| Final Saturday 19.03 19:05 | time | | L | React. | bib | | 1. Pavel Maslák |  CZE | 45.44s | | 5 | 0.185 | 171 | | 2. Abdalelah Haroun |  QAT | 45.59s | SB | 3 | 0.204 | 321 | | 3. Deon Lendore |  TTO | 46.17s | | 4 | 0.214 | 350 | | 4. Bralon Taplin |  GRN | 46.56s | | 6 | 0.138 | 233 | | 5. Boniface Ontuga Mweresa |  KEN | 46.86s | | 2 | 0.186 | 269 | | 6. Lalonde Gordon | TTO | 47.62s | | 1 | 0.135 | 349 |
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| Qualification Standard: 46.70s | | Qualification Standard Outdoor: 45.10s |
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| | - Friday 19.03 - First 3 progress to Final. |
| Semi 1 19:45 | time | | L | React | bib | Rk | | 1. Bralon Taplin | GRN | 45.38s | Q | 6 | 0.192 | 233 | 1. | | 2. Deon Lendore | TTO | 46.23s | Q | 5 | 0.198 | 350 | 5. | | 3. Boniface Ontuga Mweresa | KEN | 46.33s | Q SB | 4 | 0.209 | 269 | 6. | | 4. Nery Brenes |  CRC | 46.49s | SB | 2 | 0.155 | 161 | 7. | | 5. Kyle Clemons |  USA | 46.91s | | 1 | 0.197 | 376 | 9. | | -. Luka Janežic |  SLO | DQ R163.3(b) | 3 | 0.185 | 337 | |
| Semi 2 19:53 | time | | L | React | bib | Rk | | 1. Pavel Maslák | CZE | 45.71s | Q | 6 | 0.181 | 171 | 2. | | 2. Abdalelah Haroun | QAT | 45.71s | Q SB | 5 | 0.208 | 321 | 3. | | 3. Lalonde Gordon | TTO | 46.03s | Q | 4 | 0.127 | 349 | 4. | | 4. Yavuz Can |  TUR | 46.82s | | 3 | 0.204 | 358 | 8. | | 5. Alonzo Russell |  BAH | 47.07s | | 1 | 0.237 | 114 | 10. | | 6. Fitzroy Dunkley |  JAM | 47.13s | | 2 | 0.170 | 248 | 11. |
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| | | Friday 18.03 - First 2 + Best 2 progress to Semi-Finals. |
| Heat 1 11:45 | time | | L | React | bib | Rk | | 1. Deon Lendore | TTO | 46.38s | Q | 5 | 0.244 | 350 | 3. | | 2. Boniface Ontuga Mweresa | KEN | 46.44s | Q SB | 4 | 0.271 | 269 | 4. | | 3. Kyle Clemons | USA | 46.66s | q | 6 | 0.206 | 376 | 6. | | 4. Alonzo Russell | BAH | 46.66s | q | 3 | 0.244 | 114 | 7. | | 5. George Erazo |  ESA | 49.66s | | 2 | 0.188 | 180 | 24. | | -. Sadam Suliman Koumi |  SUD | DNS | | 1 | | 339 | |
| Heat 2 11:52 | time | | L | React | bib | Rk | | 1. Lalonde Gordon | TTO | 46.72s | Q | 5 | 0.174 | 349 | 8. | | 2. Fitzroy Dunkley | JAM | 46.83s | Q | 6 | 0.161 | 248 | 11. | | 3. Lucas Bua |  ESP | 46.86s | | 4 | 0.174 | 183 | 12. | | 4. Philip Osei |  CAN | 47.00s | | 3 | 0.196 | 146 | 14. | | 5. Gustavo Cuesta |  DOM | 48.46s | | 1 | 0.173 | 177 | 23. | | -. Orukpe Eraiyokan |  NGR | DNSs | | 2 | | 289 | |
| Heat 3 11:59 | time | | L | React | bib | Rk | | 1. Bralon Taplin | GRN | 46.24s | Q | 5 | 0.195 | 233 | 2. | | 2. Yavuz Can | TUR | 46.82s | Q | 6 | 0.206 | 358 | 10. | | 3. Ricardo Chambers | JAM | 47.07s | | 1 | 0.155 | 247 | 16. | | 4. Marek Niit |  EST | 47.39s | | 3 | 0.136 | 194 | 18. | | 5. Alberth Bravo |  VEN | 47.63s | PB | 2 | 0.197 | 398 | 21. | | 6. Emmanuel Dasor |  GHA | 47.86s | | 4 | 0.198 | 226 | 22. |
| Heat 4 12:06 | time | | L | React | bib | Rk | | 1. Abdalelah Haroun | QAT | 46.15s | Q | 6 | 0.201 | 321 | 1. | | 2. Nery Brenes | CRC | 46.92s | Q SB | 2 | 0.179 | 161 | 13. | | 3. Chidi Okezie | NGR | 47.05s | | 4 | 0.276 | 401 | 15. | | 4. Batuhan Altintas | TUR | 47.21s | | 3 | 0.218 | 357 | 17. | | 5. Kristijan Efremov |  MKD | 50.28s | | 1 | 0.193 | 280 | 26. | | -. Vernon Norwood | USA | DQ R163.3(b) | 5 | | 389 | |
| Heat 5 12:13 | time | | L | React | bib | Rk | | 1. Pavel Maslák | CZE | 46.57s | Q | 5 | 0.178 | 171 | 5. | | 2. Luka Janežic | SLO | 46.79s | Q | 4 | 0.235 | 337 | 9. | | 3. Liemarvin Bonevacia |  NED | 47.48s | | 3 | 0.145 | 285 | 19. | | 4. Payton Hazzard | GRN | 47.61s | | 1 | 0.207 | 232 | 20. | | 5. Mowen Boino |  PNG | 49.81s | PB | 2 | 0.213 | 308 | 25. | | -. Michael Mathieu | BAH | DQ R163.3(b) | 6 | 0.197 | 112 | |
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| Athlete | 2016 | Best | bib | Heat | L | | 4. Bralon Taplin | GRN | 45.20s | 45.20s | 233 | Heat 3 | 5 | | 6. Lalonde Gordon | TTO | 45.51s | 45.17s | 349 | Heat 2 | 5 | | 3. Deon Lendore | TTO | 45.56s | 45.03s | 350 | Heat 1 | 5 | | -. Vernon Norwood | USA | 45.80s | 45.31s | 389 | Heat 4 | 5 | | 2. Abdalelah Haroun | QAT | 45.88s | 45.39s | 321 | Heat 4 | 6 | | -. Kyle Clemons | USA | 45.95s | 45.60s | 376 | Heat 1 | 6 | | 1. Pavel Maslák | CZE | 46.02s | 45.24s | 171 | Heat 5 | 5 | | -. Fitzroy Dunkley | JAM | 46.04s | 46.04s | 248 | Heat 2 | 6 | | -. Michael Mathieu | BAH | 46.05s | 46.05s | 112 | Heat 5 | 6 | | -. Yavuz Can | TUR | 46.20s | 46.20s | 358 | Heat 3 | 6 | | -. Emmanuel Dasor | GHA | 46.21s | 46.21s | 226 | Heat 3 | 4 | | -. Luka Janežic | SLO | 46.32s | 46.32s | 337 | Heat 5 | 4 | | -. Philip Osei | CAN | 46.35s | 46.35s | 146 | Heat 2 | 3 | | 5. Boniface Ontuga Mweresa | KEN | 46.46s | 46.46s | 269 | Heat 1 | 4 | | -. Chidi Okezie | NGR | 46.48s | 46.48s | 401 | Heat 4 | 4 | | -. Batuhan Altintas | TUR | 46.55s | 46.55s | 357 | Heat 4 | 3 | | -. Alonzo Russell | BAH | 46.58s | 46.44s | 114 | Heat 1 | 3 | | -. Lucas Bua | ESP | 46.65s | 46.65s | 183 | Heat 2 | 4 | | -. Liemarvin Bonevacia | NED | 46.66s | 46.46s | 285 | Heat 5 | 3 | | No Qualification Standard 46.70s in 2016. | | -. Marek Niit | EST | 46.81s | 45.99s | 194 | Heat 3 | 3 | | -. Ricardo Chambers | JAM | 46.85s | 45.64s | 247 | Heat 3 | 1 | | -. Payton Hazzard | GRN | 47.03s | 46.60s | 232 | Heat 5 | 1 | | -. Gustavo Cuesta | DOM | 48.21s | 45.95s | 177 | Heat 2 | 1 | | -. George Erazo | ESA | 49.46s | 48.65s | 180 | Heat 1 | 2 | | -. Kristijan Efremov | MKD | 49.49s | 49.49s | 280 | Heat 4 | 1 | | -. Orukpe Eraiyokan | NGR | | 44.95os | 289 | Heat 2 | 2 | | -. Nery Brenes | CRC | | 45.11s | 161 | Heat 4 | 2 | | -. Alberth Bravo | VEN | | 45.21os | 398 | Heat 3 | 2 | | -. Mowen Boino | PNG | | 47.97os | 308 | Heat 5 | 2 | | -. Sadam Suliman Koumi | SUD | | 48.67s | 339 | Heat 1 | 1 |
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