In 1971 Mygiakis became Greek champion, was used in the featherweight division and, for the first time, participated in an international championship, the World Cup in Sofia.

At the Olympic Games in Munich in 1972 he had three wins again, including one over the Soviet favorite, Jemal Megrelischwili, leading to a seventh place finish.

He beat, among others, Lipień and Tóth again, as well as Kramarenko, and was Olympic champion in spite of a double defeat against Lars Malmkvist from Sweden.

Mygiakis competed at the 1980 Summer Olympics in Moscow and won a gold medal in Greco-Roman wrestling, the featherweight class.

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