Martin Klein, Estonian wrestler and coach (d. 1947)
Martin Klein (12 September 1884 – 11 February 1947) was an Estonian wrestler who competed for the Russian Empire at the 1912 Summer Olympics. He won the silver medal in the middleweight class, becoming the first Olympic medalist from Estonia. In the semifinal against the reigning world champion Alfred Asikainen, the two grappled for 11 hours and 40 minutes on a sunny day outdoors, until Klein managed to pin Asikainen. Klein was so exhausted from the bout – the longest wrestling match ever recorded – that he was unable to wrestle for the gold the next day, leaving Swedish wrestler Claes Johansson with the gold medal.