Tretiak competed in men's sabre at the 2004 Summer Olympics.

He reached the semifinals after defeating teammate Volodymyr Lukashenko, but lost to Hungary's Zsolt Nemcsik.

He prevailed over Dmitry Lapkes of Belarus to take the bronze medal.

At the 2006 World Fencing Championships he won a silver medal in the sabre team event together with Dmytro Boiko, Volodymyr Lukashenko and Oleh Shturbabin.

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