 Nyora kupfuurira kweiyi ndima - Bratanov akaenzanisa rekodhi yeBulgaria mumamita mazana mana nezvipingamupinyi 51.8 muna 1971; muna 1972, akahwina mukwikwidzi weBulgaria kekutanga uye akavandudza rekodhi yenyika kusvika pa51.24. Akadzokorora semutambi wenyika muna 1973 na1974; pa1974 European ChampionshipsmuRome akabviswa mumasemi-fainari, asi akaisa rekodhi itsva yeBulgaria ye50.66. Muna 1975 Bratanov akahwina bronze paEuropean Indoor Championships muKatowice sechikwata cheBulgaria anchor mu4 × 2 laps relay. 