| 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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