| Men 100m Backstroke Swimming III World Championship 1978 West Berlin - Sunday, 20th August - Gold Medal: Bob Jackson, United States |
| Final | | time | | gap | L | ag | 50m | | 1. Bob Jackson |  United States | 56.36s | | - | 4 | 21 | 27.55s | | 2. Peter Rocca | United States | 56.69s | | +0.48s | 5 | 21 | 27.49s | | 3. Romulo Arantes Filho |  Brazil | 58.01s | SA | +1.71s | 2 | 21 | 27.70s | | 4. Glenn Patching |  Australia | 58.44s | | +1.82s | 1 | 20 | 28.03s | | 5. Fred Eefting |  Netherlands | 59.10s | NR | +1.74s | 7 | 19 | 28.31s | | 6. Conrado Porta |  Argentina | 59.13s | | +1.83s | 8 | 20 | 28.80s | | -. Viktor Kuznetsov |  Soviet Union | 57.41s | DQ | +1.38s | 3 | 17 | 27.54s | | -. Gary Hurring |  New Zealand | 57.83s | DQ | | 6 | 16 | |
Kuznetsov was disqualified on Sun, Aug 28 by FINA because "of an ofense against the doping regulations." Arantes was awarded the bronze medal.
Traces of anabolic steroids were found in both Kuznetsov's drug test after the Final.
On Aug. 28.1978 Soviet delegation presented portest: "We draw attention to the fact that during the procedure of control and anakysis there were infringements of the FINA Rules and Regulations which cretaed the conditions for interested persons to carry out provocation against the Soviet swimmers.
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| World Record: John Naber, United States 55.49s (26.55s) | | Championship Record: Roland Matthes, East Germany 57.47s 1973 |
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Heats - Sunday, 20th August | | Best 8 times advanced to Final>. |
| Heat 5 | | time | | gap | L | ag | Rk | | 18.Krasimir Petrov |  Bulgaria | 59.78s | NR | +2.83s | - | _ | 4. |
| Heat 4 | | time | | gap | L | ag | Rk | | 2. Peter Rocca | United States | 57.43s | | +0.48s | - | 21 | 1. | | 7. Conrado Porta | Argentina | 58.78s | NR | +1.83s | - | 20 | 2. | | 10.Gary Abraham |  Great Britain | 59.18s | | +2.23s | - | 19 | 3. |
| Heat 3 | | time | | gap | L | ag | Rk | | -. Viktor Kuznetsov | Soviet Union | 57.56s | NR | +0.61s | - | 17 | 1. | | 5. Fred Eefting | Netherlands | 58.69s | NR | +1.74s | - | 19 | 2. | | 8. Zoltan Verraszto |  Hungary | 58.83s | | +1.88s | - | 22 | 3. | | 13.Michael Soderlund |  Sweden | 59.43s | | +2.48s | - | 16 | 4. | | 25.Genaro Otero |  Colombia | 1:01.71 | | +4.76s | - | _ | 5. | | 31.Zafer Atamar |  Turkey | 1:04.58 | | +7.63s | - | _ | 6. |
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| Heat 2 | | time | | gap | L | ag | Rk | | 9. Carlos Berrocal |  Puerto Rico | 59.03s | | +2.08s | - | 21 | 1. | | 11.Lutz Wanja |  East Germany | 59.20s | | +2.25s | - | 22 | 2. | | 12.Dec Thorell | Sweden | 59.23s | | +2.28s | - | 19 | 3. |
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| Heat 1 | | time | | gap | L | ag | Rk | | 3. Gary Hurring | New Zealand | 58.33s | NR | +1.38s | - | 16 | 1. | | 6. Glenn Patching | Australia | 58.77s | | +1.82s | - | 20 | 2. | | 16.Reinhold Backer |  Germany | 59.65s | | +2.70s | - | _ | 3. | | 19.Jim Carter | Great Britain | 1:00.59 | | +3.64s | - | 21 | 4. |
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| Heat - | | time | | gap | L | ag | Rk | | 1. Bob Jackson | United States | 56.95s | | - | - | 21 | | | 4. Romulo Arantes Filho | Brazil | 58.66s | | +1.71s | - | 21 | | | 14.Wade Flemons |  Canada | 59.54s | | +2.59s | - | _ | | | 17.Thomas Ackenhausen | East Germany | 59.73s | | +2.78s | - | _ | | | 20.Jake Tapp | Canada | 1:00.61 | | +3.66s | - | _ | | | 21.Thomas Lebherz |  West Germany | 1:00.94 | | +3.99s | - | 15 | | | 22.Noriyoshi Mishina |  Japan | 1:01.17 | | +4.22s | - | _ | | | 23.Sandor Wladar | Hungary | 1:01.50 | | +4.55s | - | 15 | | | 26.Jose Luis Yepez |  Ecuador | 1:01.84 | | +4.89s | - | _ | | | 27.Danielle Cerabino |  Italy | 1:01.92 | | +4.97s | - | _ | | | 28.Erich Thomann |  Switzerland | 1:02.38 | | +5.43s | - | _ | | | 29.Leszek Gorski |  Poland | 1:02.59 | | +5.64s | - | 17 | | | 30.Luki Niode |  Indonesia | 1:03.77 | NR | +6.82s | - | 14 | | | 32.David Lindquist |  US Virgin Islands | 1:04.81 | NR | +7.86s | - | _ | | | 33.Jasim Zablah |  Kuwait | 1:14.10 | NR | +17.15s | - | _ | | | -. Waleed Ali | Kuwait | DSQ | | - | - | _ | | | -. David Cummins |  Ireland | DNS | | - | - | 16 | | | -. Lan Bullock | New Zealand | DNS | | - | - | _ | |
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Czechoslovakia