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

The men'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 Aaron Peirsol 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 | Aaron Peirsol (USA) | 51.94 | Indianapolis, United States | July 8, 2009 |
| Pan Pacific Championships record | Aaron Peirsol (USA) | 53.32 | Victoria, Canada | August 17, 2006 |

## 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 10:59.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 5 | David Plummer | United States | 53.33 | QA |
| 2 | 4 | 7 | Ryan Lochte | United States | 53.69 | QA |
| 3 | 4 | 4 | Ashley Delaney | Australia | 53.78 | QA |
| 4 | 4 | 3 | Aaron Peirsol | United States | 53.85 | QA |
| 5 | 3 | 3 | Nick Thoman | United States | 53.96 | QA |
| 6 | 3 | 5 | Hayden Stoeckel | Australia | 54.05 | QA |
| 7 | 2 | 5 | Ryosuke Irie | Japan | 54.18 | QA |
| 8 | 2 | 4 | Junya Koga | Japan | 54.39 | QA |
| 9 | 3 | 4 | Guilherme Guido | Brazil | 54.79 | QB |
| 9 | 3 | 2 | Masafumi Yamaguchi | Japan | 54.79 | QB |
| 11 | 2 | 4 | Daniel Arnamnart | Australia | 54.81 | QB |
| 12 | 2 | 1 | Gareth Kean | New Zealand | 55.00 | QB |
| 13 | 2 | 7 | Ben Treffers | Australia | 55.02 | QB |
| 14 | 2 | 3 | George Du Rand | South Africa | 55.08 | QB |
| 15 | 4 | 2 | Gabriel Mangabeira | Brazil | 55.15 | QB |
| 16 | 4 | 1 | Jake Tapp | Canada | 55.31 | QB |
| 17 | 3 | 6 | Daniel Bell | New Zealand | 55.32 | |
| 18 | 3 | 1 | Tobias Oriwol | Canada | 55.37 | |
| 19 | 4 | 8 | Kuninori Tada | Japan | 55.60 | |
| 20 | 3 | 8 | Matt Hawes | Canada | 55.65 | |
| 21 | 3 | 7 | Charles Francis | Canada | 55.73 | |
| 22 | 2 | 2 | Park Seon-Kwan | South Korea | 56.01 | |
| 23 | 2 | 8 | Matthew Swanston | Canada | 56.34 | |
| 24 | 4 | 6 | Federico Grabich | Argentina | 56.38 | |
| 25 | 1 | 5 | Andrew Ford | Canada | 57.05 | |
| 26 | 1 | 4 | Nicholas Sinclair | Canada | 57.58 | |
| 27 | 1 | 3 | Chung Lai-Yeung | Hong Kong | 59.95 | |

### B Final

The B final was held on August 18, at 19:18.
| Rank | Lane | Name | Nationality | Time |
| 9 | 4 | Nick Thoman | United States | 53.66 |
| 10 | 5 | Masafumi Yamaguchi | Japan | 54.98 |
| 11 | 8 | Tobias Oriwol | Canada | 55.34 |
| 12 | 6 | George Du Rand | South Africa | 55.36 |
| 13 | 1 | Daniel Bell | New Zealand | 55.37 |
| 14 | 7 | Jake Tapp | Canada | 55.47 |
| 15 | 2 | Gabriel Mangabeira | Brazil | 56.01 |
| 16 | 3 | Daniel Arnamnart | Australia | 56.08 |

### A Final

The A final was held on August 18, at 19:18.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 3 | Aaron Peirsol | United States | 53.31 | CR |
| | 7 | Junya Koga | Japan | 53.63 | |
| | 5 | Ashley Delaney | Australia | 53.67 | |
| 4 | 2 | Ryosuke Irie | Japan | 53.71 | |
| 5 | 4 | David Plummer | United States | 53.80 | |
| 6 | 6 | Hayden Stoeckel | Australia | 54.06 | |
| 7 | 8 | Gareth Kean | New Zealand | 54.57 | |
| 8 | 1 | Guilherme Guido | Brazil | 55.05 | |