| Final 10:59 | time | gap | L | Reac | 50m |  | 1. Emma McKeon |   Australia | 51.96s | OR | 4 | 0.58 | 25.08s1. |  | 2. Siobhan Bernadette Haughey |   Hong Kong | 52.27s | 0.31s | 5 | 0.68 | 25.10s2. |  | 3. Cate Campbell |   Australia | 52.52s | 0.56s | 3 | 0.79 | 25.19s3. |  | 4. Penny Oleksiak |   Canada | 52.59s | 0.63s | 2 | 0.69 | 25.42s7. |  | 5. Sarah Sjoestroem |   Sweden | 52.68s | 0.72s | 6 | 0.66 | 25.74s8. |  | 6. Femke Heemskerk |   Netherlands | 52.79s | 0.83s | 7 | 0.70 | 25.26s4. |  | 7. Anna Hopkin |   Great Britain | 52.83s | 0.87s | 8 | 0.70 | 25.33s6. |  | 8. Abbey Weitzeil |   United States | 53.23s | 1.27s | 1 | 0.69 | 25.31s5. |   
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| World Record: Sarah Sjoestroem, Sweden 51.71s Budapset, Hungary 23th July 2017 |   
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  |  | Best 8 times advanced to Final.  |   
| Semi 1 |   | time | gap | L | pts | 50m | age |  | 2. Siobhan Bernadette Haughey |   Hong Kong | 52.40s | +0.08s AS | 4 | 961 | 25.10s | 23 |  | 3. Cate Campbell |   Australia | 52.71s | +0.39s | 5 | 944 | 25.32s | 29 |  | 5. Penny Oleksiak |   Canada | 52.86s | +0.54s | 3 | 936 | 25.67s | 21 |  | 6. Femke Heemskerk |   Netherlands | 52.93s | +0.61s | 6 | 932 | 25.55s | 33 |  | 9. Marie Wattel |   France | 53.12s | +0.80s | 1 | 922 | 25.48s | 24 |  | 11.Freya Anderson |   Great Britain | 53.53s | +1.21s | 7 | 901 | 26.13s | 20 |  | 14.Michelle Coleman |   Sweden | 53.73s | +1.41s | 2 | 891 | 25.89s | 27 |  | 16.Qingfeng Wu |   China | 54.86s | +2.54s | 8 | 837 | 25.90s | 18 |   
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| Semi 2 |   | time | gap | L | pts | 50m | age |  | 1. Emma McKeon |   Australia | 52.32s | - | 4 | 965 | 25.27s | 27 |  | 4. Sarah Sjoestroem |   Sweden | 52.82s | +0.50s | 3 | 938 | 25.81s | 27 |  | 7. Abbey Weitzeil |   United States | 52.99s | +0.67s | 2 | 929 | 25.41s | 24 |  | 8. Anna Hopkin |   Great Britain | 53.11s | +0.79s | 5 | 922 | 25.37s | 25 |  | 10.Pernille Blume |   Denmark | 53.26s | +0.94s | 6 | 915 | 25.42s | 27 |  | 12.Signe Bro |   Denmark | 53.55s | +1.23s | 7 | 900 | 25.85s | 22 |  | 13.Erika Connolly |   United States | 53.58s | +1.26s | 8 | 898 | 26.08s | 22 |  | 15.Charlotte Bonnet |   France | 54.10s | +1.78s | 1 | 873 | 26.17s | 26 |   
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| Heat 6 |   | time | gap | L | pts | 50m | age |  | 1. Emma McKeon |   Australia | 52.13s | OR | 4 | 976 | 24.98s | 27 |  | 2. Siobhan Bernadette Haughey |   Hong Kong | 52.70s | +0.57s | 5 | 944 | 25.43s | 23 |  | 3. Anna Hopkin |   Great Britain | 52.75s | +0.62s | 6 | 942 | 25.27s | 25 |  | 8. Junxuan Yang |   China | 53.02s | +0.89s | 6 | 927 | 25.69s | 19 |  | 16.Ranomi Kromowidjojo |   Netherlands | 53.71s | +1.58s | 3 | 892 | 25.56s | 30 |  | 16.Marie Wattel |   France | 53.71s | +1.58s | 2 | 892 | 25.82s | 24 |  | 18.Erika Connolly |   United States | 53.87s | +1.74s | 7 | 884 | 25.54s | 22 |  | 21.Barbora Seemanova |   Czechia | 53.98s | +1.85s | 1 | 879 | 25.87s | 21 |  | 22.Andrea Murez |   Israel | 54.06s | +1.93s | 8 | 875 | 25.77s | 29 |   
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| Heat 5 |   | time | gap | L | pts | 50m | age |  | 5. Sarah Sjoestroem |   Sweden | 52.91s | +0.78s | 4 | 933 | 25.57s | 27 |  | 7. Pernille Blume |   Denmark | 52.96s | +0.83s | 2 | 930 | 25.46s | 27 |  | 9. Femke Heemskerk |   Netherlands | 53.10s | +0.97s | 5 | 923 | 25.46s | 33 |  | 11.Abbey Weitzeil |   United States | 53.21s | +1.08s | 3 | 917 | 25.56s | 24 |  | 13.Signe Bro |   Denmark | 53.54s | +1.41s | 1 | 900 | 25.77s | 22 |  | 15.Charlotte Bonnet |   France | 53.67s | +1.54s | 6 | 894 | 25.86s | 26 |  | 20.Mariia Kameneva |   ROC | 53.92s | +1.79s | 7 | 882 | 25.84s | 22 |  | 24.Janja Segel |   Slovenia | 54.73s | +2.60s | 8 | 843 | 26.05s | 20 |   
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| Heat 4 |   | time | gap | L | pts | 50m | age |  | 23.Fanny Teijonsalo |   Finland | 54.69s | +2.56s | 8 | 845 | 26.38s | 25 |  | 25.Erin Gallagher |   South Africa | 54.75s | +2.62s | 5 | 842 | 25.74s | 22 |  | 26.Maria Ugolkova |   Switzerland | 54.86s | +2.73s | 7 | 837 | 26.32s | 32 |  | 27.Lidon Munoz Del Campo |   Spain | 54.97s | +2.84s | 4 | 832 | 26.00s | 25 |  | 28.Anastasiya Shkurdai |   Belarus | 55.17s | +3.04s | 3 | 823 | 26.75s | 18 |  | 30.Larissa Oliveira |   Brazil | 55.53s | +3.40s | 6 | 807 | 26.37s | 28 |  | 32.Julie Meynen |   Luxembourg | 55.69s | +3.56s | 2 | 800 | 26.90s | 23 |  | 36.Ting Wen Quah |   Singapore | 56.36s | +4.23s | 1 | 772 | 26.81s | 28 |   
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| Heat 3 |   | time | gap | L | pts | 50m | age |  | 29.Kalia Antoniou |   Cyprus | 55.38s | +3.25s | 4 | 814 | 26.45s | 21 |  | 31.Anicka Delgado |   Ecuador | 55.56s | +3.43s | 6 | 806 | 26.47s | 19 |  | 33.Farida Osman |   Egypt | 55.74s | +3.61s | 5 | 798 | 26.46s | 26 |  | 34.Snaefridur Sol Jorunnardottir |   Iceland | 56.15s | +4.02s | 7 | 781 | 27.17s | 20 |  | 35.Bianca-Andreea Costea |   Romania | 56.35s | +4.22s | 1 | 772 | 26.98s | 16 |  | 37.Ieva Maluka |   Latvia | 56.39s | +4.26s | 3 | 771 | 26.77s | 18 |  | 38.Miriam Sheehan |   Puerto Rico | 56.64s | +4.51s | 2 | 760 | 26.78s | 16 |  | 39.Amel Melih |   Algeria | 56.65s | +4.52s | 8 | 760 | 27.15s | 27 |   
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| Heat 2 |   | time | gap | L | pts | 50m | age |  | 40.Mia Blazhevska Eminova |   N. Macedonia | 57.19s | +5.06s | 4 | 739 | 27.24s | 15 |  | 41.Jillian Janis Geohagan Crooks |   Cayman Islands | 57.32s | +5.19s | 3 | 734 | 27.59s | 15 |  | 42.Jenjira Srisa-Ard |   Thailand | 57.42s | +5.29s | 5 | 730 | 27.20s | 26 |  | 43.Maria Victoria Schutzmeier |   Nicaragua | 57.94s | +5.81s | 7 | 710 | 27.78s | 21 |  | 44.Colleen Furgeson |   Marshall Islands | 58.71s | +6.58s | 1 | 683 | 27.97s | 22 |  | 45.Varsenik Manucharyan |   Armenia | 59.18s | +7.05s | 2 | 667 | 28.15s | 18 |  | 46.Jeanne Boutbien |   Senegal | 59.27s | +7.14s | 6 | 664 | 28.06s | 22 |  | 47.Catarina Sousa |   Angola | 59.35s | +7.22s | 8 | 661 | 28.43s | 21 |   
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| Heat 1 |   | time | gap | L | pts | 50m | age |  | 48.Abiola Ogunbanwo |   Nigeria | 59.74s | +7.61s | 3 | 648 | 29.28s | 17 |  | 49.Andela Antunovic |   Montenegro | 1:00.01 | +7.88s | 4 | 639 | 28.87s | 18 |  | 50.Gaurika Singh |   Nepal | 1:00.11 | +7.98s | 5 | 636 | 28.63s | 18 |  | 51.Mineri Kurotori Gomez |   Guam | 1:04.00 | +11.87s | 6 | 527 | 30.44s | 20 |   
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| Final Ranking | Heats | Semi | Final |  | 1. Emma McKeon |   Australia | 52.13s1. | 52.321. | 51.96s |  | 2. Haughey Sb |   Hong Kong | 52.70s2. | 52.402. | 52.27s |  | 3. Cate Campbell |   Australia | 52.80s4. | 52.713. | 52.52s |  | 4. Penny Oleksiak |   Canada | 52.95s6. | 52.865. | 52.59s |  | 5. Sarah Sjoestroem |   Sweden | 52.91s5. | 52.824. | 52.68s |  | 6. Femke Heemskerk |   Netherlands | 53.10s9. | 52.936. | 52.79s |  | 7. Anna Hopkin |   Great Britain | 52.75s3. | 53.118. | 52.83s |  | 8. Abbey Weitzeil |   United States | 53.21s11. | 52.997. | 53.23s |  | 9. Marie Wattel |   France | 53.71s=16. | 53.12s9. |   |  | 10.Pernille Blume |   Denmark | 52.96s7. | 53.26s10. |   |  | 11.Freya Anderson |   Great Britain | 53.61s14. | 53.53s11. |   |  | 12.Signe Bro |   Denmark | 53.54s13. | 53.55s12. |   |  | 13.Erika Brown |   United States | 53.87s=18. | 53.58s13. |   |  | 14.Michelle Coleman |   Sweden | 53.53s12. | 53.73s14. |   |  | 15.Charlotte Bonnet |   France | 53.67s15. | 54.10s15. |   |  | 16.Qingfeng Wu |   China | 53.87s=18. | 54.86s16. |   |  |  eliminated in Heats |  | 17.Junxuan Yang |   China | 53.02s |   |   |  | 18.Kayla Sanchez |   Canada | 53.12s |   |   |  | 19.Ranomi Kromowidjojo |   Netherlands | 53.71s |   |   |  | 20.Mariia Kameneva |   ROC | 53.92s |   |   |  | 21.Barbora Seemanova |   Czechia | 53.98s |   |   |  | 22.Andrea Murez |   Israel | 54.06s |   |   |  | 23.Fanny Teijonsalo |   Finland | 54.69s |   |   |  | 24.Janja Segel |   Slovenia | 54.73s |   |   |  | 25.Erin Gallagher |   South Africa | 54.75s |   |   |  | 26.Maria Ugolkova |   Switzerland | 54.86s |   |   |  | 27.Lidon Munoz del Campo |   Spain | 54.97s |   |   |  | 28.Anastasiya Shkurdai |   Belarus | 55.17s |   |   |  | 29.Kalia Antoniou |   Cyprus | 55.38s |   |   |  | 30.Larissa Oliveira |   Brazil | 55.53s |   |   |  | 31.Anicka Delgado |   Ecuador | 55.56s |   |   |  | 32.Julie Meynen |   Luxembourg | 55.69s |   |   |  | 33.Farida Osman |   Egypt | 55.74s |   |   |  | 34.Jorunnardottir Ss |   Iceland | 56.15s |   |   |  | 35.Bianca-Andreea Costea |   Romania | 56.35s |   |   |  | 36.Ting Wen Quah |   Singapore | 56.36s |   |   |  | 37.Ieva Maluka |   Latvia | 56.39s |   |   |  | 38.Miriam Sheehan |   Puerto Rico | 56.64s |   |   |  | 39.Amel Melih |   Algeria | 56.65s |   |   |  | 40.Mia Blazhevska Eminova |   N. Macedonia | 57.19s |   |   |  | 41.Jillian Crooks |   Cayman Islands | 57.32s |   |   |  | 42.Jenjira Srisa - Ard |   Thailand | 57.42s |   |   |  | 43.Schutzmeier Mv |   Nicaragua | 57.94s |   |   |  | 44.Colleen Furgeson |  MHL | 58.71s |   |   |  | 45.Varsenik Manucharyan |   Armenia | 59.18s |   |   |  | 46.Jeanne Boutbien |   Senegal | 59.27s |   |   |  | 47.Catarina Sousa |   Angola | 59.35s |   |   |  | 48.Abiola Ogunbanwo |   Nigeria | 59.74s |   |   |  | 49.Andela Antunovic |   Montenegro | 1:00.01 |   |   |  | 50.Gaurika Singh |   Nepal | 1:00.11 |   |   |  | 51.Mineri Kurotori Gomez |   Guam | 1:04.00 |   |   |  | 52.Federica Pellegrini |   Italy | DNS |   |   |   
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