 Kọ itẹsiwaju fun paragirafi yii - Zenz gba ami ẹyẹ mẹta ni ICF Canoe Sprint World Championships pẹlu wura kan K-1 500 m: 1954 : fun Saar ati idẹ meji K-1 500 m ati K-2 500 m: mejeeji 1958 fun West Germany. 