| Date | 18 October 1968 |
|---|---|
| Location | Alberca Olímpica Francisco Márquez, Ciudad de México |
| Pos | Lane | Competitor | NOC | Time | |||
|---|---|---|---|---|---|---|---|
| 1 | 7 | Zac Zorn |  USA | 54.3 | |||
| 2 | 5 | Wolfgang Kremer |  FRG | 55.0 | |||
| 3 | 1 | Gábor Kucsera |  HUN | 55.1 | |||
| 4 | 6 | Csaba Csatlós | HUN | 56.6 | |||
| 5 | 3 | Herman Verbauwen |  BEL | 57.5 | |||
| 6 | 2 | Federico Sicard |  COL | 59.0 | |||
| 7 | 4 | Yacoub Masboungi |  LBN | 1:00.5 | |||
| – | Bo Westergren |  SWE | – |
