 Mamczarz akamiririra nyika yake kuma2012 Summer Paralympics muLondon uko akahwina menduru yebronze mukusvetuka pakakwirira T42. Mamwe menduru akatevera muIPC Athletics World Championships aine menduru mbiri dzebronze dzakakundwa pakusvetuka pakakwirira muna 2013 muLyonuye muna 2015 muDoha. Mamczarz ndiyewo kaviri European Championships menduru yegoridhe, kuhwina chiitiko chake zvose Swansea 2014 uye Grosseto 2016. 