# 2018 IAAF World U20 Championships – Women's 400 metres hurdles

The women's 400 metres hurdles at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 11, 12 and 13 July.

## Records

Standing records prior to the 2018 IAAF World U20 Championships in Athletics :
| World Junior Record | Sydney McLaughlin (USA) | 53.60 | Fayetteville, United States | 27 April 2018 |
| Championship Record | Lashinda Demus (USA) | 54.70 | Kingston, Jamaica | 19 July 2002 |
| World Junior Leading | Sydney McLaughlin (USA) | 52.75 | Knoxville, Tennessee, United States | 13 May 2018 |

## Results
### Heats

Qualification: First 3 of each heat (Q) and the 6 fastest times (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 2 | Zenéy van der Walt | South Africa | 57.78 | Q |
| 2 | 3 | Xahria Santiago | Canada | 58.09 | Q |
| 3 | 5 | Shiann Salmon | Jamaica | 58.14 | Q |
| 4 | 4 | Yasmin Giger | Switzerland | 58.18 | Q |
| 5 | 3 | Sara Gallego | Spain | 58.27 | Q |
| 6 | 1 | Brooke Jaworski | United States | 58.42 | Q |
| 7 | 4 | Emma Zapletalová | Slovakia | 58.45 | Q |
| 8 | 1 | Sanique Walker | Jamaica | 58.45 | Q |
| 9 | 5 | Natalia Wosztyl | Poland | 58.46 | Q |
| 10 | 1 | Sylvia Schulz | Germany | 58.79 | Q |
| 11 | 5 | Nea Mattila | Finland | 58.82 | Q, PB |
| 12 | 6 | Sára Mátó | Hungary | 58.88 | Q |
| 13 | 6 | Jurnee Woodward | United States | 58.91 | Q |
| 14 | 3 | Marlene Santos | Brazil | 59.00 | Q |
| 15 | 2 | Viivi Lehikoinen | Finland | 59.10 | Q |
| 16 | 3 | Iulia Nicoleta Banaga | Romania | 59.10 | q, SB |
| 17 | 2 | Moeka Sekimoto | Japan | 59.16 | Q, SB |
| 18 | 2 | Jarmillia Murphy-Knight | Australia | 59.19 | q, PB |
| 19 | 4 | Chayenne da Silva | Brazil | 59.26 | Q |
| 20 | 4 | Solveig Vråle | Norway | 59.28 | q |
| 21 | 3 | Valeria Cabezas | Colombia | 59.52 | q, PB |
| 22 | 2 | Rūta Okulič-Kazarinaitė | Lithuania | 59.58 | q, PB |
| 23 | 6 | Gabija Galvydytė | Lithuania | 59.66 | Q, SB |
| 24 | 1 | Maria Fernanda Matos | Dominican Republic | 59.71 | q |
| 25 | 4 | Lisa Sophie Hartmann | Germany | 59.76 | |
| 26 | 3 | Annamaria Leszczynska | Australia | 59.94 | |
| 27 | 4 | Noura Ennadi | Morocco | 59.95 | PB |
| 28 | 1 | Janka Molnár | Hungary | 1:00.13 | SB |
| 29 | 6 | Marie Skjæggestad | Norway | 1:00.17 | |
| 30 | 2 | Jiadie Mo | China | 1:00.44 | |
| 31 | 5 | Kasumi Yoshida | Japan | 1:00.61 | |
| 32 | 5 | Valiantsina Chymbar | Belarus | 1:00.90 | |
| 33 | 6 | Loubna Benhadja | Algeria | 1:01.24 | |
| 34 | 4 | Maryana Shostak | Ukraine | 1:01.26 | |
| 35 | 6 | Tianlu Lan | China | 1:01.45 | |
| 36 | 1 | Lucie Krupařová | Czech Republic | 1:01.49 | |
| 37 | 4 | Anna Polinari | Italy | 1:01.59 | |
| 38 | 6 | Rogail Joseph | South Africa | 1:01.68 | |
| 39 | 1 | Tjaša Želenzik | Slovenia | 1:01.73 | |
| 40 | 1 | Alina Sharkova | Authorised Neutral Athletes | 1:02.20 | |
| 41 | 3 | Tetyana Bezshyyko | Ukraine | 1:02.35 | |
| 42 | 5 | Megan Champoux | Canada | 1:02.93 | |
| 43 | 3 | Beatrice Berti | San Marino | 1:03.19 | NJR |
| 44 | 6 | Barbora Veselá | Czech Republic | 1:03.44 | |
| 45 | 5 | Jui-Hsuan Yang | Chinese Taipei | 1:04.56 | |
| | 2 | Piibe Kirke Aljas | Estonia | DNF | |

### Semifinals

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 2 | Shiann Salmon | Jamaica | 56.29 | Q |
| 2 | 1 | Zenéy van der Walt | South Africa | 56.72 | Q |
| 3 | 1 | Sara Gallego | Spain | 57.18 | Q, NJR |
| 4 | 3 | Emma Zapletalová | Slovakia | 57.22 | Q, NJR |
| 5 | 2 | Yasmin Giger | Switzerland | 57.44 | Q |
| 6 | 3 | Xahria Santiago | Canada | 57.55 | Q |
| 7 | 3 | Brooke Jaworski | United States | 57.57 | q, PB |
| 8 | 2 | Natalia Wosztyl | Poland | 57.68 | q, PB |
| 9 | 1 | Viivi Lehikoinen | Finland | 57.70 | SB |
| 10 | 1 | Maria Fernanda Matos | Dominican Republic | 57.74 | NJR |
| 11 | 1 | Sára Mátó | Hungary | 57.83 | NJR |
| 12 | 2 | Jurnee Woodward | United States | 58.20 | |
| 13 | 3 | Nea Mattila | Finland | 58.26 | PB |
| 14 | 1 | Iulia Nicoleta Banaga | Romania | 58.59 | PB |
| 15 | 1 | Sylvia Schulz | Germany | 58.79 | |
| 16 | 1 | Gabija Galvydytė | Lithuania | 58.88 | NJR |
| 17 | 2 | Solveig Vråle | Norway | 58.96 | |
| 18 | 3 | Chayenne da Silva | Brazil | 59.19 | |
| 19 | 2 | Moeka Sekimoto | Japan | 59.48 | |
| 20 | 3 | Jarmillia Murphy-Knight | Australia | 59.69 | |
| 21 | 3 | Rūta Okulič-Kazarinaitė | Lithuania | 59.83 | |
| 22 | 2 | Valeria Cabezas | Colombia | 1:00.53 | |
| 23 | 2 | Marlene Santos | Brazil | 1:00.53 | |
| 24 | 3 | Sanique Walker | Jamaica | DNS | |

### Final

| Rank | Lane | Name | Nationality | Time | Note |
| | 5 | Zenéy van der Walt | South Africa | 55.34 | |
| | 4 | Shiann Salmon | Jamaica | 56.11 | |
| | 8 | Yasmin Giger | Switzerland | 56.98 | SB |
| 4 | 6 | Sara Gallego | Spain | 57.11 | NJR |
| 5 | 3 | Emma Zapletalová | Slovakia | 57.35 | |
| 6 | 2 | Natalia Wosztyl | Poland | 58.17 | |
| 7 | 1 | Brooke Jaworski | United States | 58.43 | |
| 8 | 7 | Xahria Santiago | Canada | 58.49 | |