Seventeen-year-old Mauro was signed as an amateur free agent by the Chicago Cubs before the 1944 season.

Mauro got about as late a season call-up as a man could get when the parent Chicago Cubs brought him to Wrigley Field on October 1, 1948.

The Cubbies traded him to the Brooklyn Dodgers for Toby Atwell in December, who sent the 25-year-old Mauro to the International League for his career year, hitting .327 with eleven homers in 140 games for the Montreal Royals in 1952.

From 1964 until his retirement in 1986 he taught, directed student services and coached baseball at Cuesta Junior College in San Luis Obispo, California.

An accomplished pianist, organist and accordionist, he was honored with the establishment of a Carmen Mauro Music Scholarship at Cuesta in 1990.