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

The men's 100 metre butterfly competition of the swimming events at the 2015 Pan American Games took place on July 16 at the CIBC Pan Am/Parapan Am Aquatics Centre and Field House in Toronto, Canada. The defending Pan American Games champion was Albert Subirats of Venezuela.
This race consisted of two lengths of the pool, all lengths in butterfly. 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 | Michael Phelps (USA) | 49.82 | Rome, Italy | August 1, 2009 |
| Pan American Games record | Kaio de Almeida (BRA) | 52.05 | Rio de Janeiro, Brazil | July 18, 2007 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 16 July | A Final | Giles Smith | United States | 52.04 | GR |

## Qualification

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (53.99) 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 (57.23) 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 16, 2015 | 10:56 | Heats |
| July 16, 2015 | 20:13 | Final B |
| July 16, 2015 | 20:18 | 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 16.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 4 | Giles Smith | United States | 52.13 | QA |
| 2 | 3 | 3 | Mauricio Fiol | Peru | 52.25 | QA |
| 3 | 2 | 5 | Santiago Grassi | Argentina | 52.34 | QA |
| 4 | 2 | 2 | Long Yuan Gutierrez | Mexico | 52.57 | QA |
| 5 | 1 | 5 | Albert Subirats | Venezuela | 52.60 | QA |
| 6 | 3 | 5 | Santo Condorelli | Canada | 52.67 | QA |
| 7 | 1 | 4 | Arthur Mendes | Brazil | 52.85 | QA |
| 8 | 2 | 3 | Eugene Godsoe | United States | 52.89 | QA |
| 9 | 3 | 6 | Luiz Martínez | Guatemala | 52.90 | QB |
| 10 | 1 | 3 | Coleman Allen | Canada | 53.23 | QB |
| 11 | 1 | 6 | Ben Hockin | Paraguay | 53.63 | QB |
| 12 | 2 | 6 | Marcos Barale | Argentina | 53.73 | QB |
| 13 | 3 | 7 | Dylan Carter | Trinidad and Tobago | 53.89 | QB |
| 14 | 3 | 2 | Esnaider Reales | Colombia | 54.42 | QB |
| 15 | 1 | 2 | Andrew Torres | Puerto Rico | 54.69 | QB |
| 16 | 2 | 7 | Allan Gutiérrez Castro | Honduras | 55.52 | QB |
| 17 | 1 | 7 | Aldo Castillo Sulca | Bolivia | 57.25 | |
| | 2 | 4 | Thiago Pereira | Brazil | | DNS |

### B Final

The B final was also held on July 16.
| Rank | Lane | Name | Nationality | Time |
| 9 | 5 | Ben Hockin | Paraguay | 53.45 |
| 10 | 4 | Coleman Allen | Canada | 53.46 |
| 11 | 3 | Marcos Barale | Argentina | 53.47 |
| 12 | 6 | Esnaider Reales | Colombia | 54.03 |
| 13 | 2 | Andrew Torres | Puerto Rico | 54.77 |
| 14 | 7 | Allan Gutiérrez Castro | Honduras | 55.21 |
| 15 | 1 | Aldo Castillo Sulca | Bolivia | 56.97 |

### A Final

The A final was also held on July 16.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Giles Smith | United States | 52.04 | GR |
| | 5 | Santiago Grassi | Argentina | 52.09 | NR |
| | 2 | Santo Condorelli | Canada | 52.42 | |
| 4 | 6 | Albert Subirats | Venezuela | 52.52 | |
| 5 | 3 | Long Yuan Gutierrez | Mexico | 52.58 | |
| 6 | 1 | Eugene Godsoe | United States | 52.66 | |
| 7 | 7 | Arthur Mendes | Brazil | 52.73 | |
| 8 | 8 | Luiz Martínez | Guatemala | 52.75 | |
* Peruvian swimmer Mauricio Fiol was suspended by his team and pulled from the final for testing positive for stanozolol.