| Men 400m Medley Swimming V World Championship 1986 Madrid, Spain - Monday, 18th August - Gold Medal: Tamas Darnyi, Hungary |
| Final | | time | | gap | L | ag | pts | | 1. Tamas Darnyi |  Hungary | 4:18.98 | CR | | 3 | 19 | 892 | | 2. Vadym Yaroshchuk |  Soviet Union | 4:22.03 | | +3.05s | 4 | 20 | 861 | | 3. Alex Baumann |  Canada | 4:22.58 | | +3.60s | 8 | 22 | 856 | | 4. Joszef Szabo | Hungary | 4:23.02 | | +4.04s | 5 | 17 | 851 | | 5. Patrick Kuhl |  East Germany | 4:24.82 | | +5.84s | 7 | 18 | 834 | | 6. Jeff Kostoff |  United States | 4:25.43 | | +6.45s | 2 | 20 | 828 | | 7. Ricardo Prado |  Brazil | 4:26.00 | | +7.02s | 1 | 21 | 823 | | 8. Peter Bermel |  West Germany | 4:26.46 | | +7.48s | 6 | 19 | 819 |
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| Final | | time | | gap | L | ag | | 9. Roberto Woodhouse |  Australia | 4:22.26 | | | 5 | 20 | | 10.Dave Wharton | United States | 4:23.95 | | +1.69s | 7 | 17 | | 11.Charalambos Papanikolaou |  Greece | 4:25.68 | | +3.42s | 4 | 17 | | 12.Maurizio Divano |  Italy | 4:26.76 | | +4.50s | 2 | 24 | | 13.Roberto Cassio | Italy | 4:27.89 | | +5.63s | 3 | 18 | | 14.Ricardo Valdivia |  Spain | 4:29.35 | | +7.09s | 8 | | | 15.Ralf Diegel | West Germany | 4:30.70 | | +8.44s | 7 | 22 | | 16.Raik Hannemann | East Germany | 4:35.84 | | +13.58s | 1 | 18 |
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Heats - Monday, 18th August |
| Best 8 times advanced to Final. Next 8 to Final B. |
| Heat 5 | | time | | gap | L | ag | Rk | | 3. Tamas Darnyi | Hungary | 4:24.98 | | +1.28s | - | 19 | 1. | | 6. Alex Baumann | Canada | 4:26.42 | | +2.72s | - | 22 | 2. | | 9. Charalambos Papanikolaou | Greece | 4:26.78 | | +3.08s | - | 17 | 3. | | 12.Ralf Diegel | West Germany | 4:26.88 | | +3.18s | - | 22 | 4. | | 20.Josef Hladky |  Czechoslovakia | 4:37.75 | | +14.05s | - | 24 | 5. | | 24.Julio Lopez | Brazil | 4:41.54 | | +17.84s | - | 19 | 6. | | 32.Darryl Smith |  Zimbabwe | 5:00.59 | | +36.89s | - | | 7. |
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| Heat 4 | | time | | gap | L | ag | Rk | | 7. Patrick Kuhl | East Germany | 4:26.39 | | +2.69s | - | 18 | 1. | | 14.Dave Wharton | United States | 4:27.13 | | +3.43s | - | 17 | 2. | | 16.Ricardo Valdivia | Spain | 4:29.21 | | +5.51s | - | | 3. | | 17.Steve Poulter |  Great Britain | 4:32.22 | | +8.52s | - | 25 | 4. | | 22.Jon Kelly | Canada | 4:38.92 | | +15.22s | - | 20 | 5. | | 28.Gokhan Attaroglu |  Turkey | 4:47.98 | | +24.28s | - | 21 | 6. | | 29.Manuel Gutierrez |  Panama | 4:49.19 | | +25.49s | - | 21 | 7. |
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| Heat 3 | | time | | gap | L | ag | Rk | | 1. Vadym Yaroshchuk | Soviet Union | 4:23.70 | | | - | 20 | 1. | | 4. Peter Bermel | West Germany | 4:25.51 | | +1.81s | - | 19 | 2. | | 10.Robert Woodhouse | Australia | 4:26.82 | | +3.12s | - | 20 | 3. | | 18.Christophe Bordeau |  France | 4:34.66 | | +10.96s | - | 18 | 4. | | 23.Jorge Marti | Spain | 4:40.23 | | +16.53s | - | | 5. | | 25.Pavel Bello |  Cuba | 4:45.03 | | +21.33s | - | | 6. | | 34.Juan Cabrera |  Dominicana | 5:04.21 | | +40.51s | - | | 7. |
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| Heat 2 | | time | | gap | L | ag | Rk | | 8. Ricardo Prado | Brazil | 4:26.71 | | +3.01s | - | 21 | 1. | | 11.Roberto Cassio | Italy | 4:26.83 | | +3.13s | - | 18 | 2. | | 15.Raik Hannemann | East Germany | 4:27.98 | | +4.28s | - | 18 | 3. | | 21.Rui Borges |  Portugal | 4:38.07 | | +14.37s | - | 19 | 4. | | 26.Janne Soininen |  Finland | 4:46.01 | | +22.31s | - | | 5. | | 33.Shih-Hung Lee |  Chinese Taipei | 5:03.56 | | +39.86s | - | | 6.? | | -. Gary Binfield | Great Britain | DSQ | | | - | 20 | |
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| Heat 1 | | time | | gap | L | ag | Rk | | 2. Joszef Szabo | Hungary | 4:24.88 | | +1.18s | - | 17 | 1. | | 5. Jeff Kostoff | United States | 4:26.11 | | +2.41s | - | 20 | 2. | | 13.Maurizio Divano | Italy | 4:27.09 | | +3.39s | - | 24 | 3. | | 19.Anders Peterson |  Sweden | 4:35.21 | | +11.51s | - | 21 | 4. | | 27.Brent Foster |  New Zealand | 4:47.73 | | +24.03s | - | | 5. | | 30.Alejandro Lecot |  Argentina | 4:51.09 | | +27.39s | - | 23 | 6. | | 31.Samir Bouchlaghem |  Tunisia | 4:58.97 | | +35.27s | - | | 7. |
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