Heat 7 | | time | | gap | L | ag | Rk | 3. Pablo Morales | United States | 54.01s | | +0.41s | - | 21 | 1. | 9. Aleksey Markovsky | Soviet Union | 55.15s | | +1.55s | - | 29 | 2. | 22.Wojciech Wyzga | Poland | 56.24s | | +2.64s | - | 20 | 3. | 23.Bruno Gutzeit | France | 56.25s | | +2.65s | - | 20 | 4. | 30.Hiroshi Miura | Japan | 57.01s | | +3.41s | - | 20 | 5. | 31.Jose Umana | Venezuela | 57.06s | | +3.46s | - | | 6. | 42.Ricardo Jimenez | Venezuela | 58.06s | | +4.46s | - | | 7. | 45.Mohamed Youssef | Egypt | 59.75s | | +6.15s | - | 23 | 8. |
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Heat 6 | | time | | gap | L | ag | Rk | 1. Matt Biondi | United States | 53.60s | CR | | - | 20 | 1. | 7. Benny Nielsen | Denmark | 54.98s | | +1.38s | - | 20 | 2. | 13.Dano Halsall | Switzerland | 55.45s | | +1.85s | - | 23 | 3. | 16.Frank Drost | Netherlands | 55.71s | | +2.11s | - | 23 | 4. | 25.Jose Luis Ballester | Spain | 56.39s | | +2.79s | - | 17 | 5. | 35.Zhaoying Luo | China | 57.47s | | +3.87s | - | | 6. | 36.Raul Camargo Viana | Brazil | 57.50s | | +3.90s | - | | 7. | 47.Juan Cabrera | Dominicana | 1:00.43 | | +6.83s | - | | 8. |
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