During the second week of August 26 years ago I happened to see a dude coming out from a hotel in Helsinki, crossing the busy main road with a few kangaroo-like leaps and vanishing into the park by the sea.
I remember clearly how relaxed he was, but strangely his pace seemed extremely fast compared to joggers like me. I didn't know who he was, but I knew he had to be a top athlete.
Then on next Sunday I saw this guy winning the marathon of the World Championships on TV. They called him Deek. I said hey I've seen this champ on a recent training run.
The following video compilation of great marathon finishes by Robert de Castella includes Helsinki World Championships 1983 marathon (1:12-1:52).