Event 303 Womens 100 Metres Breaststroke - Heats
| Name | Age | Federation | Seed | Heats | Split
|
| 1 | HAYWOOD, Kate | 16 | Great Britain | 1:09.82 | 1:09.61 | 32.61 | 1:09.61 |
| 2 | PIDLISNA, Yuliya | 16 | Ukraine | 1:09.76 | 1:10.52 | 33.22 | 1:10.52 |
| 3 | CALLAGHAN, Grace | 15 | Great Britain | 1:10.19 | 1:10.67 | 33.21 | 1:10.67 |
| 4 | DIZDAREVIC, Sanja | 16 | Sweden | 1:12.17 | 1:11.20 | 33.38 | 1:11.20 |
| 5 | DEMOZZI, Veronica | 16 | Italy | 1:10.97 | 1:11.67 | 33.26 | 1:11.67 |
| 6 | HELBIG, Sonja | 16 | Germany | 1:11.23 | 1:11.74 | 33.66 | 1:11.74 |
| 7 | MURAVYEVA, Marina | 16 | Russia | 1:11.85 | 1:11.93 | 34.15 | 1:11.93 |
| 8 | MATSTRUCK, Iryna | 16 | Ukraine | 1:13.44 | 1:12.15 | 34.32 | 1:12.15 |
| 9 | VERESCHAGINA, Ksenia | 16 | Russia | 1:11.85 | 1:12.17 | 34.06 | 1:12.17 |
| 10 | TREPP, Jane | 15 | Estonia | 1:12.63 | 1:12.53 | 34.07 | 1:12.53 |
| 11 | KOZYRAVA, Lizaveta | 16 | Belarus | 1:12.47 | 1:12.74 | 34.42 | 1:12.74 |
| 12 | TSIMAFEYEVA, Iryna | 16 | Belarus | 1:11.68 | 1:12.83 | 34.13 | 1:12.83 |
| 13 | NIJHUIS, Moniek | 15 | Netherlands | 1:12.89 | 1:13.08 | 33.56 | 1:13.08 |
| 14 | SVANBACK, Emma | 16 | Sweden | 1:12.19 | 1:13.27 | 34.18 | 1:13.27 |
| 15 | PEREZ, Sara | 15 | Spain | 1:14.60 | 1:13.54 | 35.96 | 1:13.54 |
| 16 | KRUGER, Natalie | 15 | Germany | 1:12.40 | 1:13.63 | 34.37 | 1:13.63 |
| 17 | FABBRI, Giulia | 16 | Italy | 1:11.31 | 1:13.66 | 34.55 | 1:13.66 |
| 18 | CZAKO, Andea | 15 | Hungary | 1:12.66 | 1:13.79 | 34.72 | 1:13.79 |
| 19 | FORMANKOVA, Petra | 15 | Czech Republic | 1:13.62 | 1:14.09 | 35.21 | 1:14.09 |
| 20 | LACROIX, Heloise | 15 | France | 1:14.15 | 1:14.80 | 34.99 | 1:14.80 |
| 21 | MULTANEN, Sanna | 16 | Finland | 1:14.14 | 1:15.07 | 35.52 | 1:15.07 |
| 22 | RODRIGUEZ, Veronica | 16 | Spain | 1:15.11 | 1:15.11 | 35.00 | 1:15.11 |
| 23 | LEHTONEN, Katja | 15 | Finland | 1:14.52 | 1:15.15 | 34.75 | 1:15.15 |
| 24 | HIGL, Nadja | 16 | Serbia & Monte N | 1:14.99 | 1:15.95 | 35.43 | 1:15.95 |
| 25 | HARALDSDOT, Erla Dogg | 15 | Iceland | 1:15.99 | 1:16.47 | 36.00 | 1:16.47 |
| 25 | SANTOS, Ana | 15 | Portugal | 1:14.27 | 1:16.47 | 37.01 | 1:16.47 |
| 27 | ZUPAN, Katja | 16 | Slovenia | 1:13.80 | 1:16.74 | 34.65 | 1:16.74 |
| 28 | LONNE, Rikke | 15 | Denmark | 1:18.86 | 1:17.27 | 35.69 | 1:17.27 |
| 29 | TOTKOVICOVA, Lucia | 15 | Slovakia | 1:16.67 | 1:17.80 | 36.40 | 1:17.80 |
| 30 | TERZIOGLU, Merve | 16 | Turkey | 1:16.05 | 1:17.92 | 36.32 | 1:17.92 |
| 31 | DINESEN, Amalie | 15 | Denmark | 1:17.15 | 1:21.88 | 38.72 | 1:21.88 |