In total, Bratanov was a seven-time Bulgarian champion; five times outdoors in the 400 m hurdles (1972, 1973, 1974, 1978 and 1979) and twice indoors over 400 m (1974 and 1975). At the 1978 European Championships in Prague Bratanov was eliminated in the semi-finals, but at the 1980 Summer Olympics in Moscow he again qualified for the Olympic final; he was the only athlete to make the 400 m hurdles final in both Montreal and Moscow. He suffered a cramp in the Moscow final and placed a clear last in 56.35.