| Final | time | age | | 1. Alberto Juantorena | CUB | 1:43.50 | 25 | | 2. Ivo Van Damme | BEL | 1:43.86 | 22 | | 3. Rick Wohlhunter | USA | 1:44.12 | 27 | | 4. Willi Wulbeck | FRG | 1:45.26 | 21 | | 5. Steve Ovett | GBR | 1:45.44 | 20 | | 6. Luciano Susanj | YUG | 1:45.75 | 27 | | 7. Sri Ram Singh | IND | 1:45.77 | 26 | | 8. Carlo Grippo | ITA | 1:48.39 | 21 |
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| Semi 1 | time | | 1. Alberto Juantorena | CUB | 1:45.88 | | 2. Ivo Vandamme | BEL | 1:46.00 | | 3. Steven O'Vett | GBR | 1:46.14 | | 4. Sriram Singh | IND | 1:46.42 | | 5. James Robinson | USA | 1:46.43 | | 6. Marian Gesicki | POL | 1:47.06 | | 7 Thomas Wessinghage | FRG | 1:48.18 | | -.Horace Tuitt | TRI | DNF |
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| Semi 2 | time | | 1. Richard Wohlhuter | USA | 1:46.72 | | 2. Carlo Grippo | ITA | 1:46.95 | | 3. Lucijano Susanj | YUG | 1:47.03 | | 4. Willi Wuelbeck | FRG | 1:47.18 | | 5. Seymour Newman | JAM | 1:47.22 | | 6. Leandro Civil | CUB | 1:47.31 | | 7. Victor Anohin | URS | 1:47.71 | | 8. Frank Clement | GBR | 1:48.28 |
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| Heat 1 | time | | 1. Richard Wohlhuter | USA | 1:45.71 | | 2. Sriram Singh | IND | 1:45.86 | | 3. Leandro Civil | CUB | 1:45.88 | | 4. Marian Gesicki | POL | 1:46.36 | | 5. Thomas Wessinghage | FRG | 1:46.56 | | 6. Victor Anohin | URS | 1:46.81 | | 7. Muhammad Younis | PAK | 1:48.50 |
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| Heat 2 | time | | 1. Frank Clement | GBR | 1:47.51 | | 2. James Robinson | USA | 1:47.56 | | 3. John Walker | NZL | 1:47.63 | | 4. Andres Ballbe | ESP | 1:48.38 | | 5. Fern. Pacheco Mamede | POR | 1:49.58 | | 6. Francisco Solis | DOM | 1:55.56 | | 7. Wilnor Joseph | HAI | 2:15:26 |
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| Heat 3 | time | | 1. Steven O'Vett | GBR | 1:48.27 | | 2. Seymour Newman | JAM | 1:48.46 | | 3. Paul-H Wellmann | FRG | 1:48.47 | | 4. Josef Plachy | TCH | 1:48.63 | | 5. Gunther Hasler | LIE | 1:48.83 | | 6. Evert Hoving | HOL | 1:48.99 | | 7. Roy Botse | SUR | 1:49.85 |
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| Heat 4 | time | | 1. Alberto Juantorena | CUB | 1:47.15 | | 2. Carlo Grippo | ITA | 1:47.21 | | 3. Janos Zemen | HUN | 1:47.40 | | 4. Milovan Savic | YUG | 1:47.73 | | 5. Jorge Ortiz | PUR | 1:51.38 | | -.Roqui Sanchez | FRA | DSQ | | -.Markku Taskinen | FIN | DNS |
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| Heat 5 | time | | 1. Willi Wuelbeck | FRG | 1:48.47 | | 2. Horace Tuitt | TRI | 1:48.48 | | 3. Vladimir Ponomarev | URS | 1:48.59 | | 4. Ake Svensson | SWE | 1:48.86 | | 5. Jose Marajo | FRA | 1:49.60 | | 6. Orlando Greene | BAR | 1:51.43 | | 7. Ateyah El Khashaami | KSA | 1:57.67 |
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| Heat 6 | time | | 1. Ivo Vandamme | BEL | 1:47.80 | | 2. Lucijano Susanj | YUG | 1:47.82 | | 3. Mark Enyeart | USA | 1:47.96 | | 4. Rolf Gysin | SUI | 1:48.69 | | 5. Niall O'Shaughnessy | IRL | 1:49.29 | | 6. Luis Medina | CUB | 1:50.15 | | 7. Marcel Philippe | FRA | 1:50.81 |
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