The men's 100 metre backstroke competition of the swimming events at the 2011 Pan American Games took place on October 17 at the Scotiabank Aquatics Center in the municipality of Zapopan, near Guadalajara, Mexico.[1] The defending Pan American Games champion was Randall Bal of the United States
| Men's 100 metre backstroke at the 2011 Pan American Games | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
 | ||||||||||
| Venue | Scotiabank Aquatics Center | |||||||||
| Dates | October 17 (preliminaries and finals) | |||||||||
| Competitors | 11 from 8 nations | |||||||||
| Medalists | ||||||||||
| ||||||||||
«2007 2015» | ||||||||||
This race consisted of two lengths of the pool, all in backstroke.[2]
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 |
Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (56.7) 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 (58.6) in the same qualifying period.[2]
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 |
The first round was held on October 17.
| Rank | Heat | Lane | Name | Nationality | Time[3] | Notes |
|---|---|---|---|---|---|---|
| 1 | 2 | 4 | Eugene Godsoe | United States |
55.04 | QA |
| 2 | 2 | 5 | Thiago Pereira |  Brazil |
55.50 | QA |
| 3 | 1 | 4 | David Russell | United States |
55.57 | QA |
| 4 | 1 | 5 | Guilherme Guido | Brazil |
55.71 | QA |
| 5 | 1 | 3 | Federico Grabich |  Argentina |
56.00 | QA |
| 6 | 2 | 6 | Pedro Medel |  Cuba |
56.71 | QA |
| 7 | 2 | 3 | Omar Pinzón |  Colombia |
56.82 | QA |
| 8 | 1 | 6 | Luis Rojas |  Venezuela |
57.61 | QA |
| 9 | 1 | 2 | Charles Hockin |  Paraguay |
57.65 | QB |
| 10 | 2 | 7 | Miguel Robles |  Mexico |
57.93 | QB |
| 11 | 2 | 2 | Anival Rodriguez | Mexico |
59.29 | QB |
The B final was also held on October 17.[4]
| Rank | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 9 | 4 | Miguel Robles | Mexico |
58.29 | |
| 10 | 5 | Anival Rodriguez | Mexico |
59.11 |
The A final was also held on October 17.[4]
| Rank | Lane | Name | Nationality | Time[5] | Notes |
|---|---|---|---|---|---|
 |
5 | Thiago Pereira | Brazil |
54.56 | |
 |
4 | Eugene Godsoe | United States |
54.61 | |
 |
6 | Guilherme Guido | Brazil |
54.81 | |
| 4 | 3 | David Russell | United States |
54.87 | |
| 5 | 2 | Federico Grabich | Argentina |
55.22 | |
| 6 | 7 | Pedro Medel | Cuba |
56.16 | |
| 7 | 1 | Luis Rojas | Venezuela |
57.54 | |
| 8 | 8 | Charles Hockin | Paraguay |
57.63 |
