| Final 17:55 | time | | L | React. | bib | | 1. Isaac Makwala |  BOT | 44.35s | | 5 | 0.191 | 36 | | 2. Boniface Mweresa |  KEN | 45.01s | SB | 8 | 0.172 | 321 | | 3. Onkabetse Nkobolo | BOT | 45.50s | | 6 | 0.207 | 41 | | 4. Alex Sampao | KEN | 45.59s | | 4 | 0.216 | 330 | | 5. Sadam Elnour |  SUD | 45.69s | | 9 | 0.227 | 537 | | 6. Orukpe Erayokan |  NGR | 45.73s | | 7 | 0.234 | 408 | | 7. Raymond Kibet | KEN | 45.79s | | 3 | 0.206 | 295 | | 8. Saviour Kombe |  ZAM | 46.65s | | 2 | 0.203 | 580 |
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| Records | | Rec | Athlete | time | Birth | Venue | date | | WR | Michael Johnson |  USA | 43.18s | 1967 | Sevilla | 26/08/1999 | | AR | Wayde Van Niekerk |  RSA | 43.48s | 1992 | Beijing | 26/08/2015 | | CR | Innocent Egbunike | NGR | 44.23s | | Nairobi | 1987 |
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Semi-Finals - Monday 14.09 Afternoon session | | First 2 and best 2 progress to Final. |
| Ranking | time | | L | React. | bib | | 1. Isaac Makwala | BOT | 44.87s | | 6 | 0.219 | 36 | | 2. Boniface Mweresa | KEN | 45.15s | SB | 5 | 0.212 | 321 | | 3. Ofentse Mogawane | RSA | 45.75s | | 7 | 0.178 | 464 | | 4. Nathaniel Sa Oghenewegba | NGR | 45.80s | | 4 | 0.174 | 424 | | 5. Daniel Gyasi |  GHA | 46.45s | | 8 | 0.195 | 268 | | 6. Denis Opio |  UGA | 47.39s | | 3 | 0.159 | 574 | | 7. Ernst Narib |  NAM | 47.49s | | 9 | 0.276 | 397 | | -. Marie Heddy |  SEY | DNS | | 2 | | 502 |
| Ranking | time | | L | React. | bib | | 1. Orukpe Erayokan | NGR | 44.95s | | 7 | 0.242 | 408 | | 2. Onkabetse Nkobolo | BOT | 45.10s | SB | 5 | 0.223 | 41 | | 3. Raymond Kibet | KEN | 45.66s | SB | 6 | 0.196 | 295 | | 4. Emmanuel Dasor | GHA | 46.02s | | 4 | 0.152 | 264 | | 5. George Effah | GHA | 46.65s | SB | 9 | 0.205 | 265 | | 6. Kenenisa Hailu |  ETH | 46.83s | | 8 | 0.205 | 210 | | 7. Mahamat Bachir Ahmat |  CHA | 47.13s | SB | 3 | 0.206 | 106 | | -. Mohamed Khouaja |  LBA | DNS | | 2 | | 339 |
| Ranking | time | | L | React. | bib | | 1. Alex Sampao | KEN | 45.31s | SB | 4 | 0.236 | 330 | | 2. Sadam Elnour | SUD | 45.41s | | 6 | 0.136 | 537 | | 3. Saviour Kombe | ZAM | 45.57s | SB | 7 | 0.199 | 580 | | 4. Leaname Maotoanong | BOT | 45.99s | | 8 | 0.172 | 37 | | 5. Rodwell Ndhlovu |  ZIM | 46.04s | | 5 | 0.176 | 591 | | 6. Diakalia Bamba |  MLI | 46.96s | | 3 | 0.187 | 358 | | 7. Mamadou Gueye |  SEN | 47.26s | | 2 | 0.149 | 494 | | -. Robert Simmonson | NGR | DNF | | 9 | | 440 |
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| Ranking | time | | L | React. | bib | | 1. Sadam Elnour | SUD | 45.85s | | 6 | 0.172 | 537 | | 2. Nathaniel Sa Oghenewegba | NGR | 46.24s | | 2 | 0.164 | 424 | | 3. Raymond Kibet | KEN | 46.67s | | 3 | 0.194 | 295 | | 4. George Effah | GHA | 46.79s | | 4 | 0.186 | 265 | | 5. Leaname Maotoanong | BOT | 47.16s | | 5 | 0.161 | 37 | | 6. Marie Heddy | SEY | 47.70s | | 7 | 0.350 | 502 | | 7. Leonard Opiny | UGA | 48.40s | | 8 | 0.283 | 573 | | 8. Fasum Tesfahuney |  ERI | 49.54s | | 1 | 0.201 | 176 | | 9. Joseph Sinkala | ZAM | 49.55s | | 9 | 0.169 | 586 |
| Ranking | time | | L | React. | bib | | 1. Alex Sampao | KEN | 46.10s | | 9 | 0.193 | 330 | | 2. Emmanuel Dasor | GHA | 46.27s | | 5 | 0.148 | 264 | | 3. Ofentse Mogawane | RSA | 46.70s | | 7 | 0.237 | 464 | | 4. Ernst Narib | NAM | 47.07s | | 6 | 0.268 | 397 | | 5. Diakalia Bamba | MLI | 47.39s | | 3 | 0.135 | 358 | | 6. Haji Ture | ETH | 49.01s | | 4 | 0.213 | 239 | | -. Gilles Anthony Afoumba |  CGO | DQ | | 8 | | 60 | | -. Retselistisoe Gsoeu |  LES | DNS | | 2 | | 340 |
| Ranking | time | | L | React. | bib | | 1. Onkabetse Nkobolo | BOT | 45.46s | | 9 | 0.261 | 41 | | 2. Orukpe Erayokan | NGR | 45.84s | | 2 | 0.255 | 408 | | 3. Saviour Kombe | ZAM | 46.12s | | 8 | 0.129 | 580 | | 4. Daniel Gyasi | GHA | 46.43s | | 5 | 0.270 | 268 | | 5. Mahamat Bachir Ahmat | CHA | 47.19s | Sb | 7 | 0.223 | 106 | | 6. Denis Opio | UGA | 47.27s | | 6 | 0.161 | 574 | | 7. Mamadou Gueye | SEN | 47.49s | | 1 | 0.151 | 494 | | 8. Bockarie Sesay |  SLE | 50.17s | | 3 | 0.183 | 514 | | -. Fikru Abu | ETH | DNS | | 4 | | 181 |
| Ranking | time | | L | React. | bib | | 1. Isaac Makwala | BOT | 45.63s | | 8 | 0.283 | 36 | | 2. Boniface Mweresa | KEN | 45.83s | | 7 | 0.172 | 321 | | 3. Rodwell Ndhlovu | ZIM | 46.40s | | 3 | 0.180 | 591 | | 4. Robert Simmonson | NGR | 46.60s | | 2 | 0.184 | 440 | | 5. Kenenisa Hailu | ETH | 47.19s | | 9 | 0.168 | 210 | | 6. Mohamed Khouaja | LBA | 47.82s | | 6 | | 339 | | 7. Gustave Ndadobo | CGO | 48.59s | | 1 | 0.153 | 89 | | 8. Ibdalazim Mohamed | SUD | 49.90s | | 4 | 0.155 | 542 | | -. Gatkuoth Ruben Yutchol |  SSD | DNS | | 5 | | 528 |
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