| Final 10:51 | time | gap | L | Reac | 50m |  | 1. Kaylee McKewon |   Australia | 57.47s | OR | 3 | 0.56 | 28.20s3. |  | 2. Kylie Masse |   Canada | 57.72s | 0.25s | 5 | 0.53 | 27.91s5. |  | 3. Regan Smith |   United States | 58.05s | 0.58s | 4 | 0.59 | 28.24s4. |  | 4. Rhyan Elizabeth White |   United States | 58.43s | 0.96s | 6 | 0.61 | 28.12s6. |  | 5. Emily Seebohm |   Australia | 58.45s | 0.98s | 7 | 0.64 | 28.58s7. |  | 6. Kathleen Dawson |   Great Britain | 58.70s | 1.23s | 2 | 0.62 | 28.40s2. |  | 7. Kira Toussaint |   Netherlands | 59.11s | 1.64s | 1 | 0.51 | 28.39s1. |  | 8. Anastasia Gorbenko |   Israel | 59.53s | 2.06s | 8 | 0.67 | 29.26s8. |   
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| World Record: Kaylee McKewon, Australia 57.45s Adelaide, SA, Australia 13th June 2021 |  | Olympic Record: Regan Smith, United States 57.86s Tokyo, Japan 26th July 2021 |   
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  |  | Best 8 times advanced to Final.  |   
| Semi 1 |   | time | gap | L | pts | 50m | age |  | 1. Regan Smith |   United States | 57.86s | OR | 4 | 985 | 28.32s | 19 |  | 4. Rhyan White |   United States | 58.46s | +0.60 | 3 | 955 | 28.31s | 21 |  | 5. Kathleen Dawson |   Great Britain | 58.56s | +0.70 | 5 | 950 | 28.29s | 23 |  | 8. Anastasia Gorbenko |   Israel | 59.30s | +1.44 | 7 | 915 | 29.46s | 17 |  | 10.Mariia Kameneva |   ROC | 59.49s | +1.63 | 2 | 906 | 29.02s | 22 |  | 11.Margherita Panziera |   Italy | 59.75s | +1.89 | 6 | 894 | 29.11s | 25 |  | 13.Anna Konishi |   Japan | 1:00.07 | +2.21 | 8 | 880 | 29.43s | 25 |  | 14.Cassie Wild |   Great Britain | 1:00.20 | +2.34 | 1 | 874 | 29.25s | 21 |   
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| Semi 2 |   | time | gap | L | pts | 50m | age |  | 2. Kylie Masse |   Canada | 58.09s | +0.23 | 5 | 973 | 28.35s | 25 |  | 3. Kaylee Mckeown |   Australia | 58.11s | +0.25 | 4 | 972 | 28.66s | 20 |  | 6. Emily Seebohm |   Australia | 58.59s | +0.73 | 3 | 948 | 28.73s | 29 |  | 7. Kira Toussaint |   Netherlands | 59.09s | +1.23 | 6 | 924 | 28.58s | 27 |  | 9. Taylor Ruck |   Canada | 59.45s | +1.59 | 7 | 908 | 28.61s | 21 |  | 12.Xuwei Peng |   China | 59.98s | +2.12 | 2 | 884 | 29.16s | 18 |  | 14.Anastasiia Fesikova |   ROC | 1:00.20 | +2.34 | 1 | 874 | 29.23s | 31 |  | 16.Maaike De Waard |   Netherlands | 1:00.49 | +2.63 | 8 | 862 | 28.72s | 24 |   
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| Heat 6 |   | time | gap | L | pts | 50m | age |  | 1. Kaylee McKeown |   Australia | 57.88s | OR | 4 | 984 | 28.24s | 20 |  | 4. Kathleen Dawson |   Great Britain | 58.69s | +0.81 | 5 | 943 | 28.53s | 23 |  | 5. Emily Seebohm |   Australia | 58.86s | +0.98 | 3 | 935 | 28.78s | 29 |  | 14.Cassie Wild |   Great Britain | 59.99s | +2.11 | 2 | 883 | 29.45s | 21 |  | 18.Ingeborg Loyning |   Norway | 1:00.07 | +2.19 | 8 | 880 | 29.52s | 20 |  | 22.Jie Chen |   China | 1:00.63 | +2.75 | 7 | 856 | 29.06s | 26 |  | 24.Laura Riedemann |   Germany | 1:00.81 | +2.93 | 1 | 848 | 29.36s | 23 |  | -. Anastasiya Shkurdai |   Belarus | DNS | - | 6 | - |   | 18 |   
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| Heat 5 |   | time | gap | L | pts | 50m | age |  | 2. Regan Smith |   United States | 57.96s | +0.08s OR | 4 | 979 | 28.36s | 19 |  | 6. Rhyan White |   United States | 59.02s | +1.14 | 5 | 928 | 28.61s | 21 |  | 7. Kira Toussaint |   Netherlands | 59.21s | +1.33 | 3 | 919 | 28.75s | 27 |  | 9. Xuwei Peng |   China | 59.78s | +1.90 | 1 | 893 | 29.08s | 18 |  | 10.Mariia Kameneva |   ROC | 59.88s | +2.00 | 6 | 888 | 29.12s | 22 |  | 15.Maaike De Waard |   Netherlands | 1:00.03 | +2.15 | 7 | 882 | 28.81s | 24 |  | 18.Katalin Burian |   Hungary | 1:00.07 | +2.19 | 8 | 880 | 29.17s | 26 |  | 21.Michelle Coleman |   Sweden | 1:00.54 | +2.66 | 2 | 859 | 28.56s | 27 |   
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| Heat 4 |   | time | gap | L | pts | 50m | age |  | 3. Kylie Masse |   Canada | 58.17s | +0.29s OR | 4 | 969 | 28.19s | 25 |  | 8. Margherita Panziera |   Italy | 59.74s | +1.86 | 3 | 894 | 29.21s | 25 |  | 11.Taylor Ruck |   Canada | 59.89s | +2.01 | 5 | 888 | 28.94s | 21 |  | 12.Anastasia Gorbenko |   Israel | 59.90s | +2.02 | 7 | 887 | 28.94s | 17 |  | 13.Anastasiia Fesikova |   ROC | 59.92s | +2.04 | 6 | 886 | 29.12s | 31 |  | 16.Anna Konishi |   Japan | 1:00.04 | +2.16 | 1 | 881 | 29.35s | 25 |  | 20.Eunji Lee |   South Korea | 1:00.14 | +2.26 | 8 | 877 | 29.00s | 15 |  | 27.Simona Kubova |   Czechia | 1:01.35 | +3.47 | 2 | 826 | 29.41s | 29 |   
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| Heat 3 |   | time | gap | L | pts | 50m | age |  | 17.Mimosa Jallow |   Finland | 1:00.06 | +2.18 | 2 | 880 | 28.98s | 27 |  | 23.Beryl Gastaldello |   France | 1:00.69 | +2.81 | 5 | 853 | 29.17s | 26 |  | 25.Danielle Hill |   Ireland | 1:00.86 | +2.98 | 3 | 846 | 29.47s | 21 |  | 26.Hoi Shun Stephanie Au |   Hong Kong | 1:01.07 | +3.19 | 6 | 837 | 29.38s | 29 |  | 29.Lena Grabowski |   Austria | 1:01.80 | +3.92 | 8 | 808 | 29.49s | 18 |  | 30.Daryna Zevina |   Ukraine | 1:01.97 | +4.09 | 1 | 801 | 30.08s | 26 |  | 32.Isabella Arcila Hurtado |   Colombia | 1:02.28 | +4.40 | 7 | 789 | 29.64s | 27 |  | -. Louise Hansson |   Sweden | DNS | - | 4 | - |   | 24 |   
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| Heat 2 |   | time | gap | L | pts | 50m | age |  | 28.Tatiana Salcutan |   Moldova | 1:01.59 | +3.71 | 5 | 816 | 29.76s | 20 |  | 31.Mckenna De Bever |   Peru | 1:02.09 | +4.21 | 7 | 797 | 30.24s | 25 |  | 33.Ali Galyer |   New Zealand | 1:02.65 | +4.77 | 4 | 775 | 30.65s | 23 |  | 35.Krystal Lara |   Dominicana | 1:03.07 | +5.19 | 6 | 760 | 29.98s | 23 |  | 36.Celina Marquez |   El Salvador | 1:03.75 | +5.87 | 3 | 736 | 30.70s | 22 |  | 37.Danielle Titus |   Barbados | 1:04.53 | +6.65 | 1 | 710 | 31.25s | 18 |  | 38.Felicity Passon |   Seychelles | 1:04.66 | +6.78 | 2 | 705 | 30.59s | 22 |  | 40.Diana Nazarova |   Kazakhstan | 1:06.99 | +9.11 | 8 | 634 | 31.64s | 21 |   
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| Heat 1 |   | time | gap | L | pts | 50m | age |  | 34.Donata Katai |   Zimbabwe | 1:02.73 | +4.85 | 5 | 772 | 30.17s | 17 |  | 39.Maana Patel Patel |   India | 1:05.20 | +7.32 | 4 | 688 | 31.01s | 21 |  | 41.Kimberly Ince |   Grenada | 1:10.24 | +12.36 | 3 | 550 | 32.59s | 16 |   
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| Final Ranking | Heats | Semi | Final |  | 1. Kaylee McKewon |   Australia | 57.88s1. | 58.11s3. | 57.47s |  | 2. Kylie Masse |   Canada | 58.17s3. | 58.09s2. | 57.72s |  | 3. Regan Smith |   United States | 57.96s2. | 57.86s1. | 58.05s |  | 4. Rhyan Elizabeth White |   United States | 59.02s6. | 58.46s4. | 58.43s |  | 5. Emily Seebohm |   Australia | 58.86s5. | 58.59s6. | 58.45s |  | 6. Kathleen Dawson |   Great Britain | 58.69s4. | 58.56s5. | 58.70s |  | 7. Kira Toussaint |   Netherlands | 59.21s7. | 59.09s7. | 59.11s |  | 8. Anastasia Gorbenko |   Israel | 59.90s12. | 59.30s8. | 59.53s |  | 9. Taylor Ruck |   Canada | 59.89s11. | 59.45s9. |   |  | 10.Mariia Kameneva |   ROC | 59.88s10. | 59.49s10. |   |  | 11.Margherita Panziera |   Italy | 59.74s8. | 59.75s11. |   |  | 12.Xuwei Peng |   China | 59.78s9. | 59.98s12. |   |  | 13.Anna Konishi |   Japan | 1:00.0416. | 1:00.0713. |   |  | 14.Cassie Wild |   Great Britain | 59.99s14. | 1:00.2014. |   |  | 14.Anastasiia Fesikova |   ROC | 59.92s13. | 1:00.2015. |   |  | 16.Maaike de Waard |   Netherlands | 1:00.0315. | 1:00.4916. |   |  | 17.Mimosa Jallow |   Finland | 1:00.06 |   |   |  | 18.Katalin Burian |   Hungary | 1:00.07 |   |   |  | 18.Ingeborg Loeyning |   Norway | 1:00.07 |   |   |  | 20.Eunji Lee |   South Korea | 1:00.14 |   |   |  | 21.Michelle Coleman |   Sweden | 1:00.54 |   |   |  | 22.Jie Chen |   China | 1:00.63 |   |   |  | 23.Beryl Gastaldello |   France | 1:00.69 |   |   |  | 24.Laura Riedemann |   Germany | 1:00.81 |   |   |  | 25.Danielle Hill |   Ireland | 1:00.86 |   |   |  | 26.Hoi Shun Stephanie Au |   Hong Kong | 1:01.07 |   |   |  | 27.Simona Kubova |   Czechia | 1:01.35 |   |   |  | 28.Tatiana Salcutan |   Moldova | 1:01.59 |   |   |  | 29.Lena Grabowski |   Austria | 1:01.80 |   |   |  | 30.Daryna Zevina |   Ukraine | 1:01.97 |   |   |  | 31.McKenna de Bever Elliot |   Peru | 1:02.09 |   |   |  | 32.Isabella Arcila Hurtado |   Colombia | 1:02.28 |   |   |  | 33.Ali Galyer |   New Zealand | 1:02.65 |   |   |  | 34.Donata Katai |   Zimbabwe | 1:02.73 |   |   |  | 35.Krystal Lara |   Dominicana | 1:03.07 |   |   |  | 36.Celina Marquez |   El Salvador | 1:03.75 |   |   |  | 37.Danielle Titus |   Barbados | 1:04.53 |   |   |  | 38.Felicity Passon |   Seychelles | 1:04.66 |   |   |  | 39.Maana Patel Patel |   India | 1:05.20 |   |   |  | 40.Diana Nazarova |   Kazakhstan | 1:06.99 |   |   |  | 41.Kimberly Ince |   Grenada | 1:10.24 |   |   |  | 42.Louise Hansson |   Sweden | DNS |   |   |  | 42.Anastasiya Shkurdai |   Belarus | DNS |   |   |   
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| Total eligible to participate -- swimmers (started --) |   
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