| Final: Start time: 21:34 +1 UTC, Temperature 15° C, Humidity 88 % _ |
| Final Ranking | time | | L | Q | React. | bib | | 1. Karsten Warholm |  NOR | 48.35s | | 5 | 2. | 0.175 | 1216 | | 2. Yasmani Copello |  TUR | 48.49s | | 8 | 6. | 0.211 | 1345 | | 3. Kerron Clement |  USA | 48.52s | | 4 | 1. | 0.153 | 1385 | | 4. Kemar Mowatt |  JAM | 48.99s | | 3 | 4. | 0.189 | 1092 | | 5. TJ Holmes | USA | 49.00s | | 7 | 7. | 0.210 | 1405 | | 6. Juander Santos |  DOM | 49.04s | | 2 | 3. | 0.158 | 844 | | 7. Abderrahaman Samba |  QAT | 49.74s | | 6 | 5. | 0.206 | 1268 | | 8. Kariem Hussein |  SUI | 50.07s | | 9 | 8. | 0.163 | 1298 |
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| | | Qualifiyng standard: 49.35s | | Event Target Number: 40 Athletes. | | Round 1 - Sunday 06.08 13:05 |
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| | | First 2 and best 2 advanced to Final. |
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| | | Temperature 19° C, Humidity 56 |
| Ranking | time | | L | Rk | React. | bib | | 1. Kerron Clement | USA | 48.35s | | 7 | 1. | 0.156 | 1385 | | 2. Karsten Warholm | NOR | 48.43s | | 5 | 2. | 0.175 | 1216 | | 3. Juander Santos | DOM | 48.59s | PB | 4 | 3. | 0.192 | 844 | | 4. Kemar Mowatt | JAM | 48.66s | | 3 | 4. | 0.204 | 1092 | | 5. Abdelmalik Lahoulou |  ALG | 49.33s | | 8 | 10. | 0.186 | 606 | | 6. Patryk Dobek |  POL | 49.40s | | 6 | 11. | 0.158 | 1236 | | 7. Victor Coroller |  FRA | 55.69s | | 2 | 21. | 0.170 | 922 | | -. Thomas Barr |  IRL | DNS | | 9 | | | 1053 |
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| | | Temperature 19° C, Humidity 56 |
| Ranking | time | | L | Rk | React. | bib | | 1. TJ Holmes | USA | 49.12s | | 6 | 7. | 0.187 | 1405 | | 2. Kariem Hussein | SUI | 49.13s | | 2 | 8. | 0.147 | 1298 | | 3. Jaheel Hyde | JAM | 49.75s | | 7 | 12. | 0.157 | 1087 | | 4. Jack Green |  GBR | 49.927s | | 3 | 13. | 0.230 | 959 | | 5. Takatoshi Abe |  JPN | 49.929s | | 4 | 14. | 0.212 | 1101 | | 6. Mamadou Kasse Hann | FRA | 50.35s | | 5 | 17. | 0.165 | 928 | | 7. Aron Kipchumba Koech |  KEN | 50.40s | | 9 | 18. | 0.174 | 1137 | | 8. Jaak-Heinrich Jagor |  EST | 50.43s | | 8 | 19. | 0.149 | 882 |
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| | | Temperature 19° C, Humidity 56 |
| Ranking | time | | L | Rk | React. | bib | | 1. Abderrahaman Samba | QAT | 48.75s | | 6 | 5. | 0.247 | 1268 | | 2. Yasmani Copello | TUR | 48.91s | | 4 | 6. | 0.203 | 1345 | | 3. Eric Futch | USA | 49.30s | | 2 | 9. | 0.150 | 1394 | | 4. Ludvy Vaillant | FRA | 49.95s | | 5 | 15. | 0.205 | 942 | | 5. José Reynaldo Bencosme de Leon |  ITA | 50.29s | | 8 | 16. | 0.186 | 1060 | | 6. Ricardo Cunningham | JAM | 50.54s | | 3 | 20. | 0.216 | 1079 | | -. Guillermo Ruggeri |  ARG | DQ | | 7 | | 0.198 | 628 | | -. Marcio Teles |  BRA | DNF | | 9 | | 0.175 | 731 |
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| Record | Athlete | mark | venue | date | | World Record | Kevin Young (USA) | 46.78s | Barcelona, Spain | 6 August 1992 | | Championship Record | Kevin Young (USA) | 47.18s | Stuttgart, Germany | 19 August 1993 | | World Leading | Bershawn Jackson (USA) | 48.09s | Doha, Qatar | 15 May 2015 | | African Record | Samuel Matete (ZAM) | 47.10s | Zürich, Switzerland | 7 August 1991 | | Asian Record | Hadi Soua'an Al-Somaily (KSA) | 47.53s | Sydney, Australia | 27 September 2000 | | NorCeCa Record | Kevin Young (USA) | 46.78s | Barcelona, Spain | 6 August 1992 | | South American Record | Bayano Kamani (PAN) | 47.84s | Helsinki, Finland | 7 August 2005 | | European Record | Stéphane Diagana (FRA) | 47.37s | Lausanne, Switzerland | 5 July 1995 | | Oceanian Record | Rohan Robinson (AUS) | 48.28s | Atlanta, GA, United States | 31 July 1996 |
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| | | Event Target Number: 42 Athletes. 28 Countries. |
| Athlete | 2017 | best | birth | start | | -. Kyron McMaster |  IVB | 47.80s | 47.80s | 3 Jan 97 | Ht - -. | | -. Kerron Clement | USA | 48.02s | 47.24s | 31 Oct 85 | Ht - -. | | -. Eric Futch | USA | 48.18s | 48.18s | 25 Apr 93 | Ht - -. | | -. Yasmani Copello | TUR | 48.24s | 47.92s | 15 Apr 87 | Ht - -. | | -. Karsten Warholm | NOR | 48.25s | 48.25s | 28 Feb 96 | Ht - -. | | -. Michael Stigler | USA | 48.26s | 48.26s | 4 May 92 | Ht - -. | | -. Abderrahaman Samba | QAT | 48.31s | 48.31s | 5 Sep 95 | Ht - -. | | -. Mamadou Kasse Hann | FRA | 48.40s | 48.40s | 10 Oct 86 | Ht - -. | | -. TJ Holmes | USA | 48.44s | 48.44s | 2 Jul 95 | Ht - -. | | -. Kemar Mowatt | JAM | 48.49s | 48.49s | 12 Mar 95 | Ht - -. | | -. Byron Robinson | USA | 48.50s | 48.50s | 10 May 95 | Ht - -. | | -. Jaheel Hyde | JAM | 48.52s | 48.52s | 2 Feb 97 | Ht - -. | | -. Javier Culson |  PUR | 48.76s | 47.72s | 25 Jul 84 | Ht - -. | | -. Jack Green | GBR | 48.77s | 48.60s | 6 Oct 91 | Ht - -. | | -. Kariem Hussein | SUI | 48.79s | 48.45s | 4 Jan 89 | Ht - -. | | -. Ricardo Cunningham | JAM | 48.83s | 48.83s | 3 Oct 80 | Ht - -. | | -. Juander Santos | DOM | 48.92s | 48.92s | 7 May 95 | Ht - -. | | -. Rasmus MÄgi | EST | 48.94s | 48.40s | 4 May 92 | Ht - -. | | -. Marcio Teles | BRA | 48.94s | 48.94s | 27 Jan 94 | Ht - -. | | -. Takatoshi Abe | JPN | 48.94s | 48.94s | 12 Nov 91 | Ht - -. | | -. Thomas Barr | IRL | 48.95s | 47.97s | 24 Jul 92 | Ht - -. | | -. Abdelmalik Lahoulou | ALG | 49.05s | 48.62s | 7 May 92 | Ht - -. | | -. Hederson Estefani | BRA | 49.13s | 49.13s | 11 Sep 91 | Ht - -. | | -. Patryk Dobek | POL | 49.15s | 48.40s | 13 Feb 94 | Ht - -. | | -. Andre Clarke | JAM | 49.19s | 49.19s | 6 Jun 92 | Ht - -. | | -. José Reynaldo Bencosme De Leon | ITA | 49.22s | 49.22s | 16 May 92 | Ht - -. | | -. Victor Coroller | FRA | 49.30s | 49.30s | 29 Jan 97 | Ht - -. | | -. Ludvy Vaillant | FRA | 49.31s | 49.31s | 15 Mar 95 | Ht - -. | | -. Ryo Kajiki | JPN | 49.33s | 49.33s | 8 Dec 95 | Ht - -. | | -. Sergio FernÁndez |  ESP | 49.34s | 48.87s | 1 Apr 93 | Ht - -. | | -. José Luis Gaspar |  CUB | 49.35s | 49.17s | 25 Aug 95 | Ht - -. | | -. Yusuke Ishida | JPN | 49.35s | 49.35s | 25 May 95 | Ht - -. | | -. Lorenzo Vergani | ITA | 49.36s | 49.36s | 4 Sep 93 | Ht - -. | | -. Jaak-Heinrich Jagor | EST | 49.38s | 49.37s | 11 May 90 | Ht - -. | | -. Haron Koech | KEN | 49.39s | 48.49s | 27 Jan 90 | Ht - -. | | -. Jordin Andrade |  CPV | 49.52s | 49.24s | 5 May 92 | Ht - -. | | -. Eric Cray |  PHI | 49.57s | 48.98s | 6 Nov 88 | Ht - -. | | -. Guillermo Ruggeri | ARG | 49.72s | 49.72s | 26 Mar 92 | Ht - -. | | -. Creve Armando Machava |  MOZ | 50.73s | 50.54s | 8 Feb 96 | Ht - -. | | -. Mehboob Ali |  PAK | 51.15s | 51.15s | 10 Apr 90 | Ht - -. | | -. Pablo Andrés IbÁÑez |  ESA | 51.29s | 51.29 | 28 Oct 98 | Ht - -. | | -. Ephraim Lerkin |  PNG | 51.56s | 51.56 | 27 Nov 97 | Ht - -. |
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