Swimming at the 2011 Pan American Games – Men's 100 metre butterfly
# Swimming at the 2011 Pan American Games – Men's 100 metre butterfly

The men's 100 metre butterfly competition of the swimming events at the 2011 Pan American Games took place on 20 October at the Scotiabank Aquatics Center. The defending Pan American Games champion was Kaio de Almeida of Brazil.

This race consisted of two lengths of the pool, all in butterfly.

## 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 |

## Qualification

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (54.6) in the qualifying period (January 1, 2010 to September 4, 2011). NOCs were also permitted to enter one athlete providing they had met the B standard (56.2) in the same qualifying period.

## Results

All times are in minutes and seconds.

| 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 October 20.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 2 | 5 | Gabriel Mangabeira | Brazil | 52.95 | QA |
| 2 | 3 | 5 | Christopher Brady | United States | 53.67 | QA |
| 3 | 3 | 3 | Omar Pinzón | Colombia | 53.76 | QA |
| 4 | 1 | 3 | Shaune Fraser | Cayman Islands | 53.83 | QA |
| 5 | 3 | 4 | Albert Subirats | Venezuela | 53.84 | QA |
| 6 | 2 | 3 | Benjamin Hockin | Paraguay | 53.87 | QA |
| 7 | 2 | 4 | Kaio de Almeida | Brazil | 53.88 | QA |
| 8 | 1 | 4 | Eugene Godsoe | United States | 54.21 | QA |
| 9 | 1 | 5 | Octavio Alesi | Venezuela | 54.51 | QB |
| 10 | 3 | 2 | Mauricio Fiol | Peru | 54.56 | QB |
| 11 | 1 | 2 | Israel Duran | Mexico | 55.18 | QB |
| 12 | 2 | 2 | Pablo Marmolejo | Mexico | 55.27 | QB |
| 13 | 3 | 7 | Alex Hernandez | Cuba | 55.28 | QB |
| 14 | 3 | 6 | Marcos Barale | Argentina | 55.31 | QB |
| 15 | 1 | 6 | Jose Lobo | Paraguay | 57.18 | QB |
| | 2 | 6 | Brett Fraser | Cayman Islands | | DNS |
| | 2 | 7 | Niall Roberts | Guyana | | DNS |

### B Final

The B final was also held on October 20.

| Rank | Lane | Name | Nationality | Time |
| - | - | - | - | - |
| 9 | 4 | Octavio Alesi | Venezuela | 54.15 |
| 10 | 5 | Mauricio Fiol | Peru | 54.26 |
| 11 | 7 | Marcos Barale | Argentina | 54.77 |
| 12 | 3 | Israel Duran | Mexico | 54.94 |
| 13 | 6 | Pablo Marmolejo | Mexico | 55.00 |
| 14 | 2 | Alex Hernandez | Cuba | 55.63 |
| 15 | 1 | Jose Lobo | Paraguay | 56.10 |

### A Final

The A final was held on October 20.

| Rank | Lane | Name | Nationality | Time |
| - | - | - | - | - |
| | 2 | Albert Subirats | Venezuela | 52.37 |
| | 8 | Eugene Godsoe | United States | 52.67 |
| | 5 | Christopher Brady | United States | 52.95 |
| 4 | 6 | Shaune Fraser | Cayman Islands | 52.96 |
| 5 | 3 | Omar Pinzón | Colombia | 53.17 |
| 6 | 4 | Gabriel Mangabeira | Brazil | 53.24 |
| 7 | 7 | Benjamin Hockin | Paraguay | 53.43 |
| 8 | 1 | Kaio de Almeida | Brazil | 53.62 |
