| Final 20:18 | time | gap | L | React. | 50m | | 1. Giles Smith |  USA | 52.04s | PR | 4 | 0.59 | 27.55s | 7. | | 2. Santiago Grassi |  ARG | 52.09s | 0.05 | 5 | 0.67 | 27.74s | 3. | | 3. Santo Condorelli |  CAN | 52.42s | 0.38 | 2 | 0.71 | 28.28s | 1. | | 4. Albert Subirats |  VEN | 52.52s | 0.48 | 6 | 0.69 | 28.34s | 2. | | 5. Long Yuan Gutierrez |  MEX | 52.58s | 0.54 | 3 | 0.66 | 28.18s | 5. | | 6. Eugene Godsoe | USA | 52.66s | 0.62 | 1 | 0.69 | 28.28s | 4. | | 7. Arthur Mendes |  BRA | 52.73s | 0.69 | 7 | 0.63 | 28.29s | 6. | | 8. Luis Martinez |  GUA | 52.75s | 0.71 | 8 | 0.66 | 28.01s | 8. |
| World Record: Michael Phelps (USA) 49.82s, Roma (ITA), 01.08.2009. | | Pan American Games Record: Kaio de Almeida (BRA) 52.05s, Rio de Janeiro (BRA), 18.07.2007. | | Qualification times. Standard A: 53.99s, Standard B: 57:23. |
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| Final B 20:13 | time | gap | L | React. | 50m | | 9. Benjamin Hockin |  PAR | 53.45s | | 5 | 0.81 | 28.73s | 2. | | 10.Coleman Allen | CAN | 53.46s | 0.01 | 4 | 0.68 | 28.53s | 3. | | 11.Marcos Barale | ARG | 53.47s | 0.02 | 3 | 0.77 | 28.90s | 1. | | 12.Esnaider Reales |  COL | 54.03s | 0.58 | 6 | 0.72 | 28.59s | 4. | | 13.Andrew Torres |  PUR | 54.77s | 1.32 | 2 | 0.67 | 29.04s | 5. | | 14.Allan Gutierrez |  HON | 55.21s | 1.76 | 7 | 0.66 | 29.38s | 6. | | 15.Aldo Castillo Sulca |  BOL | 56.97s | 3.52 | 1 | 0.72 | 30.54s | 7. |
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Heats - Thursday 16.07 10:56 | | First 8 to Final. Next 8 to Final B. |
| Ranking | time | gap | L | React. | 50m | Heat | | 1. Giles Smith | USA | 52.13s | Q | 4 | 0.61 | 27.51s | 4. | Heat 3 | | 2. Mauricio Fiol |  PER | 52.25s | 0.12 | 3 | 0.68 | 27.91s | 2. | Heat 3 | | 3. Santiago Grassi | ARG | 52.34s | 0.21 | 5 | 0.64 | 28.04s | 1. | Heat 2 | | 4. Long Yuan Gutierrez | MEX | 52.57s | 0.44 | 2 | 0.66 | 28.00s | 4. | Heat 2 | | 5. Albert Subirats | VEN | 52.60s | 0.47 | 5 | 0.65 | 27.97s | 2. | Heat 1 | | 6. Santo Condorelli | CAN | 52.67s | 0.54 | 5 | 0.67 | 28.36s | 1. | Heat 3 | | 7. Arthur Mendes | BRA | 52.85s | 0.72 | 4 | 0.83 | 28.63s | 1. | Heat 1 | | 8. Eugene Godsoe | USA | 52.89s | 0.76 | 3 | 0.75 | 28.39s | 3. | Heat 2 | | 9. Luis Martinez | GUA | 52.90s | 0.77 | 6 | 0.67 | 28.33s | 3. | Heat 3 | | to Final B | | 10.Coleman Allen | CAN | 53.23s | 1.10 | 3 | 0.71 | 28.42s | 3. | Heat 1 | | 11.Benjamin Hockin | PAR | 53.63s | 1.50 | 6 | 0.83 | 28.69s | 4. | Heat 1 | | 12.Marcos Barale | ARG | 53.73s | 1.60 | 6 | 0.72 | 29.27s | 2. | Heat 2 | | 13.Dylan Carter |  TTO | 53.89s | 1.76 | 7 | 0.66 | 29.04s | 5. | Heat 3 | | 14.Esnaider Reales | COL | 54.42s | 2.29 | 2 | 0.79 | 29.04s | 6. | Heat 3 | | 15.Andrew Torres | PUR | 54.69s | 2.56 | 2 | 0.70 | 29.13s | 5. | Heat 1 | | 16.Allan Gutierrez | HON | 55.52s | 3.39 | 7 | 0.80 | 29.65s | 5. | Heat 2 | | eliminated | | 17.Aldo Castillo Sulca | BOL | 57.25s | 5.12 | 7 | 0.67 | 30.44s | 6. | Heat 1 | | -. Thiago Pereira | BRA | DNS | | 4 | | | | Heat 2 |
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| Swimmer | Q. time | Birth | | Giles Smith | USA | 52.02s | 28 NOV 1991 | | Thiago Pereira | BRA | 52.27s | 26 JAN 1986 | | Arthur Mendes | BRA | 52.33s | 07 SEP 1993 | | Santo Condorelli | CAN | 52.50s | 17 JAN 1995 | | Santiago Grassi | ARG | 52.94s | 25 SEP 1996 | | Albert Subirats | VEN | 53.01s | 25 SEP 1986 | | Mauricio Fiol | PER | 53.03s | 26 MAR 1994 | | Eugene Godsoe | USA | 53.06s | 20 JAN 1988 | | Coleman Allen | CAN | 53.12s | 09 FEB 1993 | | Luis Martinez | GUA | 53.34s | 11 DEC 1995 | | Marcos Barale | ARG | 53.82s | 21 JAN 1987 | | Benjamin Hockin | PAR | 53.87s | 27 SEP 1986 | | Long Yuan Gutierrez | MEX | 53.92s | 23 FEB 1995 | | Esnaider Reales | COL | 53.92s | 28 APR 1996 | | Standard A: 53.99s | | Andrew Torres | PUR | 54.17s | 24 NOV 1991 | | Dylan Carter | TTO | 54.21s | 30 JAN 1996 | | Allan Gutierrez | HON | 55.44s | 12 AUG 1993 | | Aldo Castillo Sulca | BOL | 57.22s | 16 AUG 1995 | | Standard B: 57.23s |
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