He also won (with Zaiga Jansone) the mixed doubles at the 1968 Summer Olympics where tennis was a "demonstration sport".

The same year, he reached the finals of the juniors of Wimbledon Championships, losing to Ismail El Shafei.

There were only demonstration and exhibition tennis events played at the Olympics, and Korotkov who won a gold at the mixed doubles exhibition event and two bronze medals at men's singles and doubles[5] is not considered an Olympic champion.

His highest achievement at this level was winning the 1977 Soviet championships in singles where he defeated Vadim Borisov in the final.

Korotkov was nominated repeatedly for the spot at the Russian Tennis Hall of Fame, but every time lost, first to Sergei Likhachev, then to Teimuraz Kakulia and finally to Andrej Potanin.