He was a five-time Argentine Champion (1942, 1944, 1947, 1962, and 1972).
[1]
Rossetto won the Mar del Plata chess tournament in 1949 and again in 1952 (shared with Julio Bolbochán). He also won in Mar del Plata (KIM) in 1962.[2] In 1964, he qualifield for the Interzonal Tournament in Amsterdam.[3]