Ηis parents, Dimitris, owner of a motorbike workshop, and Kalliope, a weaver, gave birth to five boys.
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In 1995, Giannakis moved to Panathinaikos, where he finally won the Euroleague title in 1996, in Paris.
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Giannakis led the Greek junior national team to the silver medal at the FIBA Europe Under-16 Championship of 1975.
Georgios B. Giannakis | Panagiotis Liadelis | Panagiotis Kondylis | Panagiotis Giannakis | Panagiotis Angelopoulos |
The tournament featured famous international basketball players such as Dražen Petrović, Nikos Galis, Rik Smits, and Panagiotis Giannakis.