| Men 100m Butterfly Swimming III World Championship 1978 West Berlin - Saturday, 26th August - Gold Medal: Gold Medal: Joe Bottom | 
| Final |   | time |   | gap | L | ag | 50m |  | 1. Joe Bottom |   United States | 54.30s |   |   | - | 23 | 25.50s |  | 2. Greg Jagenburg |   United States | 55.26s |   | +0.96s | - | 22 | 26.00s |  | 3. Par Arvidsson |   Sweden | 55.38s |   | +1.08s | - | 18 | 26.07s  |  | 4. Roger Pyttel |   East Germany | 55.40s |   | +1.10s | - | 21 | 26.11s  |  | 5. Dan Thompson |   Canada | 56.43s |   | +2.13s | - | 22 | 25.74s |  | 6. Klaus Steinbach |   West Germany | 55.90s | NR | +1.60s | - | 24 | 26.09s  |  | 7. Miloslav Rolko |   Czechoslovakia | 55.96s |   | +1.66s | - | 17 | 26.22s  |  | 8. Kees Vervoorn |   Netherlands | 56.27s |   | +1.97s | - | 18 | 26.31s  |   
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| World Record: Joe Bottom, United States 54.18s (25.55s) |  | Championship Record: Greg Jagenburg, United States 55.63s (26.24s) |   
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 Heats - Saturday, 26th August |  | Best 8 times advanced to Final>.  |   
| Heat 6 |   | time |   | gap | L | ag | Rk |  | 1. Joe Bottom |   United States | 54.21s | WR |   | - | 23 | 1. |  | 10.Michael Kraus |   West Germany | 56.50s |   | +2.29s | - | 22 | 2. |  | 14.Philip Hubble |   Great Britain | 57.31s |   | +3.10s | - | 18 | 3. |   
| Heat 5 |   | time |   | gap | L | ag | Rk |  | 4. Roger Pyttel |   East Germany | 55.71s |   | +1.50s | - | 21 | 1. |  | 5. Miloslav Rolko |   Czechoslovakia | 55.89s | NR | +1.68s | - | 17 | 2. |  | 6. Kees Vervoorn |   Netherlands | 55.93s | NR | +1.72s | - | 18 | 3. |   
| Heat 4 |   | time |   | gap | L | ag | Rk |  | 2. Par Arvidsson |   Sweden | 55.21s | NR | +1.00s | - | 18 | 1. |  | 11.Yevgeny Seredin |   Soviet Union | 56.52s |   | +2.31s | - | 20 | 2. |  | 13.Milos Lukasek |   Czechoslovakia | 56.90s |   | +2.69s | - | _ | 3. |   
| Heat 3 |   | time |   | gap | L | ag | Rk |  | 3. Greg Jagenburg |   United States | 55.33s |   | +1.12s | - | 22 | 1. |  | 8. Klaus Steinbach |   West Germany | 56.14s |   | +1.93s | - | 24 | 2. |  | 17.Thomas Ackenhausen |   East Germany | 57.56s |   | +3.35s | - | _ | 3.  |   
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| Heat 2 |   | time |   | gap | L | ag | Rk |  | 7. Dan Thompson |   Canada | 56.13s |   | +1.92s | - | 22 | 1. |  | 12.Tommy Lindell |   Sweden | 56.59s |   | +2.38s | - | _ | 2. |  | 18.Enrique Ledesma Jr |   Ecuador | 57.76s |   | +3.55s | - | 19 | 3. |   
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| Heat 1 |   | time |   | gap | L | ag | Rk  |  | 9. John Mills |   Great Britain | 56.39s |   | +2.18s | - | 25 | 1. |  | 15.Jorge Delgado Jr |   Ecuador | 57.46s |   | +3.25s | - | 24 | 2. |  | 19.Jorge Jaramillo |   Colombia | 57.61s |   | +3.40s | - | 22 | 3. |   
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| 16.Bent Brask |   Norway | 57.47s | NR | +3.26s | - | 20 |   |  | 20.Heinz Steffen |   Switzerland | 58.13s | NR | +3.92s | - | _ |   |  | 21.Mark Morgan |   Australia | 58.27s |   | +4.06s | - | _ |   |  | 22.Shinsuke Kayama |   Japan | 58.26s |   | +4.05s | - | 19 |   |  | 23.Sergey Korotayev |   Soviet Union | 58.29s |   | +4.08s | - | _ |   |  | 24.Arnaldo Perez |   Puerto Rico | 58.38s |   | +4.17s | - | 19 |   |  | 25.Kurt Dittrich |   Austria | 58.68s |   | +4.47s | - | 20 |   |  | 26.Gilles Plancon |   France | 58.72s |   | +4.51s | - | _ |   |  | 27.Tamas Mikola |   Hungary | 58.79s |   | +4.58s | - | 21 |   |  | 28.Yulian Vassilyev |   Bulgaria | 58.92s |   | +4.71s | - | 17 |   |  | 29.Riccardo Urbani |   Italy | 58.97s |   | +4.76s | - | 19 |   |  | 30.Paulo Frischknecht |   Portugal | 59.52s | NR | +5.31s | - | 17 |   |  | 31.Carlos Fontoura |   Brazil | 59.57s |   | +5.36s | - | _ |   |  | 32.Tung-Hsiung Hsu |   Taiwan | 59.69s | NR | +5.48s | - | 23 |   |  | 33.Fernando Canales |   Puerto Rico | 59.92s |   | +5.71s | - | 18 |   |  | 34.David Cummins |   Ireland | 1:00.70 |   | +6.49s | - | 16 |   |  | 35.Victor Oliveira |   Portugal | 1:00.92 |   | +6.71s | - | _ |   |  | 36.Zafer Atamar |   Turkey | 1:01.28 |   | +7.07s | - | _ |   |  | 37.Samir Bouchlaghem |   Tunisia | 1:01.94 |   | +7.73s | - | _ |   |  | 38.David Lindquist |   US Virgin Islands | 1:02.61 |   | +8.40s | - | _ |   |  | -. Bernardo Lesser |   Mexico | DNS |   | - | - | _ |   |  | -. Andres Aguilar |   Costa Rica | DNS |   | - | - | 17 |   |  | -. George Nagy |   Canada | DNS |   | - | - | 21 |   |  | -. Jayad Motaghi |   Iran | DNS |   | - | - | _ |   |   
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