2015 U.S. Women’s Amateur: Hannah O'Sullivan wins at Portland (Ore.) G.C.
Hannah O'Sullivan won the 2015 U.S. Women’s Amateur at Portland (Ore.) G.C. in Portland, Oregon, beating Sierra Brooks 3 & 2 in the final.
Updated October 23, 2026
Walk this draw in the U.S. Women’s Amateur room.
- Edition
- 115th
- Dates
- August 4, 2015 to August 10, 2015
- Course
- Portland (Ore.) G.C., Portland, Oregon
- Format
- stroke-play qualifying + match play
- Champion
- Hannah O'Sullivan · age 17 · United States
- Champion's title
- 1st U.S. Women’s Amateur
- Runner-up
- Sierra Brooks · age 17
- Final
- 3 & 2
- Losing semifinalists
- Mathilda Cappeliez and Bethany Wu
- Stroke-play medalist
- Angel Yin (138)
- Defending champion
- Kristen Gillman · lost in the round of 32
- Entries
- 1,303
- What winning earned
- U.S. Women's Open 2016 | U.S. Women's Amateur (10 years) | Ricoh Women's British Open (one year) | ANA Inspiration (one year) | Evian Championship (one year)
What happened at the 2015 U.S. Women’s Amateur
Hannah O'Sullivan, 3 down through 15 holes of the final, holed a 30-foot birdie at the 30th to lead and sealed a 3-and-2 win with a 4-foot par putt on the 34th green.
Anna Newell beat Lucia Gutierrez Ballon in 25 holes in the second round.
Final, Sierra Brooks v. Hannah O'Sullivan. Hannah O'Sullivan, 3 down through 15 holes of the final, holed a 30-foot birdie at the 30th to lead and sealed a 3-and-2 win with a 4-foot par putt on the 34th green.
The draw
Every match is recorded through the round of 64.
The final, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Hannah O'Sullivan | def. | Sierra Brooks | 3 & 2 |
Semifinals, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Hannah O'Sullivan | def. | Mathilda Cappeliez | 1 up |
| Sierra Brooks | def. | Bethany Wu | 4 & 2 |
Quarterfinals, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Hannah O'Sullivan | def. | Lindsey McCurdy | 1 up |
| Mathilda Cappeliez | def. | Anna Newell | 5 & 4 |
| Sierra Brooks | def. | Bronte Law | 5 & 3 |
| Bethany Wu | def. | Mika Liu | 5 & 4 |
Round of 16, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Hannah O'Sullivan | def. | Jennifer Kupcho | 4 & 3 |
| Lindsey McCurdy | def. | Caroline Inglis | 1 up |
| Anna Newell | def. | Bailey Tardy | 2 & 1 |
| Mathilda Cappeliez | def. | Elizabeth Wang | 3 & 2 |
| Sierra Brooks | def. | Maddie McCrary | won on 20th hole |
| Bronte Law | def. | Seong Eun-jeong | 4 & 2 |
| Bethany Wu | def. | Lydia Choi | 5 & 4 |
| Mika Liu | def. | Cindy Ha | 4 & 3 |
Round of 32, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Hannah O'Sullivan | def. | Justine Dreher | 7 & 6 |
| Jennifer Kupcho | def. | Haley Moore | won on 19th hole |
| Caroline Inglis | def. | Annie Dulman | 1 up |
| Lindsey McCurdy | def. | Kristen Gillman | 4 & 3 |
| Bailey Tardy | def. | Hannah Green | won on 19th hole |
| Anna Newell | def. | Lucia Gutierrez Ballon | won on 25th hole |
| Mathilda Cappeliez | def. | Kenzie Neisen | 4 & 3 |
| Elizabeth Wang | def. | Wanasa Zhou | 2 & 1 |
| Maddie McCrary | def. | Vanessa Ha | 3 & 2 |
| Sierra Brooks | def. | Hailee Cooper | 1 up |
| Bronte Law | def. | Gaby Lopez | 2 & 1 |
| Seong Eun-jeong | def. | Alice Jo | 5 & 3 |
| Lydia Choi | def. | Malia Nam | 1 up |
| Bethany Wu | def. | Laura Restrepo | 3 & 1 |
| Mika Liu | def. | Mariel Galdiano | 1 up |
| Cindy Ha | def. | Elizabeth Tong | 2 up |
Round of 64, 2015 U.S. Women’s Amateur
| Winner | Beaten | Result | |
|---|---|---|---|
| Justine Dreher | def. | Angel Yin | 5 & 4 |
| Hannah O'Sullivan | def. | Haley Mills | 7 & 6 |
| Haley Moore | def. | Kelly Grassel | 1 up |
| Jennifer Kupcho | def. | Aliea Clark | 4 & 3 |
| Caroline Inglis | def. | Alice Chen | 1 up |
| Annie Dulman | def. | Hannah Wood | 3 & 2 |
| Kristen Gillman | def. | Kelly Su | 2 up |
| Lindsey McCurdy | def. | Binny Lee | 2 & 1 |
| Hannah Green | def. | Brigitte Dunne | 3 & 2 |
| Bailey Tardy | def. | Dylan Kim | 1 up |
| Anna Newell | def. | Cathleen Santoso | 5 & 4 |
| Lucia Gutierrez Ballon | def. | Cheyenne Knight | 2 & 1 |
| Kenzie Neisen | def. | Maria Fassi | won on 20th hole |
| Mathilda Cappeliez | def. | Soo Jin Lee | 1 up |
| Wanasa Zhou | def. | Molly Skapik | 6 & 4 |
| Elizabeth Wang | def. | Mariah Stackhouse | 1 up |
| Vanessa Ha | def. | Jennifer Hahn | 4 & 3 |
| Maddie McCrary | def. | Andrea Lee | 4 & 3 |
| Hailee Cooper | def. | Taylor Totland | won on 20th hole |
| Sierra Brooks | def. | Ana Paula Valdes | 2 & 1 |
| Gaby Lopez | def. | Samantha Wagner | 5 & 3 |
| Bronte Law | def. | Maddie Szeryk | 3 & 2 |
| Alice Jo | def. | Muni He | 2 & 1 |
| Seong Eun-jeong | def. | Céline Boutier | 1 up |
| Lydia Choi | def. | Nelly Korda | 1 up |
| Malia Nam | def. | Rong Ji | 2 up |
| Bethany Wu | def. | Emilie Alonso | 2 & 1 |
| Laura Restrepo | def. | Waverly Whiston | 5 & 3 |
| Mariel Galdiano | def. | Kimberly Mitchell | 7 & 5 |
| Mika Liu | def. | Lauren Kim | won on 19th hole |
| Cindy Ha | def. | Aneka Seumanutafa | 1 up |
| Elizabeth Tong | def. | Magdalena Simmermacher | 6 & 4 |
How this was built
Every value is shown as recorded in GNN's U.S. Women’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-womens-amateur.json.
Sources
- https://rulesworkshops.usga.org/content/dam/usga/pdf/media-resources/2026-media-guide/26WomensAmateur.pdf
- https://championships.usga.org/uswomensamateur/u-s--women-s-amateur-champions.html
- https://www.usga.org/content/usga/home-page/articles/2015/08/o-sullivan-wins-2015-u-s--women-s-amateur.html
- https://scores.usga.org/2015/WomensAmateur/match6.json
- https://en.wikipedia.org/wiki/U.S._Women%27s_Amateur