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Martin Gruber (born November 11, 1975 in Brixen) is an Italian luger who has competed since 1992. A natural track luger, he won the men's singles silver medal at the 1998 FIL World Luge Natural Track Championships in Rautavaara, Finland. Gruber also won a silver medal in the same event at the 1995 FIL European Luge Natural Track Championships in Kandalaksha, Russia.