-hole lead with Couples.
| Place | Player | Score | To par |
| T1 | Bernhard Langer | 69-68-68=205 | −5 |
| T1 | Fred Couples | 70-70-65=205 | −5 |
| T3 | Tom Kite | 72-69-69=210 | E |
| T3 | Lu Chien-soon | 71-71-68=211 | E |
| T5 | Michael Allen | 69-71-71=210 | +1 |
| T5 | Tommy Armour III | 71-68-72=211 | +1 |
| T5 | John Cook | 71-68-72=211 | +1 |
| T5 | Peter Senior | 73-70-68=211 | +1 |
| T9 | Loren Roberts | 68-72-72=212 | +2 |
| T9 | Scott Simpson | 70-71-71=212 | +2 |
Amateurs: Jackson (+11), Hudson (+16), Grace (+19)

### Final round

Sunday, August 1, 2010
Fred Couples birdied the par-4 1st hole to take a one stroke lead over Bernhard Langer. On the par-5 2nd hole, Couples drove his tee shot into the first cut of rough and was left with 227-yards for his second shot. He decided to lay up short of a water hazard which surrounds the front of the second green and was left with 69-yards for his third shot. Couples' third shot found the water and resulted in a triple bogey. Langer made a long birdie putt on the 2nd green to take a three shot lead over Couples. He extended his lead to four strokes with a birdie on the par-4 6th hole. After two late birdies by Couples, Langer entered the 72nd hole with a two stroke lead and converted a 7-foot par putt to win his second consecutive senior major championship by three strokes.
| Place | Player | Score | To par | Money ($) |
| 1 | Bernhard Langer | 69-68-68-67=272 | −8 | 470,000 |
| 2 | Fred Couples | 70-70-65-70=275 | −5 | 280,000 |
| T3 | Olin Browne | 73-70-70-65=278 | −2 | 145,760 |
| T3 | John Cook | 71-68-72-67=278 | −2 | 145,760 |
| 5 | Tom Watson | 70-70-75-66=281 | +1 | 96,938 |
| T6 | Michael Allen | 69-71-71-71=282 | +2 | 81,573 |
| T6 | Peter Senior | 73-70-68-71=282 | +2 | 81,573 |
| T8 | Tom Kite | 72-69-69-73=283 | +3 | 65,735 |
| T8 | Lu Chien-soon | 71-71-68-73=283 | +3 | 65,735 |
| T8 | Larry Mize | 74-69-72-68=283 | +3 | 65,735 |
Source: Amateurs: Jackson (+11), Grace (+25), Hudson (+27)

#### Scorecard

| Hole | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Par | 4 | 5 | 4 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 5 | 4 | 3 | 4 | 4 | 4 | 3 | 4 |
| Langer | −5 | −6 | −7 | −7 | −7 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 | −8 |
| Couples | −6 | −3 | −4 | −4 | −4 | −4 | −4 | −4 | −4 | −4 | −4 | −4 | −4 | −5 | −5 | −6 | −6 | −5 |
| Browne | +3 | +2 | +1 | E | E | E | −1 | −2 | −2 | −2 | −2 | −2 | −2 | −2 | −2 | −2 | −2 | −2 |
| Cook | +1 | E | E | E | E | E | E | E | +1 | +1 | E | E | E | E | E | −1 | −2 | −2 |
| Watson | +4 | +3 | +3 | +3 | +2 | +2 | +2 | +3 | +4 | +4 | +4 | +4 | +3 | +3 | +2 | +2 | +1 | +1 |
| Senior | +1 | E | E | E | +1 | +2 | +3 | +3 | +3 | +3 | +2 | +3 | +3 | +3 | +3 | +2 | +2 | +2 |
| Allen | +1 | +2 | +2 | +1 | +1 | +1 | +1 | +2 | +3 | +3 | +2 | +1 | +1 | +1 | +2 | +2 | +2 | +2 |
Cumulative tournament scores, relative to par
| Birdie | Bogey | Triple bogey+ |
Source: