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Born in St. Petersburg, Russia, Tim Tszyu holds dual citizenship with Australia and Russia. Raised in Sydney, Australia, he is the son of former undisputed light middleweight champion Kostya Tszyu. Beginning his professional career in December 2016, Tszyu quickly rose through the ranks, capturing the WBO Global and Australian super welterweight titles in 2019 and the WBO Asia Pacific super welterweight title in 2020.