| Final 20:08 | time | gap | L | React. | 50m |  | 1. Kelsi Worrell |  USA | 57.78s |   | 4 | 0.69 | 30.89s | 3. |  | 2. Noemie Thomas |  CAN | 58.00s | 0.22 | 3 | 0.62 | 30.79s | 4. |  | 3. Katerine Savard |  CAN | 58.05s | 0.27 | 5 | 0.69 | 31.36s | 1. |  | 4. Daynara De Paula |  BRA | 58.56s | 0.78 | 6 | 0.66 | 31.69s | 2. |  | 5. Daiene Dias |  BRA | 58.74s | 0.96 | 2 | 0.71 | 31.32s | 5. |  | 6. Gia Dalesandro |  USA | 59.24s | 1.46 | 7 | 0.66 | 31.69s | 6. |  | 7. Marie Laura Meza |  CRC | 1:00.89 | 3.11 | 8 | 0.73 | 32.99s | 7. |  | 8. Jessica Camposano |  COL | 1:01.18 | 3.40 | 1 | 0.74 | 32.89s | 8. |   
| World Record: Dana Volmer (USA) 55.98s, London (GBR), 29.07.2012. |  | Pan American Games Record: . |  | Qualification times. Standard A: 1:01.49, Standard B: 1:05.18 |   
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| Final B 20:03 | time | gap | L | React. | 50m |  | 9. Isabella Paez |  VEN | 1:00.79 |   | 5 | 0.77 | 32.17s | 1. |  | 10.Ana Sofia Revilak |  MEX | 1:01.16 | 0.37 | 4 | 0.76 | 32.43s | 3. |  | 11.Diana Luna |  MEX | 1:01.49 | 0.70 | 2 | 0.73 | 32.52s | 6. |  | 12.Belen Diaz |  ARG | 1:01.50 | 0.71 | 3 | 0.74 | 32.68s | 5. |  | 13.Carolina Colorado |  COL | 1:01.81 | 1.02 | 7 | 0.73 | 33.02s | 4. |  | 14.Tereysa Lehnertz |  PUR | 1:02.02 | 1.23 | 1 | 0.72 | 32.35s | 7. |  | 15.Mckenna De Bever |  PER | 1:02.10 | 1.31 | 6 | 0.73 | 33.46s | 2. |  | -. Sharon Bravo |  ECU | DNS |   | 8 |   |   |   |   
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  Heats - Thursday 16.07 10:37 |  | First 8 to Final. Next 8 to Final B.  |   
| Ranking | time | gap | L | React. | 50m | Heat |  | 1. Kelsi Worrell |  USA | 57.24s | PR | 4 | 0.64 | 30.43s | 1. | Heat 1 |  | 2. Katerine Savard |  CAN | 58.34s | 1.10 | 4 | 0.66 | 31.30s | 2. | Heat 3 |  | 3. Noemie Thomas |  CAN | 58.61s | 1.37 | 4 | 0.68 | 31.05s | 1. | Heat 2 |  | 4. Daynara De Paula |  BRA | 58.70s | 1.46 | 5 | 0.65 | 31.51s | 3. | Heat 3 |  | 5. Daiene Dias |  BRA | 59.16s | 1.92 | 5 | 0.69 | 31.35s | 2. | Heat 2 |  | 6. Arianna Vanderpool-Wallace |  BAH | 59.33s | 2.09 | 3 | 0.63 | 32.70s | 1. | Heat 3 |  | 7. Gia Dalesandro |  USA | 59.83s | 2.59 | 5 | 0.67 | 31.98s | 2. | Heat 1 |  | 8. Jessica Camposano |  COL | 1:00.85 | 3.61 | 3 | 0.72 | 32.41s | 3. | Heat 1 |  | 9. Marie Laura Meza |  CRC | 1:01.01 | 3.77 | 6 | 0.73 | 33.02s | 3. | Heat 2 |  |  to Final B |  | 10.Ana Sofia Revilak |  MEX | 1:01.25 | 4.01 | 2 | 0.74 | 32.15s | 4. | Heat 3 |  | 11.Isabella Paez |  VEN | 1:01.27 | 4.03 | 2 | 0.77 | 32.51s | 5. | Heat 2 |  | 12.Belen Diaz |  ARG | 1:01.53 | 4.29 | 6 | 0.73 | 32.90s | 4. | Heat 1 |  | 13.Mckenna De Bever |  PER | 1:01.62 | 4.38 | 2 | 0.78 | 32.79s | 5. | Heat 1 |  | 14.Diana Luna |  MEX | 1:01.85 | 4.61 | 6 | 0.72 | 32.46s | 5. | Heat 3 |  | 15.Carolina Colorado |  COL | 1:02.36 | 5.12 | 3 | 0.81 | 33.86s | 4. | Heat 2 |  | 16.Tereysa Lehnertz |  PUR | 1:02.43 | 5.19 | 7 | 0.73 | 33.20s | 6. | Heat 2 |  | 17.Sharon Bravo |  ECU | 1:03.67 | 6.43 | 7 | 0.74 | 34.03s | 6. | Heat 3 |  |  eliminated |  | 18.Trudian Patrick |  JAM | 1:04.43 | 7.19 | 7 | 0.68 | 34.57s | 6. | Heat 1 |  | 19.Dalia Torrez |  NCA | 1:04.79 | 7.55 | 1 | 0.72 | 34.85s | 7. | Heat 2 |  | 20.Estefania Urzua |  CHI | 1:05.79 | 8.55 | 1 | 0.89 | 34.70s | 7. | Heat 3 |  | 21.Oreoluwa Cherebin |  GRN | 1:10.05 | 12.81 | 1 | 0.77 | 38.66s | 7. | Heat 1 |   
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| Swimmer | Q. time | Birth |  | Katerine Savard |  CAN | 57.27s | 26 MAY 1993 |  | Noemie Thomas |  CAN | 58.08s | 04 FEB 1996 |  | Kelsi Worrell |  USA | 58.24s | 15 JUL 1994 |  | Daynara De Paula |  BRA | 58.36s | 25 JUL 1989 |  | Daiene Dias |  BRA | 58.49s | 16 MAY 1989 |  | Gia Dalesandro |  USA | 58.99s | 22 APR 1995 |  | Arianna Vanderpool-Wallace |  BAH | 59.62s | 04 MAR 1990 |  | Carolina Colorado |  COL | 1:00.48 | 07 SEP 1987 |  | Jessica Camposano |  COL | 1:00.64 | 26 NOV 1992 |  | Diana Luna |  MEX | 1:00.94 | 26 APR 1991 |  | Marie Laura Meza |  CRC | 1:01.31 | 20 NOV 1990 |  | Belen Diaz |  ARG | 1:01.37 | 19 JUL 1995 |  | Ana Sofia Revilak |  MEX | 1:01.41 | 06 MAR 1997 |  | Isabella Paez |  VEN | 1:01.46 | 29 AUG 1995 |  | Mckenna De Bever |  PER | 1:01.46 | 05 JUN 1996 |  |  Standard A: 1:01.49 |  | Sharon Bravo |  ECU | 1:02.63 | 25 MAY 1994 |  | Tereysa Lehnertz |  PUR | 1:02.67 | 30 NOV 1995 |  | Trudian Patrick |  JAM | 1:02.85 | 21 SEP 1995 |  | Estefania Urzua |  CHI | 1:04.12 | 18 AUG 1999 |  | Dalia Torrez |  NCA | 1:05.13 | 29 MAR 1990 |  | Oreoluwa Cherebin |  GRN | 1:10.15 | 24 DEC 1997 |  |  Standard B: 1:05.18 |   
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