# 2018 IAAF World U20 Championships – Men's 800 metres

The men's 800 metres at the 2018 IAAF World U20 Championships was held at Ratina Stadium on 13, 14 and 15 July.

## Records

Standing records prior to the 2018 IAAF World U20 Championships in Athletics :
| World Junior Record | Nijel Amos (BOT) | 1:41.73 | London, United Kingdom | 9 August 2012 |
| Championship Record | Nijel Amos (BOT) | 1:43.79 | Barcelona, Spain | 15 July 2012 |
| World Junior Leading | Tolesa Bodena (ETH) | 1:45.56 | Huelva, Spain | 8 June 2018 |

## Results
### Heats

Qualification: First 3 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 3 | Solomon Lekuta | Kenya | 1:48.19 | Q |
| 2 | 3 | Marino Bloudek | Croatia | 1:48.54 | Q |
| 3 | 3 | Markhim Lonsdale | Great Britain | 1:48.60 | Q, SB |
| 4 | 3 | Adisu Girma | Ethiopia | 1:48.60 | q |
| 5 | 1 | Josh Hoey | United States | 1:48.86 | Q |
| 6 | 1 | Eliott Crestan | Belgium | 1:48.92 | Q |
| 7 | 4 | Ngeno Kipngetich | Kenya | 1:49.03 | Q |
| 8 | 1 | Sven Cepuš | Croatia | 1:49.03 | Q, SB |
| 9 | 1 | Juan Diego Castro | Costa Rica | 1:49.18 | q, NJR |
| 10 | 3 | Pieter Sisk | Belgium | 1:49.40 | q |
| 11 | 3 | Oussama Cherrad | Algeria | 1:49.40 | q, PB |
| 12 | 4 | Marcelo Pereira | Portugal | 1:49.49 | Q, PB |
| 13 | 4 | Rey Rivera | United States | 1:49.53 | Q |
| 14 | 4 | Eduardo Romero | Spain | 1:49.56 | |
| 15 | 1 | Beant Singh | India | 1:49.66 | |
| 16 | 2 | Simone Barontini | Italy | 1:49.73 | Q |
| 17 | 1 | Mohamed Abouettahery | Morocco | 1:50.15 | |
| 18 | 3 | Lachlan Raper | Australia | 1:50.23 | |
| 19 | 2 | Alex Botterill | Great Britain | 1:50.26 | Q |
| 20 | 4 | Andrea Romani | Italy | 1:50.28 | |
| 21 | 4 | Marco Vilca | Peru | 1:50.47 | |
| 22 | 2 | Mehmet Çelik | Turkey | 1:50.61 | Q |
| 23 | 2 | Kimar Farquharson | Jamaica | 1:50.76 | |
| 24 | 1 | Archie Wallis | Australia | 1:51.25 | |
| 25 | 2 | Ruach Chuol Padhal | Canada | 1:51.61 | |
| 26 | 2 | Lőrinc Varga | Hungary | 1:51.67 | |
| 27 | 1 | Oskar Schwarzer | Germany | 1:52.39 | |
| 28 | 4 | Charaf Zahir | Morocco | 1:52.95 | |
| | 2 | Teddese Lemi | Ethiopia | DQ | |

### Semifinals

Qualification: First 3 of each heat (Q) and the 2 fastest times (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 2 | Ngeno Kipngetich | Kenya | 1:46.81 | Q |
| 2 | 2 | Eliott Crestan | Belgium | 1:46.84 | Q, NJR |
| 3 | 2 | Simone Barontini | Italy | 1:47.35 | Q, PB |
| 4 | 2 | Oussama Cherrad | Algeria | 1:47.36 | q, PB |
| 5 | 1 | Solomon Lekuta | Kenya | 1:47.56 | Q |
| 6 | 2 | Markhim Lonsdale | Great Britain | 1:47.73 | q, SB |
| 7 | 1 | Adisu Girma | Ethiopia | 1:47.88 | Q |
| 8 | 1 | Alex Botterill | Great Britain | 1:47.97 | Q |
| 9 | 1 | Josh Hoey | United States | 1:48.07 | PB |
| 10 | 2 | Marino Bloudek | Croatia | 1:48.20 | , SB |
| 11 | 1 | Sven Cepuš | Croatia | 1:48.38 | PB |
| 12 | 1 | Mehmet Çelik | Turkey | 1:48.53 | PB |
| 13 | 1 | Juan Diego Castro | Costa Rica | 1:49.13 | NJR |
| 14 | 1 | Pieter Sisk | Belgium | 1:49.82 | |
| 15 | 2 | Rey Rivera | United States | 1:50.48 | |
| 16 | 2 | Marcelo Pereira | Portugal | 1:57.88 | |

### Final

| Rank | Lane | Name | Nationality | Time | Note |
| | 5 | Solomon Lekuta | Kenya | 1:46.35 | |
| | 4 | Ngeno Kipngetich | Kenya | 1:46.45 | PB |
| | 6 | Eliott Crestan | Belgium | 1:47.27 | |
| 4 | 2 | Adisu Girma | Ethiopia | 1:47.58 | PB |
| 5 | 3 | Simone Barontini | Italy | 1:51.08 | |
| 6 | 1 | Alex Botterill | Great Britain | 1:51.64 | |
| 7 | 7 | Markhim Lonsdale | Great Britain | 1:57.39 | |
| | 8 | Oussama Cherrad | Algeria | DQ | |