# 2010 Pan Pacific Swimming Championships – Women's 100 metre backstroke

The women's 100 metre backstroke competition at the 2010 Pan Pacific Swimming Championships took place on August 18 at the William Woollett Jr. Aquatics Center. The last champion was Hanae Ito of Japan.
This race consisted of two lengths of the pool, all in backstroke.

## Records

Prior to this competition, the existing world and Pan Pacific records were as follows:
| World record | Gemma Spofforth (GBR) | 58.12 | Rome, Italy | July 28, 2009 |
| Pan Pacific Championships record | Natalie Coughlin (USA) | 59.72 | Yokohama, Japan | August 24, 2002 |

## Results

All times are in minutes and seconds.
| KEY: | q | Fastest non-qualifiers | Q | Qualified | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |

### Heats

The first round was held on August 18, at 10:48.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Emily Seebohm | Australia | 59.62 | QA, CR |
| 2 | 4 | 3 | Natalie Coughlin | United States | 59.89 | QA |
| 3 | 3 | 6 | Sophie Edington | Australia | 1:00.34 | QA |
| 4 | 2 | 4 | Aya Terakawa | Japan | 1:00.41 | QA |
| 5 | 2 | 5 | Belinda Hocking | Australia | 1:00.51 | QA |
| 6 | 3 | 3 | Missy Franklin | United States | 1:00.56 | QA |
| 7 | 3 | 4 | Shiho Sakai | Japan | 1:00.58 | QA |
| 8 | 4 | 5 | Elizabeth Pelton | United States | 1:00.63 | QA |
| 9 | 4 | 6 | Miyuki Takemura | Japan | 1:00.81 | QB |
| 10 | 3 | 5 | Fabíola Molina | Brazil | 1:00.82 | QB |
| 11 | 4 | 1 | Julia Wilkinson | Canada | 1:00.87 | QB |
| 12 | 2 | 3 | Rachel Bootsma | United States | 1:01.10 | QB |
| 13 | 4 | 2 | Elizabeth Beisel | United States | 1:01.20 | QB |
| 13 | 1 | 2 | Katy Murdoch | Canada | 1:01.20 | QB |
| 15 | 1 | 6 | Marie Kamimura | Japan | 1:01.23 | QB |
| 16 | 2 | 7 | Emily Thomas | New Zealand | 1:01.55 | QB |
| 17 | 2 | 2 | Grace Loh | Australia | 1:01.62 | |
| 18 | 3 | 2 | Sinead Russell | Canada | 1:01.65 | |
| 19 | 3 | 7 | Melissa Ingram | New Zealand | 1:01.75 | |
| 20 | 1 | 4 | Dominique Bouchard | Canada | 1:02.63 | |
| 20 | 1 | 5 | Genevieve Cantin | Canada | 1:02.63 | |
| 22 | 4 | 8 | Lauren Lavigna | Canada | 1:02.64 | |
| 23 | 3 | 1 | Fernanda Alvarenga | Brazil | 1:03.72 | |
| 24 | 1 | 3 | Lau Yin-Yan | Hong Kong | 1:04.18 | |
| 25 | 2 | 1 | Hannah Riordan | Canada | 1:04.19 | |

### B Final

The B final was held on August 18, at 19:10.
| Rank | Lane | Name | Nationality | Time |
| 9 | 5 | Elizabeth Pelton | United States | 1:00.15 |
| 10 | 4 | Belinda Hocking | Australia | 1:00.65 |
| 11 | 7 | Sinead Russell | Canada | 1:01.21 |
| 12 | 3 | Miyuki Takemura | Japan | 1:01.65 |
| 13 | 2 | Emily Thomas | New Zealand | 1:01.93 |
| 14 | 6 | Katy Murdoch | Canada | 1:01.98 |
| 15 | 8 | Lau Yin-Yan | Hong Kong | 1:03.66 |
| 16 | 1 | Fernanda Alvarenga | Brazil | 1:04.29 |

### A Final

The A final was held on August 18, at 19:10.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Emily Seebohm | Australia | 59.45 | CR |
| | 6 | Aya Terakawa | Japan | 59.59 | |
| | 5 | Natalie Coughlin | United States | 59.70 | |
| 4 | 2 | Missy Franklin | United States | 1:00.16 | |
| 5 | 8 | Julia Wilkinson | Canada | 1:00.44 | |
| 6 | 3 | Sophie Edington | Australia | 1:00.54 | |
| 7 | 7 | Shiho Sakai | Japan | 1:00.68 | |
| 8 | 1 | Fabíola Molina | Brazil | 1:02.02 | |