400m GIRLS , Heat:1 of 3 ; Official result since 17:07
| Rank | Lane | ID | Name | SB | Team | Cat | Result | Info | Video |
| 1 | 7 | 383 | ALEKSEEVA Ekaterina | 54.99 | RUS | Youth | 56.11 | Q | |
| 2 | 5 | 83 | KOUNTOURI Kalliopi | 56.30 | CYP | Youth | 56.24 | Q | |
| 3 | 8 | 274 | KOBLENCE Aleksandra | 56.49 | LAT | Youth | 56.29 | q | |
| 4 | 2 | 112 | DORDA SANS Sara | 57.84 | ESP | Youth | 58.03 | ||
| 5 | 3 | 191 | MARTINENKO Mariam | 59.70 | GEO | Youth | 59.11 | ||
| 6 | 6 | 65 | TODOROVA Polina | 59.23 | BUL | Youth | 59.11 | ||
| 7 | 4 | 369 | BALAN Cristina Daniela | 57.66 | ROU | Youth | 59.76 |