During his rookie season, the Yanks became the Dallas Texans, which became the Baltimore Colts in 1953. Marchetti played 13 seasons with the Colts and helped them win NFL Championships in 1958 and 1959. During his career, he was noted for being effective against the run and a relentless pass-rusher. He was voted "the greatest defensive end in pro football history" by the Pro Football Hall of Fame in 1972.[2]
He moved to left offensive tackle in 1954, a position Marchetti hated, but admitted that it taught him how to beat a blocker. He returned to defensive end in 1955 and made his first Pro Bowl.He was enshrined in the Bay Area Sports Hall of Fame in 1985.[4] He is also a member of the National Italian American Sports Hall of Fame.