| Competition | 2010 Pan Pacific Swimming Championships | 
|---|---|
| Venue | Irvine | 
| Held | 19 August 2010 | 
| Status | Medal | 
| Competitors | 49 | 
| Countries | 7 | 
| Pos | Athlete(s) | Country | Preliminary Round | Final | ||
|---|---|---|---|---|---|---|
| 🥇 | Natalie Coughlin | 54.09 (2 h1) | 53.67 (1 FA) | |||
| 🥈 | Emily Seebohm | 54.65 (8 h1) | 53.96 (=2 FA) | |||
| 🥈 | Dana Vollmer | 54.01 (1 h1) | 53.96 (=2 FA) | |||
| 4 | Yolane Kukla | 54.17 (3 h1) | 54.02 (4 FA) | |||
| 5 | Victoria Poon | 54.44 (5 h1) | 54.45 (5 FA) | |||
| 6 | Haruka Ueda | 54.93 (10 h1) | 54.93 (6 FA) | |||
| 7 | Hannah Wilson | 55.24 (16 h1) | 55.32 (7 FA) | |||
| 8 | Hayley Palmer | 55.42 (18 h1) | 56.04 (8 FA) | |||
| 9 | Jessica Hardy | 54.35 (4 h1) | 54.16 (1 FB) | |||
| 10 | Alicia Coutts | 54.79 (9 h1) | 54.77 (2 FB) | |||
| 11 | Yayoi Matsumoto | 55.54 (22 h1) | 55.22 (3 FB) | |||
| 12 | Tatiana Lemos | 55.52 (21 h1) | 55.28 (4 FB) | |||
| 13 | Erica Morningstar | 55.64 (23 h1) | 55.61 (5 FB) | |||
| 14 | Tomoko Hagiwara | 55.73 (26 h1) | 55.95 (6 FB) | |||
| 15 | Flávia Delaroli | 56.40 (=34 h1) | 56.21 (7 FB) | |||
| 16 | Sinéad Russell | 56.02 (33 h1) | 56.23 (8 FB) | |||
| 17 | Amanda Weir | 54.50 (6 h1) | — | |||
| 18 | Kara Lynn Joyce | 54.59 (7 h1) | — | |||
| 19 | Felicity Galvez | 55.02 (11 h1) | — | |||
| 20 | Kelly Stubbins | 55.06 (12 h1) | — | |||
| =21 | Marieke Guehrer | 55.17 (=13 h1) | — | |||
| =21 | Missy Franklin | 55.17 (=13 h1) | — | |||
| 23 | Allison Schmitt | 55.19 (15 h1) | — | |||
| 24 | Alice Mills | 55.33 (17 h1) | — | |||
| 25 | Meagen Nay | 55.43 (19 h1) | — | |||
| 26 | Morgan Scroggy | 55.46 (20 h1) | — | |||
| 27 | Madison Kennedy | 55.67 (24 h1) | — | |||
| 28 | Angie Bainbridge | 55.70 (25 h1) | — | |||
| 29 | Hanae Ito | 55.83 (27 h1) | — | |||
| 30 | Geneviève Saumur | 55.89 (28 h1) | — | |||
| 31 | Tash Hind | 55.90 (29 h1) | — | |||
| 32 | Christine Magnuson | 55.94 (30 h1) | — | |||
| 33 | Elizabeth Pelton | 55.96 (31 h1) | — | |||
| 34 | Bronte Barratt | 56.01 (32 h1) | — | |||
| 35 | Samantha Cheverton | 56.40 (=34 h1) | — | |||
| 36 | Alexandra Gabor | 56.41 (36 h1) | — | |||
| =37 | Amaka Gessler | 56.48 (=37 h1) | — | |||
| =37 | Katie Hoff | 56.48 (=37 h1) | — | |||
| 39 | Hannah Riordan | 56.53 (39 h1) | — | |||
| 40 | Penelope Marshall | 56.55 (40 h1) | — | |||
| 41 | Julyana Kury | 56.61 (41 h1) | — | |||
| =42 | Audrey Lacroix | 56.67 (=42 h1) | — | |||
| =42 | Barbara Jardin | 56.67 (=42 h1) | — | |||
| 44 | Kathleen Hersey | 56.78 (44 h1) | — | |||
| 45 | Mackenzie Downing | 56.84 (45 h1) | — | |||
| 46 | Lauren Boyle | 56.96 (46 h1) | — | |||
| 47 | Risa Sekine | 57.01 (47 h1) | — | |||
| 48 | Akane Hoshi | 58.12 (48 h1) | — | |||
| 49 | Manuella Lyrio | 58.26 (49 h1) | — | |||
| DNS | Steph RiceDNS | — (DNS h1) | — | |||
| DNS | Sally FosterDNS | — (DNS h1) | — | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Natalie Coughlin | 53.67 | ||
| =2 | Emily Seebohm | 53.96 | ||
| =2 | Dana Vollmer | 53.96 | ||
| 4 | Yolane Kukla | 54.02 | ||
| 5 | Victoria Poon | 54.45 | ||
| 6 | Haruka Ueda | 54.93 | ||
| 7 | Hannah Wilson | 55.32 | ||
| 8 | Hayley Palmer | 56.04 | 
| Pos | Athlete(s) | Country | Mark | |
|---|---|---|---|---|
| 1 | Jessica Hardy | 54.16 | ||
| 2 | Alicia Coutts | 54.77 | ||
| 3 | Yayoi Matsumoto | 55.22 | ||
| 4 | Tatiana Lemos | 55.28 | ||
| 5 | Erica Morningstar | 55.61 | ||
| 6 | Tomoko Hagiwara | 55.95 | ||
| 7 | Flávia Delaroli | 56.21 | ||
| 8 | Sinéad Russell | 56.23 |