Kammala jumla mai zuwa: Jan Jankiewicz (an haife shi a ranar 17 ga Satumba 1955) ɗan tseren keke ne ɗan Poland mai ritaya. A shekarar 1979 ya lashe lambobin azurfa biyu a tseren hanya a gasar cin kofin duniya.
Gasar tseren keke ta duniya, daban-daban kuma tare da ƙungiyar Poland. Ya yi gasa a wasannin Olympics na 1976 da 1980 a cikin wasanni hudu. A shekara ta 1976, ya gama a matsayi na goma da na biyar a tseren mita 4000, da kansa da kuma tare da ƙungiyar Poland, bi da bi. A shekarar 1980, ya kasance na huɗu a tseren hanya, amma ya kasa kaiwa ƙarshen a tseren tseren kilomita 100.