Nombre: Katie O'Brien
País: United Kingdom
Fecha de nacimiento: 02.05.86, 40 años
altura: 166 cm
peso: 61 kg
Diestro
WTA ranking: 407
TOP posición de la clasificación: 84 (08.02.10, 76900 puntos)
Puntos: 96
Dinero del premio: 525141 $
Partidos totales: 439
ganar: 229
%: 52.16 %
País: United Kingdom
Fecha de nacimiento: 02.05.86, 40 años
altura: 166 cm
peso: 61 kg
Diestro
WTA ranking: 407
TOP posición de la clasificación: 84 (08.02.10, 76900 puntos)
Puntos: 96
Dinero del premio: 525141 $
Partidos totales: 439
ganar: 229
%: 52.16 %
| año | resumen | Difícil | Arcilla | I. difícil | Alfombra | Césped | Acrílico |
| 2011 | 13/17 | 5/5 | 0/0 | 2/5 | 1/1 | 5/6 | 0/0 |
| 2010 | 18/30 | 13/18 | 1/3 | 3/5 | 0/0 | 1/4 | 0/0 |
| 2009 | 47/25 | 15/8 | 3/5 | 22/6 | 5/2 | 2/4 | 0/0 |
| 2008 | 29/37 | 11/16 | 5/7 | 10/7 | 1/3 | 2/4 | 0/0 |
| 2007 | 42/31 | 15/15 | 0/3 | 14/6 | 6/3 | 7/4 | 0/0 |
| 2006 | 37/30 | 19/16 | 1/1 | 12/6 | 3/2 | 2/5 | 0/0 |
| 2005 | 35/26 | 13/10 | 0/0 | 17/8 | 0/2 | 5/6 | 0/0 |
| 2004 | 5/9 | 4/5 | 0/0 | 1/1 | 0/0 | 0/3 | 0/0 |
| 2003 | 2/4 | 0/1 | 0/0 | 0/2 | 0/0 | 2/1 | 0/0 |
| 2002 | 1/1 | 0/0 | 0/0 | 1/1 | 0/0 | 0/0 | 0/0 |
| TOTAL | 229/210 | 95/94 | 10/19 | 82/47 | 16/13 | 26/37 | 0/0 |
| porc. % | 52.16 % | 50.26 % | 34.48 % | 63.57 % | 55.17 % | 41.27 % | 0 % |
Katie O'Brien / programado / pasado
| No se encontraron partidos |
Katie O'Brien form / superficie: Césped
Katie O'Brien / superficie: Césped
| 20.06.11 | 1er ronda | Kimiko Date | Katie O'Brien | 6-0, 7-5 |  | match details |  London | Césped |
| 11.06.11 | c 1 | Alison Riske | Katie O'Brien | 6-2, 6-4 | | match details | Eastbourne | Césped |
| 08.06.11 | 1er ronda | Renata Voracova | Katie O'Brien | 2-6, 6-4, 6-1 | | match details | Nottingham | Césped |
| 01.06.11 | 2da ronda | Romina Oprandi | Katie O'Brien | 6-4, 3-6, 6-3 | | match details | Nottingham | Césped |
| 31.05.11 | 1er ronda | Katie O'Brien | Stefanie Voegele | 7-65, 7-66 |  | match details | ||
| 09.05.11 | 1er ronda | Rika Fujiwara | Katie O'Brien | 6-4, 0-6, 6-4 | | match details |  Kurume | Césped |
| 21.02.11 | 1/4 | Katie O'Brien | Rika Fujiwara | 2-6, 6-2, 6-1 | | match details |  Mildura | Césped |
| 21.02.11 | 1/2 | Katie O'Brien | Isabella Holland | 6-1, 6-1 | | match details | ||
| 21.02.11 | 1er ronda | Katie O'Brien | Karen Filippou | 6-3, 6-3 | | match details | ||
| 21.02.11 | fin | Su-Wei Hsieh | Katie O'Brien | 6-1, 6-2 | | match details | ||
| 21.02.11 | 2da ronda | Katie O'Brien | Yurika Sema | 6-3, 6-1 | | match details | ||
| 21.06.10 | 1er ronda | Alona Bondarenko | Katie O'Brien | 6-3, 6-710, 6-4 | | match details | London | Césped |
| 12.06.10 | c 1 | Latisha Chan | Katie O'Brien | 6-4, 7-5 | | match details | Eastbourne | Césped |
| 07.06.10 | 1er ronda | Sesil Karatantcheva | Katie O'Brien | 6-3, 6-4 | | match details | Birmingham | Césped |
| 31.05.10 | 1er ronda | Katie O'Brien | Nikola Hofmanova | 6-4, 2-6, 6-4 | | match details | Nottingham | Césped |
| 31.05.10 | 2da ronda | Carly Gullickson | Katie O'Brien | 7-63, 6-2 | | match details | ||
| 23.06.09 | 1er ronda | Iveta Benesova | Katie O'Brien | 6-2, 5-7, 6-4 | | match details | London | Césped |
| 14.06.09 | c 2 | Ekaterina Makarova | Katie O'Brien | 6-4, 6-2 | | match details | Eastbourne | Césped |
| 13.06.09 | c 1 | Katie O'Brien | Naomi Broady | 7-5, 4-6, 6-4 | | match details | ||
| 08.06.09 | 1er ronda | Melanie South | Katie O'Brien | 6-4, 1-6, 7-65 | | match details | Birmingham | Césped |
| 01.06.09 | 2da ronda | Naomi Cavaday | Katie O'Brien | 6-2, 6-3 | | match details | Nottingham | Césped |
| 01.06.09 | 1er ronda | Katie O'Brien | Svenja Weidemann | 6-4, 7-61 | | match details | ||
| 24.06.08 | 1er ronda | Shahar Peer | Katie O'Brien | 6-3, 7-5 | | match details | London | Césped |
| 16.06.08 | 1er ronda | Samantha Stosur | Katie O'Brien | 6-4, 6-3 | | match details | Eastbourne | Césped |
| 11.06.08 | 2da ronda | Yaroslava Shvedova | Katie O'Brien | 7-5, 1-6, 7-5 | | match details | Birmingham | Césped |
| 09.06.08 | 1er ronda | Katie O'Brien | Alla Kudryavtseva | 6-0, 3-6, 7-62 | | match details | ||
| 02.06.08 | 1er ronda | Katie O'Brien | Vania King | 3-6, 6-1, 6-3 | | match details | Surbiton | Césped |
| 02.06.08 | 2da ronda | Carly Gullickson | Katie O'Brien | 6-3, 6-3 | | match details | ||
| 28.06.07 | 2da ronda | Michaella Krajicek | Katie O'Brien | 6-0, 6-1 | | match details | London | Césped |
| 26.06.07 | 1er ronda | Katie O'Brien | Sandra Kloesel | 6-3, 7-5 | | match details | ||
| 20.06.07 | 2da ronda | Elena Dementieva | Katie O'Brien | 6-3, 6-4 | | match details | Eastbourne | Césped |
| 19.06.07 | 1er ronda | Katie O'Brien | Vasilisa Bardina | 7-5, 6-3 | | match details | ||
| 18.06.07 | calif. | Katie O'Brien | Jill Craybas | 7-64, 2-6, 6-2 | | match details | ||
| 17.06.07 | c 2 | Katie O'Brien | Tsvetana Pironkova | 2-6, 6-2, 6-2 | | match details | ||
| 16.06.07 | c 1 | Katie O'Brien | Meng Yuan | 7-5, 6-3 | | match details | ||
| 10.06.07 | c 1 | Sarah Borwell | Katie O'Brien | 7-61, 5-7, 7-65 | | match details | Birmingham | Césped |
| 04.06.07 | 2da ronda | Katie O'Brien | Meng Yuan | 6-74, 6-3, 6-1 | | match details | Surbiton | Césped |
| 04.06.07 | 1/4 | Ayumi Morita | Katie O'Brien | 6-0, 6-3 | | match details | ||
| 04.06.07 | 1er ronda | Katie O'Brien | Irena Pavlovic | 6-1, 6-4 | | match details | ||
| 10.07.06 | 1er ronda | Katie O'Brien | Sanaa Bhambri | 7-5, 6-3 | | match details | Felixstowe | Césped |
| 10.07.06 | 2da ronda | Melanie South | Katie O'Brien | 6-2, 3-6, 6-3 | | match details | ||
| 27.06.06 | 1er ronda | Tathiana Garbin | Katie O'Brien | 2-6, 7-62, 6-2 | | match details | London | Césped |
| 19.06.06 | 1er ronda | Francesca Schiavone | Katie O'Brien | 6-3, 6-1 | | match details | Eastbourne | Césped |
| 12.06.06 | 1er ronda | Ayumi Morita | Katie O'Brien | 6-4, 2-6, 6-1 | | match details | Birmingham | Césped |
| 05.06.06 | 1er ronda | Katie O'Brien | Sarah Coles | 6-2, 7-5 | | match details | Surbiton | Césped |
| 05.06.06 | 2da ronda | Vilmarie Castellvi | Katie O'Brien | 2-6, 7-5, 6-1 | | match details | ||
| 04.07.05 | 1/2 | Jarmila Wolfe | Katie O'Brien | 6-4, 6-4 | | match details | Felixstowe | Césped |
| 04.07.05 | 1er ronda | Katie O'Brien | Rebecca Llewellyn | 6-3, 6-3 | | match details | ||
| 04.07.05 | 2da ronda | Katie O'Brien | Holly Bagshaw | 4-6, 6-4, 6-3 | | match details | ||
| 04.07.05 | 1/4 | Katie O'Brien | Kathrin Woerle | 6-4, 6-76, 6-3 | | match details | ||
| 20.06.05 | 1er ronda | Kim Clijsters | Katie O'Brien | 6-2, 6-3 | | match details | London | Césped |
| 11.06.05 | c 1 | Katarina Srebotnik | Katie O'Brien | 6-1, 6-2 | | match details | Eastbourne | Césped |
| 05.06.05 | c 1 | Saori Obata | Katie O'Brien | 6-3, 6-2 | | match details | Birmingham | Césped |
| 30.05.05 | 1er ronda | Yoon-Jeong Cho | Katie O'Brien | 7-5, 6-2 | | match details | Surbiton | Césped |
| 23.05.05 | 2da ronda | Katie O'Brien | Claire De Gubernatis | 6-1, 7-5 | | match details | Oxford | Césped |
| 23.05.05 | 1/4 | Alice Mackenzie | Katie O'Brien | 6-2, 6-4 | | match details | ||
| 23.05.05 | 1er ronda | Katie O'Brien | Rosanna Hatch | 6-2, 6-3 | | match details | ||
| 24.06.04 | 1er ronda | Maria Sanchez Lorenzo | Katie O'Brien | 6-4, 6-4 | | match details | London | Césped |
| 21.06.04 | 1er ronda | Kateryna Volodko | Katie O'Brien | 6-2, 6-3 | | match details | Wimbledon (juniors) | Césped |
| 31.05.04 | 1er ronda | Anna Chakvetadze | Katie O'Brien | 6-2, 6-1 | | match details | Surbiton | Césped |
| 23.06.03 | 3er ronda | Emma Laine | Katie O'Brien | 6-1, 7-5 | | match details | Wimbledon (juniors) | Césped |
| 23.06.03 | 1er ronda | Katie O'Brien | Katerina Bohmova | 6-2, 0-6, 7-5 | | match details | ||
| 23.06.03 | 2da ronda | Katie O'Brien | Madalina Gojnea | 6-4, 6-2 | | match details |