| Final 21:50 | time |   | L | React. | bib |  | 1. LaShawn Merritt |   USA |  43.74s | WL | 6. | 0.256 | 1150 |  | 2. Tony McQuay |   USA |  44.40s | PB | 4. | 0.155 | 1148 |  | 3. Luguelín Santos |   DOM |  44.52s | SB | 7. | 0.350 | 349 |  | 4. Jonathan Borlée |   BEL |  44.54s | SB | 8. | 0.224 | 176 |  | 5. Pavel Maslák |   CZE |  44.91s |   | 1. | 0.169 | 330 |  | 6. Yousef Ahmed Masrahi |   KSA |  44.97s |   | 3. | 0.162 | 744 |  | 7. Kirani James |   GRN |  44.99s |   | 5. | 0.186 | 560 |  | 8. Anderson Henriques |   BRA |  45.03s |   | 2. | 0.157 | 210 |   
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 | Standard A | 45.28s |  | Standard B | 45.60s |   
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 Semi-Finals - Monday 12.08 - First 2 and Best 2 progress. |   
|  Semi 1.20:05 | time |   | L | Rk. | React. | bib |  | 1. Yousef Ahmed Masrahi |   KSA |  44.61s | NR | 8 | 2. | 0.158 | 744 |  | 2. Tony McQuay |   USA |  44.66s | SB | 3 | 3. | 0.144 | 1148 |  | 3. Anderson Henriques |   BRA |  44.95s |   | 5 | 8. | 0.167 | 210 |  | 4. Kévin Borlée |   BEL |  45.03s |   | 4 | 9. | 0.179 | 175 |  | 5. Javon Francis |   JAM |  45.62s |   | 6 | 15. | 0.175 | 642 |  | 6. Nick Ekelund-Arenander |   DEN |  45.89s |   | 7 | 18. | 0.180 | 341 |  | 7. Brian Gregan |   IRL |  45.98s |   | 2 | 21. | 0.208 | 597 |  | 8. Yuzo Kanemaru |   JPN |  46.28s |   | 1 | 23. | 0.154 | 666 |   
|  Semi 2.20:30 | time |   | L | Rk. | React. | bib |  | 1. LaShawn Merritt |   USA |  44.60s |   | 6 | 1. | 0.246 | 1150 |  | 2. Jonathan Borlée |   BEL |  44.85s | SB | 3 | 7. | 0.165 | 176 |  | 3. Chris Brown |   BAH |  45.18s | SB | 8 | 10. | 0.216 | 151 |  | 4. Deon Lendore |   TRI |  45.47s |   | 4 | 12. | 0.190 | 1054 |  | 5. Matteo Galvan |   ITA |  45.69s |   | 5 | 16. | 0.177 | 612 |  | 6. Omar Johnson |   JAM |  45.89s |   | 1 | 18. | 0.192 | 647 |  | 7. Gustavo Cuesta |   DOM |  45.93s |   | 2 | 20. | 0.177 | 345 |  | 8. José Meléndez |   VEN |  46.22s |   | 7 | 22. | 0.213 | 1198 |   
|  Semi 3.20:21 | time |   | L | Rk. | React. | bib |  | 1. Kirani James |   GRN |  44.81s |   | 4 | 4. | 0.161 | 560 |  | 2. Luguelín Santos |   DOM |  44.83s |   | 6 | 5. | 0.174 | 349 |  | 3. Pavel Maslák |   CZE |  44.84s | NR | 7 | 6. | 0.167 | 330 |  | 4. Jarrin Solomon |   TRI |  45.43s |   | 5 | 11. | 0.158 | 1055 |  | 5. Arman Hall |   USA |  45.54s |   | 2 | 13. | 0.158 | 1129 |  | 6. Nigel Levine |   GBR |  45.60s |   | 8 | 14. | 0.176 | 488 |  | 7. Javere Bell |   JAM |  45.77s |   | 3 | 17. | 0.205 | 637 |  | 8. Nery Brenes |   CRC |  46.34s |   | 1 | 24. | 0.172 | 306 |   
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 Heats - Sunday 11.08 - First 4 and Best 4 progress. |   
|  Heat 1.11:05 | time |   | L | Rk. | React. | bib |  | 1. Tony McQuay |   USA |  45.06s |   | 4 | 3. | 0.162 | 1148 |  | 2. Jonathan Borlée |   BEL |  45.24s |   | 2 | 9. | 0.191 | 176 |  | 3. Nick Ekelund-Apenander |   DEN |  45.81s |   | 3 | 18. | 0.162 | 641 |  | 4. Nery Brenes |   CRC |  46.16s |   | 5 | 23. | 0.193 | 306 |  | 5. Ramon Miller |   BAH |  47.53s |   | 6 | 29. | 0.251 | 153 |  | -. Yoandys Lescay |   CUB | DQ |   | 7 |   | 0.191 | 314 |  | -. Thet Zaw Win |   MYA | DQ |   | 8 |   | 0.189 | 808 |   
|  Heat 2.11:13 | time |   | L | Rk. | React. | bib |  | 1. Anderson Henriques |   BRA |  45.13s | PB | 5 | 4. | 0.164 | 210 |  | 2. Javon Francis |   JAM |  45.37s |   | 7 | 11. | 0.166 | 642 |  | 3. Matteo Galvan |   ITA |  45.39s | PB | 6 | 12. | 0.164 | 612 |  | 4. Yousef Ahmed Masrahi |   KSA |  45.39s |   | 2 | 13. | 0.158 | 744 |  | 5. Arman Hall |   USA |  45.45s |   | 3 | 17. | 0.154 | 1129 |  | 6. Brian Gregan |   IRL |  46.04s |   | 4 | 22. | 0.202 | 597 |  | 7. Hamdinou Cheikh El Wely |   MTN |  52.33s | PB | 8 | 32. | 0.222 | 807 |   
|  Heat 3.11:21 | time |   | L | Rk. | React. | bib |  | 1. LaShawn Merritt |   USA |  44.92s |   | 6 | 1. | 0.190 | 1150 |  | 2. Deon Lendore |   TRI |  45.17s |   | 8 | 5. | 0.228 | 1054 |  | 3. Pavel Maslák |   CZE |  45.44s |   | 3 | 16. | 0.164 | 330 |  | 4. José Meléndez |   VEN |  45.82s | PB | 5 | 19. | 0.226 | 1198 |  | 5. Vladimir Krasnov |   RUS |  46.23s |   | 7 | 25. | 0.228 | 943 |  | 6. LaToy Williams |   BAH |  46.65s |   | 4 | 27. | 0.173 | 154 |  | 7. Ak. Hafiy Tajuddin Rositi |   BRU |  49.98s |   | 2 | 31. | 0.258 | 231 |   
|  Heat 4.11:29 | time |   | L | Rk. | React. | bib |  | 1. Luguelín Santos |   DOM |  45.23s |   | 8 | 8. | 0.189 | 349 |  | 2. Kévin Borlée |   BEL |  45.32s |   | 7 | 10. | 0.143 | 175 |  | 3. Chris Brown |   BAH |  45.39s |   | 5 | 12. | 0.184 | 151 |  | 4. Nigel Levine |   GBR |  45.41s |   | 2 | 15. | 0.183 | 488 |  | 5. Omar Johnson |   JAM |  45.97s |   | 3 | 21. | 0.176 | 647 |  | 6. Yuzo Kanemaru |   JPN |  46.18s |   | 4 | 24. | 0.159 | 666 |  | -. Daniel Aleman |   NCA | DQ |   | 6 |   | 0.158 | 810 |   
|  Heat 5.11:37 | time |   | L | Rk. | React. | bib |  | 1. Kirani James |   GRN |  45.00s |   | 7 | 2. | 0.148 | 560 |  | 2. Jarrin Solomon |   TRI |  45.19s | PB | 8 | 6. | 0.173 | 1055 |  | 3. Javere Bell |   JAM |  45.20s |   | L | 7. | 0.245 | 637 |  | 4. Gustavo Cuesta |   DOM |  45.93s |   | 3 | 20. | 0.187 | 345 |  | 5. Wayde van Niekerk |   RSA |  46.37s |   | 4 | 26. | 0.181 | 925 |  | 6. Kevin Moore |   MLT |  47.52s |   | 5 | 28. | 0.198 | 801 |  | 7. Angelo Garland |   TKS |  48.65s |   | 6 | 30. | 0.193 | 1040 |   
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| Start List | 2013 | Pers.Best | Heat | L | bib |  | 1. LaShawn Merritt |  USA | 44.09 | 43.75 | Heat 3. | 6. | 1150 |  | 7. Kirani James |  GRN | 43.96 | 43.94 | Heat 5. | 7. | 560 |  | -. Chris Brown |  BAH | 45.24 | 44.40 | Heat 4. | 5. | 151 |  | 4. Jonathan Borlée |  BEL | 45.14 | 44.43 | Heat 1. | 2. | 176 |  | 3. Luguelín Santos |  DOM | 44.74 | 44.45 | Heat 4. | 8. | 349 |  | 2. Tony McQuay |  USA | 44.72 | 44.49 | Heat 1. | 4. | 1148 |  | -. Kévin Borlée |  BEL | 44.73 | 44.56 | Heat 4. | 7. | 175 |  | -. Nery Brenes |  CRC | 46.03 | 44.65 | Heat 1. | 5. | 306 |  | 6. Yousef Ahmed Masrahi |  KSA | 44.72 | 44.72 | Heat 2. | 2. | 744 |  | -. LaToy Williams |  BAH | 45.26 | 44.73 | Heat 3. | 4. | 154 |  | -. Arman Hall |  USA | 44.82 | 44.82 | Heat 2. | 3. | 1129 |  | -. Ramon Miller |  BAH | 44.93 | 44.87 | Heat 1. | 6. | 153 |  | 5. Pavel Maslák |  CZE | 45.13 | 44.91 | Heat 3. | 3. | 330 |  | -. Deon Lendore |  TRI | 44.94 | 44.94 | Heat 3. | 8. | 1054 |  | -. Javere Bell |  JAM | 45.08 | 45.08 | Heat 5. | 8. | 637 |  | -. Wayde van Niekerk |  RSA | 45.09 | 45.09 | Heat 5. | 4. | 925 |  | -. Nigel Levine |  GBR | 45.23 | 45.11 | Heat 4. | 2. | 488 |  | -. Vladimir Krasnov |  RUS | 45.49 | 45.12 | Heat 3. | 7. | 943 |  | 8. Anderson Henriques |  BRA | 45.16 | 45.16 | Heat 2. | 5. | 210 |  | -. Yuzo Kanemaru |  JPN | 45.56 | 45.16 | Heat 4. | 4. | 666 |  | -. Javon Francis |  JAM | 45.24 | 45.24 | Heat 2. | 7. | 642 |  | -. Yoandys Lescay |  CUB | 45.29 | 45.29 | Heat 1. | 7. | 314 |  | -. Jarrin Solomon |  TRI | 45.34 | 45.31 | Heat 5. | 2. | 1055 |  | -. Gustavo Cuesta |  DOM | 45.45 | 45.45 | Heat 5. | 3. | 345 |  | -. Nick Ekelund-Arenander |  DEN | 45.50 | 45.50 | Heat 1. | 3. | 341 |  | -. Omar Johnson |  JAM | 45.50 | 45.50 | Heat 4. | 3. | 647 |  | -. Brian Gregan |  IRL | 45.53 | 45.53 | Heat 2. | 4. | 597 |  | -. Matteo Galvan |  ITA | 45.59 | 45.59 | Heat 2. | 6. | 612 |  | -. José Meléndez |  VEN | 46.08 | 46.08 | Heat 3. | 5. | 1198 |  | -. Kevin Moore |  MLT | 47.26 | 46.13 | Heat 5. | 5. | 801 |  | -. Angelo Garland |  TKS | 48.14 | 48.14 | Heat 5. | 6. | 1040 |  | -. Ak. Hafiy Tajuddin Rositi |  BRU | 49.42 | 48.67 | Heat 3. | 2. | 231 |  | -. Thet Zaw Win |  MYA |   | 49.00 | Heat 1. | 8. | 808 |  | -. Hamdinou Cheikh El Wely |  MTN |   |   | Heat 2. | 8. | 807 |  | -. Daniel Aleman |  NCA |   |   | Heat 4. | 6. | 810 |   
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