[1] He competed in the men's Greco-Roman middleweight at the 1908 Summer Olympics.
[2][3] Grundmann was the only German wrestler competing at the games.
He was eliminated in the first round by Dutch Jaap Belmer,[4] and competed for Sportclub Heros 03 Berlin.
He ended the tournament tied for 17th place, and came in at an official weight of 161 lbs (73 kg).
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