A native of Youngstown, Ohio, Mancini began his professional career in 1937, trained by Hall of Fame trainer Ray Arcel.
In May 1941, he fought reigning NBA lightweight champion Sammy Angott in a non-title fight, losing by a close split decision.
[1] However, shortly afterwards the United States entered World War II and Mancini was drafted, denying him the chance to fight for the championship.
[1] After recovering from his injuries he resumed his boxing career, now in the welterweight and middleweight divisions.
However, he was unable to establish himself and retired after consecutive points losses to Harry Hurst and Rocky Castellani, with a final record of 45-12-3.