An out-and-out sprinter, his preferred distance was in fact the 200 m (not included on the Olympic schedule). In 1997 he became European C-1 200 m champion in Plovdiv, Bulgaria. The following year he won the silver medal in Szeged, Hungary. In 1999 he was a bronze medallist at both the World and European Championships. Kňazovický also earned a bronze in the C-4 500 m event at the 1994 World championships in Mexico City.