Mitu is also listed by the Guinness Book of World Records as the tallest professional boxer.

[citation needed] By age 17 he had become so famous that a circus owner from Prague offered him a job, to be presented as a human rarity.

His circus career was brief, but very fortuitous, because he was spotted by the successful Italian boxer and talent scout Umberto Lancia, who taught Mitu how to box and later became his manager.

[4] His first boxing match took place on the Stadionul Venus in Bucharest and his opponent was the experienced Italian boxer Saverio Grizzo.

[citation needed] His second fight was against former Romanian heavyweight champion Dumitru Pavelescu, which Mitu won again by knockout in the first round.