Career
Representing East Germany, he was a finalist in men"s 800 metres at the 1980 Summer Olympics and the 1982 European Championships and placed third at the 1981 IAAF World Cup. Wagenknecht lost to Beyer in the 1979 East German championships, but regained his title in 1980. At the 1981 East German championships in Jena Wagenknecht again lost to Beyer, but placed second in a personal best 1:44.81.
He represented East Germany at the 1981 IAAF World Cup in Rome, placing third behind Coe and James Robinson.
Track & Field News ranked Wagenknecht a career-best fifth in the world in its 1981 rankings, the second time (after 1978) that he"d been ranked in the top ten. He was ranked seventh in the world by Track & Field News, his third and final top ten appearance.
At the 1985 IAAF World Cup in Canberra he placed fourth. Nationally, Wagenknecht represented Sports Club Dynamo Berlin.
He was coached by former long-distance runner Jürgen Haase.