Dee ihe ga-aga n'ihu na paragraf a - A mụrụ Katona na Eger, Heves, Hungary. Mgbe ọ dị afọ iri na asaa, Katona nọchitere anya obodo ya na asọmpi egwuregwu mmiri nke Europe nke 1958 nke emere na Budapest, Hungary. Na mita 1500 ọ bịara nke abụọ n'azụ Ian Black iji merie ọlaọcha ọla ọcha, ma merie otu ọla nchara na 4 x 200 mita freestyle relay. Afọ anọ ka e mesịrị na Leipzig na 1962 European Aquatics Championships
, Katona ji ọla edo lọta n'ụlọ n'ọsọ 1500 mita n'ụdị onwe. Na 1960 Summer Olympics na Rome, Katona ruru na ngwụcha nke 1500 mita freestyle ebe ọ kwụsịrị na 5th ebe, ma na 400 mita freestyle na 4 × 200 mita freestyle relay ọ dara iru eru si mbụ gburugburu okpomọkụ. Afọ anọ ka e mesịrị na 1964 Summer Olympics ọ bụ otu ihe ahụ, ọ dara iru finals na 400 mita freestyle ma ọ bụ 4 × 200 mita freestyle relay, ma na 1500 mita freestyle o jisiri rụchaa nke asatọ na ikpeazụ.