# Swimming at the 2015 Pan American Games – Men's 100 metre backstroke

The men's 100 metre backstroke competition of the swimming events at the 2015 Pan American Games took place on July 17 at the CIBC Pan Am/Parapan Am Aquatics Centre and Field House in Toronto, Canada. The defending Pan American Games champion was Thiago Pereira of Brazil.
This race consisted of two lengths of the pool, both lengths in backstroke. The top eight swimmers from the heats would qualify for the A final (where the medals would be awarded), while the next best eight swimmers would qualify for the B final.

## Records

Prior to this competition, the existing world and Pan American Games records were as follows:
| World record | Aaron Peirsol (USA) | 51.94 | Indianapolis, United States | July 8, 2009 |
| Pan American Games record | Randall Bal (USA) | 53.66 | Rio de Janeiro, Brazil | July 22, 2007 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 17 July | A Final | Nick Thoman | United States | 53.20 | GR |

## Qualification

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (56.59) in the qualifying period (January 1, 2014 to May 1, 2015). NOCs were also permitted to enter one athlete providing they had met the B standard (59.99) in the same qualifying period. All other competing athletes were entered as universality spots.

## Schedule

All times are Eastern Time Zone (UTC-4).
| Date | Time | Round |
| July 17, 2015 | 10:18 | Heats |
| July 17, 2015 | 19:18 | Final B |
| July 17, 2015 | 19:24 | Final A |

## Results

| KEY: | q | Fastest non-qualifiers | Q | Qualified | GR | Games record | NR | National record | PB | Personal best | SB | Seasonal best |

### Heats

The first round was held on July 17.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Guilherme Guido | Brazil | 54.04 | QA |
| 2 | 3 | 4 | Nick Thoman | United States | 54.35 | QA |
| 3 | 2 | 5 | Eugene Godsoe | United States | 54.38 | QA |
| 4 | 1 | 4 | Russell Wood | Canada | 54.55 | QA |
| 5 | 1 | 5 | Federico Grabich | Argentina | 54.87 | QA |
| 6 | 2 | 3 | Omar Pinzón | Colombia | 54.94 | QA |
| 7 | 1 | 3 | Albert Subirats | Venezuela | 55.24 | QA |
| 8 | 3 | 3 | Markus Thormeyer | Canada | 55.26 | QA |
| 9 | 3 | 6 | Armando Barrera | Cuba | 56.14 | QB |
| 10 | 3 | 2 | Charles Hockin | Paraguay | 56.56 | QB |
| 11 | 1 | 6 | Robinson Molina | Venezuela | 57.08 | QB |
| 12 | 1 | 2 | Luis Martínez | Guatemala | 57.22 | QB |
| 13 | 2 | 6 | Daniel Torres | Mexico | 57.38 | QB |
| 14 | 3 | 7 | Timothy Winter | Jamaica | 57.86 | QB |
| 15 | 2 | 2 | Christopher Courtis | Barbados | 58.15 | QB |
| 16 | 1 | 7 | Matthew Mays | Virgin Islands | 59.15 | QB |
| | 2 | 7 | Jordan Augier | Saint Lucia | | DNS |
| | 3 | 5 | Thiago Pereira | Brazil | | DNS |

### B Final

The B final was also held on July 17.
| Rank | Lane | Name | Nationality | Time |
| 9 | 4 | Armando Barrera | Cuba | 56.14 |
| 10 | 2 | Daniel Torres | Mexico | 56.91 |
| 11 | 5 | Charles Hockin | Paraguay | 57.25 |
| 12 | 6 | Luis Martínez | Guatemala | 57.30 |
| 13 | 7 | Timothy Winter | Jamaica | 57.47 |
| 14 | 3 | Robinson Molina | Venezuela | 57.92 |
| 15 | 1 | Christopher Courtis | Barbados | 57.93 |
| 16 | 8 | Matthew Mays | Virgin Islands | 59.14 |

### A Final

The A final was also held on July 17.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Nick Thoman | United States | 53.20 | GR |
| | 4 | Guilherme Guido | Brazil | 53.35 | |
| | 3 | Eugene Godsoe | United States | 53.96 | |
| 4 | 6 | Russell Wood | Canada | 54.30 | |
| 5 | 2 | Federico Grabich | Argentina | 54.61 | |
| 6 | 7 | Omar Pinzón | Colombia | 55.22 | |
| 7 | 8 | Markus Thormeyer | Canada | 55.52 | |
| 8 | 1 | Albert Subirats | Venezuela | 56.09 | |