| Event: | Men's 400 metres hurdles |
| Competition: | 2018 World U20 Championships |
| Venue: | Ratina Stadium |
| Dates: | 12, 13 and 14 July |
| Competitors: | 42 |
| Nations: | 31 |
| Win Label: | Winning time |
| Win Value: | 49.42 |
| Gold: | Sokwakhana Zazini |
| Goldnoc: | RSA |
| Silver: | Bassem Hemeida |
| Silvernoc: | QAT |
| Bronze: | Alison Santos |
| Bronzenoc: | BRA |
| Prev: | 2016 |
| Next: | 2021 |
The men's 400 metres hurdles at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 12, 13 and 14 July.[1]
| Standing records prior to the 2021 World Athletics U20 Championships | |||||
|---|---|---|---|---|---|
| World U20 Record | 48.02 | Los Angeles, United States | 17 June 1984 | ||
| Championship Record | 48.51 | Grosseto, Italy | 16 July 2004 | ||
| World U20 Leading | 49.32 | Pretoria, South Africa | 17 March 2018 | ||
Qualification: First 3 of each heat (Q) and the 6 fastest times (q) qualified for the semifinals.[2]
| Rank | Heat | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 1 | 4 | 50.87 | Q, | |||
| 2 | 3 | 51.02 | Q, | |||
| 3 | 4 | 51.08 | Q | |||
| 4 | 2 | 51.16 | Q | |||
| 5 | 5 | 51.21 | Q | |||
| 6 | 5 | 51.29 | Q | |||
| 7 | 4 | 51.35 | Q | |||
| 8 | 4 | 51.39 | q, | |||
| 9 | 6 | 51.54 | Q | |||
| 10 | 2 | 51.59 | Q SB | |||
| 11 | 2 | 51.64 | Q, | |||
| 12 | 3 | 51.65 | Q | |||
| 13 | 3 | 51.75 | Q | |||
| 14 | 3 | 51.83 | q | |||
| 15 | 2 | 51.95 | q | |||
| 16 | 4 | 52.02 | q, | |||
| 17 | 6 | 52.09 | Q | |||
| 18 | 1 | 52.12 | Q | |||
| 19 | 5 | 52.13 | Q | |||
| 20 | 4 | 52.18 | q | |||
| 21 | 3 | 52.24 | q | |||
| 22 | 1 | 52.35 | Q | |||
| 23 | 1 | 52.35 | Q | |||
| 24 | 6 | 52.38 | Q | |||
| 25 | 1 | 52.48 | ||||
| 26 | 5 | 52.59 | ||||
| 27 | 6 | 52.60 | ||||
| 28 | 5 | 52.70 | ||||
| 29 | 1 | 52.80 | ||||
| 30 | 6 | 52.82 | ||||
| 31 | 2 | 52.88 | ||||
| 32 | 3 | 53.02 | ||||
| 33 | 2 | 53.13 | ||||
| 34 | 3 | 53.21 | ||||
| 35 | 5 | 53.43 | ||||
| 36 | 5 | 53.71 | ||||
| 37 | 4 | 53.85 | ||||
| 38 | 1 | 54.82 | ||||
| 39 | 1 | 1:08.85 | ||||
| 2 | ||||||
| 6 | ||||||
| 6 |
Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.[3]
| Rank | Heat | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 1 | 3 | 49.43 | Q | |||
| 2 | 3 | 50.11 | Q, | |||
| 3 | 3 | 50.13 | q, | |||
| 4 | 2 | 50.34 | Q | |||
| 5 | 3 | 50.73 | q, | |||
| 6 | 3 | 50.86 | ||||
| 7 | 1 | 50.90 | Q | |||
| 8 | 2 | 50.98 | Q, | |||
| 9 | 2 | 50.99 | ||||
| 10 | 2 | 51.02 | ||||
| 11 | 1 | 51.14 | Q | |||
| 12 | 2 | 51.21 | ||||
| 13 | 2 | 51.26 | ||||
| 14 | 1 | 51.27 | ||||
| 15 | 1 | 51.55 | ||||
| 16 | 2 | 51.83 | ||||
| 17 | 1 | 51.94 | ||||
| 18 | 3 | 51.99 | ||||
| 19 | 3 | 52.18 | ||||
| 20 | 1 | 52.38 | ||||
| 21 | 1 | 54.45 | ||||
| 22 | 3 | 54.58 | ||||
| 1 | ||||||
| 2 |
| Rank | Lane | Name | Nationality | Time | Note | |
|---|---|---|---|---|---|---|
| 4 | 49.42 | |||||
| 7 | 49.59 | |||||
| 6 | 49.78 | |||||
| 4 | 2 | 49.93 | ||||
| 5 | 3 | 50.25 | ||||
| 6 | 5 | 50.27 | ||||
| 7 | 8 | 51.15 | ||||
| 8 | 1 | 52.38 |