Hannecker represented the sports clubs MTV Ingolstadt and LC Olympiapark München, and became West German champion in 1986 and 1987. His personal best throw was 65.90 metres, achieved in May 1988 in Bensheim.
|Representing West Germany|
|1986||European Championships||Stuttgart, West Germany||12th|
|1987||World Championships||Rome, Italy||11th|
|1988||Olympic Games||Seoul, South Korea||8th|
|1990||European Championships||Split, Yugoslavia||10th|
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