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|Competitor for Hungary|
|Silver||1908 London||4x200 m freestyle relay|
He was a member of the Hungarian 1908 Summer Olympics 4x200 metre freestyle relay team that received a silver medal, as well as a member of the Hungarian 4x200 metre freestyle relay team at the 1912 Summer Olympics, which qualified for the final, but did not compete. Zachár was also a member of the Hungarian water polo team which competed in the 1912 tournament.