| Final 18:20 | time | L | | 1. Michael Johnson |  USA | 43.39s | 5 | | 2. Harry Reynolds | USA | 44.22s | 6 | | 3. Gregory Haughton |  JAM | 44.56s | 3 | | 4. Samson Kitur |  KEN | 44.71s | 7 | | 5. Mark Richardson |  GBR | 44.81s | 8 | | 6. Darnell Hall | USA | 44.83s | 1 | | 7. Roger Black | GBR | 45.28s | 2 | | 8. Sunday Bada |  NGR | 45.50s | 4 |
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| Heat 1 17.40h | time | L | | 1. Michael Johnson | USA | 44.91s | 5 | | 2. Sunday Bada | NGR | 45.03s | 4 | | 3. Darnell Hall | USA | 45.07s | 6 | | 4. Roger Black | GBR | 45.32s | 2 | | 5. Abednego Matilu | KEN | 45.41s | 3 | | 6. Davian Clarke | JAM | 45.58s | 7 | | 7. Matthias Rusterholz |  SUI | 45.80s | 8 | | 8. Davis Kamoga |  UGA | 45.92s | 1 |
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| Heat 2 17.45h | time | L | | 1. Gregory Haughton | JAM | 44.70s | 6 | | 2. Harry Reynolds | USA | 45.10s | 4 | | 3. Samson Kitur | KEN | 45.27s | 5 | | 4. Mark Richardson | GBR | 45.42s | 3 | | 5. Jude Monye | NGR | 45.95s | 1 | | 6. Danny McFarlane | JAM | 45.98s | 8 | | 7. Norberto Tellez |  CUB | 46.68s | 2 | | -. Ibrahim Ismail |  QAT | DNS | 7 |
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| Heat 1 18.25h | time | L | | 1. Harry Reynolds | USA | 44.63s | 6 | | 2. Abednego Matilu | KEN | 44.97s | 5 | | 3. Roger Black | GBR | 45.01s | 3 | | 4. Jude Monye | NGR | 45.16s | 2 | | 5. Francis Ogola | UGA | 45.64s | 4 | | 6. Troy McIntosh |  BAH | 45.72s | 8 | | 7. Arnaud Malherbe |  RSA | 46.12s | 7 | | 8. Hachim Ndiaye |  SEN | 46.96s | 1 |
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| Heat 2 18.30h | Team | Time | L | | 1. Darnell Hall | USA | 45.09s | 6 | | 2. Gregory Haughton | JAM | 45.12s | 3 | | 3. Ibrahim Ismail | QAT | 45.31s | 5 | | 4. Davis Kamoga | UGA | 45.50s | 4 | | 5. Justino Inaldo Sena |  BRA | 4....s | 8 | | 6. JorgeL. Crusellas | CUB | 46.09s | 2 | | 7. Adrian Patrick | GBR | 46.27s | 7 | | 8. Eswort Coombs |  STV | 47.15s | 1 |
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| Heat 3 18.35h | time | L | | 1. Samson Kitur | KEN | 45.25s | 6 | | 2. Mark Richardson | GBR | 45.30s | 3 | | 3. Matthias Rusterholz | SUI | 45.54s | 4 | | 4. Danny McFarlane | JAM | 45.79s | 8 | | 5. Andrea Nuti |  ITA | 45.89s | 5 | | 6. Pierre-Marie Hilaire |  FRA | 46.01s | 7 | | 7. Ju-Il Shon |  KOR | 46.31s | 2 | | 8. Paul Greene |  AUS | 46.36s | 1 |
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| Heat 4 18.40h | time | L | | 1. Michael Johnson | USA | 45.15s | 5 | | 2. Sunday Bada | NGR | 45.29s | 3 | | 3. Norberto Tellez | CUB | 45.68s | 4 | | 4. Davian Clarke | JAM | 45.69s | 1 | | 5. Bobang Phiri | RSA | 45.94s | 8 | | 6. Kennedy Ochieng | KEN | 46.15s | 6 | | 7. Michael Joubert | AUS | 46.61s | 2 | | 8. Amar Hacini |  ALG | 46.64s | 7 |
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| Heat 1 10.10h | time | L | | 1. Roger Black | GBR | 45.81s | 8 | | 2. Kennedy Ochieng | KEN | 45.87s | 5 | | 3. Arnaud Malherbe | RSA | 46.09s | 2 | | 4. Amar Hacini | ALG | 46.29s | 4 | | 5. Udeme Ekpeyong | NGR | 46.41s | 1 | | 6. Ahmed Ali |  GHA | 46.75s | 7 | | 7. Kenmore Hughes |  ANT | 47.26s | 6 | | 8. Medard Makanga |  CGO | 47.38s | 3 |
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| Heat 2 10.15h | time | L | | 1. Ibrahim Ismail | QAT | 45.10s | 8 | | 2. Davis Kamoga | UGA | 45.34s | 5 | | 3. Darnell Hall | USA | 45.34s | 2 | | 4. Bobang Phiri | RSA | 45.94s | 6 | | 5. Paul Greene | AUS | 46.25s | 4 | | 6. Desire Pierre-Louis |  MRI | 46.73s | 7 | | 7. Evripides Demosthenous |  CYP | 46.84s | 3 |
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| Heat 3 10.20h | time | L | | 1. Mark Richardson | GBR | 45.61s | 6 | | 2. Gregory Haughton | JAM | 45.62s | 7 | | 3. Francis Ogola | UGA | 45.70s | 8 | | 4. Eswort Coombs | STV | 46.06s | 2 | | 5. Hachim Ndiaye | SEN | 46.31s | 3 | | 6. Maxime Charlemagne |  STL | 48.21s | 1 | | -. Arnold Payne |  ZIM | DQ | 5 | | -. Sebastian Keitel |  CHI | DNS | 4 |
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| Heat 4 10.25h | time | L | | 1. Michael Johnson | USA | 45.49s | 5 | | 2. Abednego Matilu | KEN | 45.80s | 6 | | 3. Davian Clarke | JAM | 45.92s | 4 | | 4. Adrian Patrick | GBR | 46.11s | 8 | | 5. Pablo Escriba |  ESP | 46.85s | 7 | | 6. Omar Mena | CUB | 47.53s | 2 | | -. Stephen Lugor |  SUD | DQ | 3 |
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| Heat 5 10.30h | time | L | | 1. Harry Reynolds | USA | 45.60s | 8 | | 2. Matthias Rusterholz | SUI | 45.97s | 4 | | 3. Pierre-Marie Hilaire | FRA | 46.13s | 7 | | 4. Jude Monye | NGR | 46.25s | 2 | | 5. JorgeL. Crusellas | CUB | 46.32s | 3 | | 6. Mohammed Al-Bishi |  KSA | 46.76s | 6 | | 7. Richard Jones |  GUY | 47.36s | 5 |
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| Heat 6 10.35h | time | L | | 1. Samson Kitur | KEN | 45.63s | 8 | | 2. Norberto Tellez | CUB | 45.72s | 3 | | 3. InaldoJustino Sena | BRA | 45.75s | 4 | | 4. Troy McIntosh | BAH | 45.87s | 2 | | 5. Michael Joubert | AUS | 46.31s | 6 | | 6. Justice Dipeba |  BOT | 46.57s | 7 | | 7. Raymundo Escalante |  MEX | 48.29s | 5 |
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| Heat 7 10.40h | time | L | | 1. Sunday Bada | NGR | 46.08s | 8 | | 2. Andrea Nuti | ITA | 46.25s | 5 | | 3. Danny McFarlane | JAM | 46.27s | 6 | | 4. Ju-Il Shon | KOR | 46.41s | 3 | | 5. Sanderlei Claro Parrela | BRA | 46.59s | 4 | | 6. Hayden Stephens |  TRI | 47.64s | 1 | | 7. Salomone Bole |  FIJ | 47.92s | 7 | | -. Alvaro James |  CRC | DQ | 2 |
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