"From Oregon, he picked off 13 passes in his college career. He is the first defensive back ever selected by Buffalo in the opening round."
-John Devaney, Schenley Pro Football Guide 1976
"Clark was an All-Pacific Eight selection of both AP and UPI, and an honorable mention AP All-America. He was a four-year letterman with 13 career interceptions and the first freshman in Pacific Eight history to be named National Player of the Week when he was honored after making two interceptions in Oregon's 15-13 upset of Stanford in 1972. Mario appeared in the East-West Shrine Game and the Senior Bowl and was named defensive player of the game in the Senior Bowl.
Mario is an architecture and real estate major whose hobbies include music and re-upholstering furniture."
-Buffalo Bills 1976 Yearbook