# 1999 Pan Pacific Swimming Championships – Women's 100 metre backstroke

The women's 100 metre backstroke competition at the 1999 Pan Pacific Swimming Championships took place on August 23–24 at the Sydney International Aquatic Centre. The last champion was Mai Nakamura 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 | He Cihong (CHN) | 1:00.16 | Rome, Italy | September 10, 1994 |
| Pan Pacific Championships record | Janie Wagstaff (USA) | 1:01.00 | Edmonton, Canada | August 22, 1991 |

## 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 23.
| Rank | Name | Nationality | Time | Notes |
| 1 | Noriko Inada | Japan | 1:02.14 | Q |
| 2 | Mai Nakamura | Japan | 1:02.49 | Q |
| 3 | Barbara Bedford | United States | 1:02.57 | Q |
| 4 | Erin Gammel | Canada | 1:02.85 | Q |
| 5 | Dyana Calub | Australia | 1:03.18 | Q |
| 6 | Elli Overton | Australia | 1:03.19 | Q |
| 7 | Miki Nakao | Japan | 1:03.24 | Q |
| 8 | Kelly Stefanyshyn | Canada | 1:03.60 | Q |
| 9 | Charlene Wittstock | South Africa | 1:03.72 | Q |
| 10 | Giaan Rooney | Australia | 1:03.73 | Q |
| 11 | Danielle Lewis | Australia | 1:03.77 | Q |
| 12 | Lia Oberstar | United States | 1:03.95 | Q |
| 13 | Choi Soo-min | South Korea | 1:04.20 | Q |
| 14 | Nikki Tanner | New Zealand | 1:04.58 | Q |
| 15 | Monique Robins | New Zealand | 1:04.97 | Q |
| 16 | Megan McMahon | Australia | 1:05.69 | Q |
| 17 | Renate du Plessis | South Africa | 1:06.02 | |
| 18 | Helen Norfolk | New Zealand | 1:07.59 | |
| 19 | Caroline Pickering | Fiji | 1:07.85 | |
| 20 | Carissa Thompson | New Zealand | 1:07.90 | |

### Semifinals

The semifinals were held on August 23.
| Rank | Name | Nationality | Time | Notes |
| 1 | Mai Nakamura | Japan | 1:02.07 | Q |
| 2 | Noriko Inada | Japan | 1:02.27 | Q |
| 3 | Barbara Bedford | United States | 1:02.29 | Q |
| 4 | Erin Gammel | Canada | 1:02.41 | Q |
| 5 | Miki Nakao | Japan | 1:02.89 | Q |
| 6 | Kelly Stefanyshyn | Canada | 1:03.17 | Q |
| 7 | Dyana Calub | Australia | 1:03.18 | Q |
| 8 | Elli Overton | Australia | 1:03.20 | Q |
| 9 | Giaan Rooney | Australia | 1:03.37 | |
| 10 | Lia Oberstar | United States | 1:03.54 | |
| 11 | Danielle Lewis | Australia | 1:03.59 | |
| 12 | Charlene Wittstock | South Africa | 1:03.60 | |
| 13 | Nikki Tanner | New Zealand | 1:04.18 | |
| 14 | Choi Soo-min | South Korea | 1:04.20 | |
| 15 | Monique Robins | New Zealand | 1:04.73 | |
| 16 | Renate du Plessis | South Africa | 1:05.84 | |

### Final

The final was held on August 24.
| Rank | Lane | Nationality | Time | Notes |
| | Dyana Calub | Australia | 1:01.51 | CWR |
| | Mai Nakamura | Japan | 1:01.51 | |
| | Barbara Bedford | United States | 1:01.76 | |
| 4 | Noriko Inada | Japan | 1:01.79 | |
| 5 | Erin Gammel | Canada | 1:02.67 | |
| 6 | Kelly Stefanyshyn | Canada | 1:02.91 | |
| 7 | Elli Overton | Australia | 1:03.47 | |
| 8 | Lia Oberstar | United States | 1:03.75 | |