1999 Pan Pacific Swimming Championships – Men's 100 metre backstroke
The men'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 Lenny Krayzelburg of US.
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 | 53.86 | Barcelona, Spain | July 31, 1992 | |
| Pan Pacific Championships record | 54.43 | Fukuoka, Japan | August 10, 1997 |
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 | Lenny Krayzelburg | 54.80 | Q | |
| 2 | Atsushi Nishikori | 55.92 | Q | |
| 3 | Keitaro Konnai | 56.07 | Q | |
| 3 | Josh Watson | 56.07 | Q | |
| 5 | Robert Brewer | 56.09 | Q | |
| 6 | Matt Welsh | 56.17 | Q | |
| 7 | Mark Versfeld | 56.25 | Q | |
| 8 | Brad Bridgewater | 56.40 | Q | |
| 9 | Ray Hass | 56.42 | Q | |
| 10 | Dustin Hersee | 56.50 | Q | |
| 11 | Neil Walker | 56.51 | Q | |
| 12 | Chris Renaud | 56.82 | Q | |
| 13 | Simon Thirsk | 56.96 | Q | |
| 14 | Alex Lim | 57.02 | Q | |
| 15 | Cameron Delaney | 57.31 | Q | |
| 16 | Greg Hamm | 57.43 | Q | |
| 17 | Naoya Sonoda | 57.69 | ||
| 18 | Robert van der Zant | 57.90 | ||
| 19 | Scott Miller | 58.02 | ||
| 20 | Geoff Huegill | 58.22 | ||
| 21 | Greg Main-Baillie | 58.48 | ||
| 22 | Scott Talbot-Cameron | 58.79 | ||
| 23 | Torin Hay | 58.82 |
Semifinals
The semifinals were held on August 23.| Rank | Name | Nationality | Time | Notes |
| 1 | Lenny Krayzelburg | 54.07 | Q, CR | |
| 2 | Matt Welsh | 55.42 | Q | |
| 3 | Robert Brewer | 55.56 | Q | |
| 4 | Atsushi Nishikori | 55.58 | Q | |
| 5 | Keitaro Konnai | 55.70 | Q | |
| 6 | Mark Versfeld | 55.83 | Q | |
| 7 | Josh Watson | 55.84 | Q | |
| 8 | Brad Bridgewater | 56.07 | Q | |
| 9 | Ray Hass | 56.15 | ||
| 10 | Neil Walker | 56.16 | ||
| 11 | Chris Renaud | 56.40 | ||
| 12 | Cameron Delaney | 56.48 | ||
| 13 | Dustin Hersee | 56.52 | ||
| 14 | Simon Thirsk | 56.64 | ||
| 15 | Alex Lim | 57.17 | ||
| 16 | Greg Hamm | 57.57 |
Final
The final was held on August 24.| Rank | Lane | Nationality | Time | Notes |
| Lenny Krayzelburg | 53.60 | WR | ||
| Matt Welsh | 55.13 | |||
| Josh Watson | 55.18 | |||
| 4 | Robert Brewer | 55.39 | ||
| 5 | Atsushi Nishikori | 55.61 | ||
| 6 | Keitaro Konnai | 55.62 | ||
| 7 | Mark Versfeld | 55.82 | ||
| 8 | Chris Renaud | 55.87 |