 He represented his country twice at the Olympic Games, reaching the finals in both 1964 and 1968.Bleznitsov won two medals at the Universiade, winning the 1963 title in a championship record of 4.60 m before taking a silver in 1965 behind American John Pennel.He was the inaugural pole vault champion at the annual 1966 European Indoor Games and won three silver medals in the subsequent years, beaten by fellow Soviet Igor Feld and East Germany's Wolfgang Nordwig.