2003 U.S. Amateur: Nick Flanagan wins at Oakmont Country Club
Nick Flanagan won the 2003 U.S. Amateur at Oakmont Country Club in Oakmont, Pennsylvania, beating Casey Wittenberg won on 37th hole in the final.
Updated October 22, 2026
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- Edition
- 103rd
- Dates
- August 18, 2003 to August 24, 2003
- Course
- Oakmont Country Club, Oakmont, Pennsylvania
- Stroke-play co-host
- Pittsburgh F.C., Blawnox, Pa.
- Format
- stroke-play qualifying (36 holes) + match play
- Champion
- Nick Flanagan · age 19 · Australia
- Champion's title
- 1st U.S. Amateur
- Runner-up
- Casey Wittenberg · age 18
- Final
- won on 37th hole
- Losing semifinalists
- Lee Williams and David Oh
- Stroke-play medalist
- J. B. Holmes (138)
- Defending champion
- Ricky Barnes · did not play (not in USGA stroke-play results)
- Entries
- 7,541
- What winning earned
- U.S. Open exemption (2004); Masters invitation (historically extended, if amateur); The Open exemption (2004)
What happened at the 2003 U.S. Amateur
Final: Flanagan led 4 up after the morning 18, Wittenberg squared the match with winning pars on the 33rd and 36th holes, and Flanagan won the 37th (Oakmont No. 10) with a par to become the first Australian champion in 100 years.
Stroke play: Flanagan had to birdie his 36th hole of qualifying to reach a 14-man playoff for the final match-play places.
The draw
Every match is recorded through the round of 64.
The final, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Nick Flanagan | def. | Casey Wittenberg | won on 37th hole |
Semifinals, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Casey Wittenberg | def. | Lee Williams | 5 & 4 |
| Nick Flanagan | def. | David Oh | 1 up |
Quarterfinals, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Lee Williams | def. | Patrick Carter | 4 & 3 |
| Casey Wittenberg | def. | George Zahringer | 1 up |
| Nick Flanagan | def. | Jerry Courville Jr. | 1 up |
| David Oh | def. | Bill Haas | 2 & 1 |
Round of 16, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Patrick Carter | def. | Michael McDermott | 2 & 1 |
| Lee Williams | def. | Gregg Jones | 4 & 3 |
| Casey Wittenberg | def. | Adam Rubinson | won on 20th hole |
| George Zahringer | def. | J. J. Killeen | 2 & 1 |
| Jerry Courville Jr. | def. | Todd White | 4 & 3 |
| Nick Flanagan | def. | Jason Hartwick | 2 & 1 |
| David Oh | def. | Matt Kohn | 6 & 5 |
| Bill Haas | def. | Zach Atkinson | 2 & 1 |
Round of 32, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Michael McDermott | def. | J. B. Holmes | 1 up |
| Patrick Carter | def. | Parker McLachlin | 1 up |
| Gregg Jones | def. | Tom Glissmeyer | 7 & 5 |
| Lee Williams | def. | Chris Botsford | 4 & 3 |
| Casey Wittenberg | def. | Camilo Villegas | 2 & 1 |
| Adam Rubinson | def. | Stuart Moore | 2 up |
| J. J. Killeen | def. | Brock Mackenzie | 4 & 3 |
| George Zahringer | def. | Korey Mahoney | 4 & 2 |
| Jerry Courville Jr. | def. | Billy Hurley | 1 up |
| Todd White | def. | Peter Tomasulo | 2 & 1 |
| Jason Hartwick | def. | Travis Johnson | 3 & 1 |
| Nick Flanagan | def. | Andrew Pratt | 2 & 1 |
| David Oh | def. | Trip Kuehne | 3 & 1 |
| Matt Kohn | def. | Nate Lashley | 1 up |
| Zach Atkinson | def. | Steve Slayden | 2 & 1 |
| Bill Haas | def. | Josh Persons | 3 & 1 |
Round of 64, 2003 U.S. Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| J. B. Holmes | def. | Rick Reinsberg | 6 & 4 |
| Michael McDermott | def. | Luke Bakke | 2 up |
| Patrick Carter | def. | Andrew Svoboda | 1 up |
| Parker McLachlin | def. | Greg Reynolds | 3 & 2 |
| Gregg Jones | def. | Brandt Snedeker | 4 & 3 |
| Tom Glissmeyer | def. | Randy Nichols | 5 & 3 |
| Lee Williams | def. | Ryan Moore | 1 up |
| Chris Botsford | def. | Kenny Cook | 3 & 2 |
| Camilo Villegas | def. | Terrence Miskell | 2 up |
| Casey Wittenberg | def. | Bill Drohen | 5 & 3 |
| Stuart Moore | def. | Nicholas Thompson | 4 & 3 |
| Adam Rubinson | def. | Brandon Knaub | won on 19th hole |
| Brock Mackenzie | def. | Mark Christensen | 6 & 5 |
| J. J. Killeen | def. | Chris Erwin | 4 & 2 |
| George Zahringer | def. | Alex Hamilton | 1 up |
| Korey Mahoney | def. | James Vargas | 2 up |
| Billy Hurley | def. | Spencer Levin | 4 & 3 |
| Jerry Courville Jr. | def. | Shawn Stefani | 2 & 1 |
| Peter Tomasulo | def. | Don DuBois | 1 up |
| Todd White | def. | Jarrod Gardner | won on 19th hole |
| Jason Hartwick | def. | Bruce McDonald | 5 & 4 |
| Travis Johnson | def. | Marc Lawless | 1 up |
| Nick Flanagan | def. | Steve Bendt | 1 up |
| Andrew Pratt | def. | Paul Polinsky | 6 & 5 |
| Trip Kuehne | def. | Ty Harris | 1 up |
| David Oh | def. | David Robinson | 4 & 3 |
| Matt Kohn | def. | James Lee | 1 up |
| Nate Lashley | def. | Steve Conway | 2 up |
| Steve Slayden | def. | Jay Reynolds | 1 up |
| Zach Atkinson | def. | William McGirt | 2 & 1 |
| Josh Persons | def. | Blake Sattler | 2 & 1 |
| Bill Haas | def. | Jessie Mudd | 7 & 5 |
How this was built
Every value is shown as recorded in GNN's U.S. Amateur data set (research collected through October 20, 2026). "unknown" means no source confirmed it; nothing is estimated. Where sources disagree, the USGA's own record is used.
Data: us-amateur.json.