Date of Birth: 
Place of Birth: Starnberg, Bavaria, Germany
About Johannes Trefz
- Johannes Trefz (born 7 June 1992 in Starnberg) is a German sprinter specialising in the 400 metres.
- He won a bronze medal in the 4 × 400 metres relay at the 2011 European Junior Championships. His personal best in the event is 45.70 seconds set in Nuremberg in 2018.
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