At the beginning of his career, Napolitano took 5th place in Venice in 1928. Then, he won at Milan 1934. He had played many times in the Italian championships and local tournaments – before, during and after World War II. In 1935, he took 6th in Florence (6th ITA-ch; Antonio Sacconi won). In 1938, he tied for 4-6 th in Savona (Vincenzo Castaldi won). In 1938, he won in Milan. In 1939, he tied for 3rd-4th in Rome (9th ITA-ch; Mario Monticelli won). In 1942, Napolitano took 11th in Munich (1st European championship). The event was won by Alexander Alekhine. In 1943, he took 2nd, behind Vincenzo Nestler, in Florence (10th ITA-ch).