| Date | 18 October 1968 | |
|---|---|---|
| Location | Velódromo Olímpico Agustín Melgar, Ciudad Deportiva Magdalena Mixhuca, Ciudad de México | |
| Format | Winner of each heat advanced to the eighth-finals. | |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Sergey Kravtsov | 10.87 | |||
| 2 | Sanji Inoue | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Leslie King | 11.16 | |||
| 2 | José Mercado | – | |||
| 3 | Ian Alsop | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Tim Mountford | 11.31 | 1 | ||
| 2 | Peder Pedersen | – | 2 |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Robert Van Lancker | 10.99 | |||
| 2 | András Baranyecz | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Reg Barnett | 11.01 | |||
| 2 | John Nicholson | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Jan Jansen | 11.13 | |||
| 2 | Daniel Goens | – | |||
| 3 | José Pittaro | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Dino Verzini | 11.04 | |||
| 2 | Carlos Roqueiro | – |
| Pos | Competitor | NOC | Time | ||
|---|---|---|---|---|---|
| 1 | Leijn Loevesijn | 11.91 | |||
| 2 | Jocelyn Lovell | – |