| Men 100m Freestyle I Swimming World Championship 1973 Beograd, Yugoslavia - Sunday, 9th September - Gold Medal: Jim Montgomery, United States      | 
| Final |   | time |   | gap | L | pts | ag |  | 1. Jim Montgomery |   United States | 51.708s | CR |   | 4 | 778 | 18 |  | 2. Michel Rousseau |   France | 52.086s |   | +0.38s | 2 | 762 | 24 |  | 3. Mike Wenden |   Australia | 52.222s |   | +0.52s | 5 | 755 | 23 |  | 4. Vladimir Bure |   Soviet Union | 52.522s |   | +0.82s | 3 | 743 | 22 |  | 5. John Murphy |   United States | 52.732s |   | +1.03s | 7 | 734 | 20 |  | 6. Klaus Steinbach |   West Germany | 52.820s |   | +1.12s | 6 | 730 | 19 |  | 7. Roger Pyttel |   East Germany | 53.253s |   | +1.55s | 1 | 712 | 16 |  | 8. Rui Oliveira |   Brazil | 53.701s |   | +2.00s | 8 | 695 | 20 |   
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| World Record: Mark Spitz, United States 51.22s OG Munchen, West Germany 3rd September 1972 |   
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 Heats - Sunday, 9th September |  | Best 8 times advanced to Final>.  |   
| Heat 6 |   | time |   | gap | L | ag | Rk  |  | 4. Klaus Steinbach |   West Germany | 52.986s |   | +0.32s | - | 19 | 1. |  | 5. Michel Rousseau |   France | 53.041s |   | +0.38s | - | 24 | 2. |  | 16.Mirek Hrouda |   Czechoslovakia | 54.240s |   | +1.58s | - | _ | 3. |  | 17.Neil Rogers |   Australia | 54.505s |   | +1.84s | - | 20 | 4. |  | 18.Igor Grivennikov |   Soviet Union | 54.584s |   | +1.92s | - | 21 | 5. |  | 22.Stefan Georgiev |   Bulgaria | 55.064s |   | +2.40s | - | 18 | 6. |   
| Heat 5 |   | time |   | gap | L | ag | Rk  |  | 3. Vladimir Bure |   Soviet Union | 52.771s |   | +0.11s | - | 22 | 1. |  | 9. Roberto Pangaro |   Italy | 53.877s |   | +1.21s | - | 23 | 2. |  | 10.Bruce Robertson |   Canada | 53.908s |   | +1.24s | - | 20 | 3. |  | 11.Peter Nocke |   West Germany | 53.939s |   | +1.27s | - | 17 | 4. |  | 30.Pierre-Yves Copin |   France | 56.278s |   | +3.61s | - | 22 | 5. |  | -. Marian Slavic |   Romania | DNS |   | - | - | 27 | -. |   
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| Heat 4 |   | time |   | gap | L | ag | Rk  |  | 6. John Murphy |   United States | 53.162s |   | +0.50s | - | 20 | 1. |  | 7. Roger Pyttel |   East Germany | 53.539s |   | +0.87s | - | 16 | 2. |  | 15.Jorge Comas Lopez |   Spain | 54.237s |   | +1.57s | - | 19 | 3. |  | 27.Istvan Szentirmay |   Hungary | 56.071s |   | +3.41s | - | 24 | 4. |  | 28.Lyudmil Stoev |   Bulgaria | 56.236s |   | +3.57s | - | _ | 5. |  | 29.Ali Gharbi |   Tunisia | 56.239s |   | +3.57s | - | 18 | 6. |  | -. Z. Opritescu |   Romania | DNS |   | - | - | _ | -. |   
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| Heat 3 |   | time |   | gap | L | ag | Rk  |  | 1. Jim Montgomery |   United States | 52.660s | CR |   | - | 18 | 1. |  | 12.Fritz Warncke |   Norway | 54.018s |   | +1.35s | - | 17 | 2. |  | 13.Peter Bruch |   East Germany | 54.120s |   | +1.46s | - | 17 | 3. |  | 19.Marcello Guarducci |   Italy | 54.631s |   | +1.97s | - | 17 | 4. |  | 25.Jovan Kovacic |   Yugoslavia | 55.735s |   | +3.07s | - | _ | 5. |  | 26.Gianni Versari |   Panama | 55.970s |   | +3.31s | - | 15 | 6. |  | 35.Carlos A Santiago Bermudez |   Puerto Rico | 57.699s |   | +5.03s | - | _ | 7. |   
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| Heat 2 |   | time |   | gap | L | ag | Rk  |  | 2. Mike Wenden |   Australia | 52.671s | CR | +0.01s | - | 23 | 1. |  | 14.Jose Roberto Diniz Aranha |   Brazil | 54.157s |   | +1.49s | - | 22 | 2. |  | 20.Bernt Zarnowiecki |   Sweden | 54.685s |   | +1.99s | - | 19 | 3. |  | 21.Goran Jansson |   Sweden | 54.836s |   | +2.17s | - | _ | 4. |  | 23.Rene Lustig |   Yugoslavia | 55.236s |   | +2.57s | - | _ | 5. |  | 32.Ramon Volcan |   Venezuela | 57.065s |   | +4.40s | - | 17 | 6. |  | 33.Jose Ferraioli |   Puerto Rico | 57.081s |   | +4.42s | - | 25 | 7. |   
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| Heat 1 |   | time |   | gap | L | ag | Rk  |  | 8. Rui Oliveira |   Brazil | 53.675s | CR | +1.01s | - | 20 | 1. |  | 24.Brian Phillips |   Canada | 55.708s |   | +3.04s | - | 19 | 2. |  | 31.Eduardo Orejuela |   Ecuador | 56.500s |   | +3.84s | - | 21 | 3. |  | 34.Ali Kinawi |   Egypt | 57.283s |   | +4.62s | - | _ | 4. |  | 36.Mehmet Dilmac |   Turkey | 58.514s |   | +5.85s | - | _ | 5. |   
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