After a period on loan at Alessandria (1944), he made his club debut with Torino on 14 October 1945, in a 2–1 defeat to rivals Juventus in the Turin Derby.

In total, he played 103 times for Torino in league matches, scoring once, and won four consecutive Serie A (scudetti) titles between 1945 and 1949.

[1] At international level, he was capped seven times for the Italy national team between 1945 and 1949, scoring one goal.

A fast, powerful, elegant, and technically gifted offensive-minded left-back, who was known for his flair and touch on the ball, Maroso was one of the first-ever attacking full-backs in football, and was even capable of playing as a winger due to his ability to get up the flank; although he stood out for his attacking prowess, he was also strong defensively, courtesy of his foot-work and anticipation, and was capable of playing with either foot.

[1][3][4][5][6] Maroso died with most of the Grande Torino team in the Superga air disaster near Turin, on 4 May 1949.