| Final 21:08 | time | gap | L | React. | | 1. Arianna Vanderpool-Wallace | BAH | 24.38s | | 4 | 0.65 | | 2. Etiene Medeiros | BRA | 24.55s | 0.17 | 5 | 0.66 | | 3. Natalie Coughlin | USA | 24.66s | 0.28 | 7 | 0.77 | | 4. Chantal Van Landeghem | CAN | 24.70s | 0.32 | 2 | 0.86 | | 5. Madison Kennedy | USA | 24.80s | 0.42 | 3 | 0.81 | | 6. Michelle Williams | CAN | 24.91s | 0.53 | 1 | 0.69 | | 7. Graciele Herrmann | BRA | 24.94s | 0.56 | 6 | 0.66 | | 8. Vanessa Garcia | PUR | 25.21s | 0.83 | 8 | 0.68 |
| World Record: Britta Steffen (GER) 23.73s, Roma (ITA), 02.08.2009. | | Pan American Games Record: Lara Marte Jackson (USA) 25.09s, Guadalajara (MEX), 21.10.2011. | | Qualification times. Standard A: 26.05s, Standard B: 27.61s. |
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| Final B 21:04 | time | gap | L | React. | | 9. Liliana IbaƱez | MEX | 25.48s | | 4 | 0.73 | | 10.Chinyere Pigot | SUR | 25.79s | 0.31 | 5 | 0.73 | | 11.Arlene Semeco | VEN | 25.79s | 0.31 | 3 | 0.72 | | 12.Isabella Arcila | COL | 25.82s | 0.34 | 6 | 0.66 | | 13.Aixa Triay | ARG | 26.00s | 0.52 | 7 | 0.80 | | 14.Karen Torrez | BOL | 26.12s | 0.64 | 2 | 0.65 | | 15.Ariel Weech | BAH | 26.28s | 0.80 | 8 | 0.71 | | 16.Allyson Ponson | ARU | 26.37s | 0.89 | 1 | 0.70 |
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Heats - Friday 17.07 11:32 | | First 8 to Final. Next 8 to Final B. |
| Ranking | time | gap | L | React. | Heat | | 1. Arianna Vanderpool-Wallace | BAH | 24.31s | PR | 4 | 0.65 | Heat 4 | | 2. Etiene Medeiros | BRA | 24.75s | 0.44 | 4 | 0.65 | Heat 2 | | 2. Madison Kennedy | USA | 24.75s | 0.44 | 5 | 0.70 | Heat 4 | | 4. Graciele Herrmann | BRA | 24.97s | 0.66 | 5 | 0.76 | Heat 3 | | 5. Chantal Van Landeghem | CAN | 24.99s | 0.68 | 4 | 0.73 | Heat 3 | | 6. Natalie Coughlin | USA | 25.07s | 0.76 | 5 | 0.70 | Heat 2 | | 6. Michelle Williams | CAN | 25.07s | 0.76 | 3 | 0.74 | Heat 4 | | 8. Vanessa Garcia | PUR | 25.37s | 1.06 | 3 | 0.69 | Heat 3 | | to Final B | | 9. Liliana Ibanez | MEX | 25.46s | 1.15 | 6 | 0.73 | Heat 4 | | 10.Chinyere Pigot | SUR | 25.76s | 1.45 | 2 | 0.71 | Heat 2 | | 11.Arlene Semeco | VEN | 25.83s | 1.52 | 6 | 0.74 | Heat 3 | | 12.Isabella Arcila | COL | 25.89s | 1.58 | 2 | 0.64 | Heat 4 | | 13.Karen Torrez | BOL | 26.01s | 1.70 | 2 | 0.64 | Heat 3 | | 14.Aixa Triay | ARG | 26.03s | 1.72 | 7 | 0.84 | Heat 4 | | 15.Allyson Ponson | ARU | 26.22s | 1.91 | 6 | 0.68 | Heat 2 | | 16.Ariel Weech | BAH | 26.32s | 2.01 | 3 | 0.74 | Heat 2 | | 17.Elisbet Gamez | CUB | 26.39s | 2.08 | 7 | 0.70 | Heat 2 | | 18.Loren Bahamonde | ECU | 26.70s | 2.39 | 7 | 0.71 | Heat 3 | | 19.Marie Laura Meza | CRC | 26.74s | 2.43 | 8 | 0.73 | Heat 4 | | 20.Karen Riveros | PAR | 27.17s | 2.86 | 1 | 0.66 | Heat 4 | | 21.Elinah Phillip | IVB | 27.37s | 3.06 | 1 | 0.71 | Heat 3 | | 22.Dalia Torrez | NCA | 27.80s | 3.49 | 8 | 0.78 | Heat 3 | | 23.Jamaris Washshah | ISV | 27.87s | 3.56 | 4 | 0.77 | Heat 1 | | 24.Samantha Roberts | ANT | 27.91s | 3.60 | 3 | 0.80 | Heat 1 | | 25.Trudian Patrick | JAM | 27.99s | 3.68 | 5 | 0.75 | Heat 1 | | 26.Oreoluwa Cherebin | GRN | 28.28s | 3.97 | 8 | 0.81 | Heat 2 | | 27.Onika George | GUY | 29.03s | 4.72 | 6 | 0.77 | Heat 1 | | -. Izzy Joachim | VIN | DNS | | 1 | | Heat 2 |
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| Swimmer | Q. time | Birth | | Arianna Vanderpool-Wallace | BAH | 24.65s | 04 MAR 1990 | | Chantal Van Landeghem | CAN | 24.69s | 05 MAR 1994 | | Etiene Medeiros | BRA | 24.74s | 24 MAY 1991 | | Madison Kennedy | USA | 24.78s | 22 DEC 1987 | | Graciele Herrmann | BRA | 24.78s | 01 JAN 1992 | | Natalie Coughlin | USA | 24.97s | 23 AUG 1982 | | Michelle Williams | CAN | 25.00s | 02 JAN 1991 | | Vanessa Garcia | PUR | 25.54s | 18 JUL 1984 | | Ariel Weech | BAH | 25.72s | 28 OCT 1991 | | Liliana Ibanez | MEX | 25.73s | 30 JAN 1991 | | Arlene Semeco | VEN | 25.73s | 11 JAN 1984 | | Allyson Ponson | ARU | 25.91s | 04 DEC 1995 | | Isabella Arcila | COL | 25.98s | 11 MAR 1994 | | Karen Torrez | BOL | 26.03s | 29 JUL 1992 | | Chinyere Pigot | SUR | 26.05s | 01 MAY 1993 | | Standard A: 26.05s | | Aixa Triay | ARG | 26.31s | 01 MAY 1990 | | Loren Bahamonde | ECU | 26.79s | 04 JUN 1987 | | Elisbet Gamez | CUB | 26.85s | 17 JAN 1997 | | Karen Riveros | PAR | 27.22s | 04 DEC 1994 | | Elinah Phillip | IVB | 27.23s | 03 APR 2000 | | Izzy Joachim | VIN | 27.30s | 11 MAY 2000 | | Marie Laura Meza | CRC | 27.48s | 20 NOV 1990 | | Standard B: 27.61s | | Dalia Torrez | NCA | 27.67s | 29 MAR 1990 | | Oreoluwa Cherebin | GRN | 28.01s | 24 DEC 1997 | | Jamaris Washshah | ISV | 28.13s | 27 JUN 1997 | | Trudian Patrick | JAM | 28.35s | 21 SEP 1995 | | Samantha Roberts | ANT | 28.37s | 21 APR 2000 | | Onika George | GUY | 29.02s | 02 JAN 1998 |
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