Jiří Vokněr
He won three medals at the ICF Canoe Sprint World Championships with one gold ( 1954: C-1 10000 m ) and two silvers ( 1958: C-1 1000 m , C-1 10000 m ) . 
<triplet> 1954 <subj> ICF Canoe Sprint World Championships <obj> instance of <triplet> 1958 <subj> ICF Canoe Sprint World Championships <obj> sports season of league or competition