Heat 4 10.08 20:25 | Team | time | L | Rk. | 1. Camelia Alina Potec | ROU | 4:04.55 | 6 | 7. | 2. Laure Manaudou | FRA | 4:04.93 | 4 | 8. | 3. Otylia Jedrzejczak | POL | 4:05.50 | 5 | 9. | 4. Linda Mackenzie | AUS | 4:05.91 | 3 | 10. | 5. Joerdis Steinegger | AUT | 4:09.72 | 8 | 16. | 6. Savannah King | CAN | 4:11.49 | 1 | 19. | 7. Miao Tan | CHN | 4:12.35 | 7 | 22. | 8. Erika Villaecija | ESP | 4:14.25 | 2 | 23. |
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Heat 3 10.08 20:18 | Team | time | L | Rk. | 1. Susana Escobar | MEX | 4:11.99 | 3 | 20. | 2. Monique Ferreira | BRA | 4:12.21 | 5 | 21. | 3. Hoi Shun Stephanie Au | HKG | 4:14.82 | 6 | 24. | 4. Eleftheria Evgenia Efstathiou | GRE | 4:15.78 | 2 | 27. | 5. Daria Belyakina | RUS | 4:16.21 | 4 | 28. | 6. Lynette Lim | SIN | 4:17.67 | 1 | 30. | 7. Cecilia Elizabeth Biagioli | ARG | 4:19.85 | 7 | 34. | 8. Chin-Kuei Yang | TPE | 4:24.78 | 8 | 40. |
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