Mitri made his professional debut right after the end of World War II on 31 July 1946 in Venice where he defeated Alfredo Pamio with a KO.
During this period, he won the Italian middleweight crown in 1948 by defeating Giovanni Manca and the European title with a points win over Cyrille Delannoit.
[1] In 1950 Mitri earned the right to be Jake LaMotta's mandatory challenger for the world middleweight championship once Rocky Graziano dropped out.
[4] The official scores, according to the New York State Athletic Commission, lists the three judges's scorecard unanimously in LaMotta's favour with Mark Conn 3-12, Joe Agnello 6-9, and Bert Grant 7-8.
[6] Mitri's last moment of glory was on New Year's Day in 1956, when he defeated Bill Jo Cohen after the American boxer refused to answer the bell for the 8th round.