Swimming at the 2011 Pan American Games – Men's 100 metre freestyle
The men's 100 metre freestyle competition of the swimming events at the 2011 Pan American Games took place on October 16 at the Scotiabank Aquatics Center in the municipality of Zapopan, near Guadalajara, Mexico. The defending Pan American Games champion was César Cielo Filho of the Brazil.
This race consisted of two lengths of the pool, both lengths in freestyle.
Records
Prior to this competition, the existing world and Pan American Games records were as follows:| World record | 46.91 | Rome, Italy | July 30, 2009 | |
| Pan American Games record | 48.79 | Rio de Janeiro, Brazil | July 18, 2007 |
Qualification
Each National Olympic Committee was able to enter up to two entrants providing they had met the A standard in the qualifying period. NOCs were also permitted to enter one athlete providing they had met the B standard 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 16.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 4 | Cesar Cielo | 48.89 | QA | |
| 2 | 3 | 3 | Shaune Fraser | 49.00 | QA | |
| 3 | 3 | 5 | Hanser Garcia | 49.08 | QA | |
| 4 | 2 | 5 | Douglas Robison | 49.09 | QA | |
| 5 | 1 | 4 | Brett Fraser | 49.16 | QA | |
| 6 | 1 | 5 | Robert Savulich | 49.58 | QA | |
| 7 | 1 | 6 | Cristian Quintero | 49.87 | QA | |
| 8 | 2 | 3 | Benjamin Hockin | 49.91 | QA | |
| 9 | 1 | 3 | Federico Grabich | 50.20 | QB | |
| 10 | 3 | 6 | Crox Acuña | 50.35 | QB | |
| 11 | 2 | 4 | Bruno Fratus | 50.51 | QB | |
| 12 | 2 | 6 | Gabriel Melconian | 51.02 | QB | |
| 13 | 3 | 2 | Rory Biskupski | 51.12 | QB | |
| 14 | 3 | 7 | Shawn Clarke | 51.18 | QB | |
| 15 | 2 | 1 | Alejandro Escudero | 51.38 | QB | |
| 16 | 1 | 7 | Mario Montoya | 51.86 | QB | |
| 17 | 2 | 7 | Raúl Martínez | 52.06 | ||
| 18 | 3 | 1 | Antonio Cisneros | 52.42 | ||
| 19 | 2 | 2 | Branden Whitehurst | 52.45 | ||
| 20 | 1 | 2 | Roy-Allan Burch | 52.87 | ||
| 21 | 3 | 8 | Perry Lindo | Netherlands Antilles | 53.32 | |
| 22 | 1 | 1 | Esau Simpson | 54.73 | ||
| 23 | 1 | 8 | Niall Roberts | 55.45 | ||
| 24 | 2 | 8 | Orel Jeffrey | 1:03.84 |
B Final
The B final was also held on October 16.| Rank | Lane | Name | Nationality | Time | Notes |
| 9 | 4 | Federico Grabich | 49.95 | ||
| 10 | 5 | Gabriel Melconian | 50.30 | ||
| 11 | 6 | Shawn Clarke | 51.00 | ||
| 12 | 3 | Rory Biskupski | 51.15 | ||
| 13 | 2 | Alejandro Escudero | 51.66 | ||
| 14 | 7 | Mario Montoya | 51.83 | ||
| 15 | 1 | Raúl Martínez | 51.94 | ||
| 16 | 8 | Antonio Cisneros | 52.55 |
A Final
The A final was also held on October 16.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Cesar Cielo | 47.84 | GR | ||
| 3 | Hanser Garcia | 48.34 | |||
| 5 | Shaune Fraser | 48.63 | |||
| 4 | 6 | Douglas Robison | 48.98 | ||
| 5 | 2 | Brett Fraser | 49.07 | ||
| 6 | 7 | Robert Savulich | 49.62 | ||
| 7 | 1 | Cristian Quintero | 49.75 | ||
| 8 | 8 | Benjamin Hockin | 50.03 |