Heat 4
mercredi 26 juillet 2017, 10h14 GMT – 10h14 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  Katinka Hosszú | Hungary | 2′ 7.25″ |
| 2 |  Yufei Zhang | China | + 0.25″ |
| 3 |  Mireia Belmonte | Spain | + 0.34″ |
| 4 |  Yilin Zhou | China | + 0.47″ |
| 5 | Dakota Luther | United States | + 1.61″ |
| 6 | Alys Thomas | Great Britain | + 1.88″ |
| 7 |  Anja Klinar | Slovenia | + 1.96″ |
| 8 | Barbora Závadová | Czech Republic | + 4.84″ |
| 9 | Anastasia Guzhenkova | Russia | + 6.4″ |
| 10 | Virginia Bardach | Argentina | + 7.9″ |