In 1965 Cannon shot 21-for-47 to score 49 points, 34 in the second half, to set a Public League and city-leagues postseason record as Lincoln defeated Roxborough High School 84–78.

[5][6] LaSalle finished 20–8 under Coach Jim Hardin in 1967–1968, as Cannon averaged 19.5 points, 9.9 rebounds and 4.8 assists in his junior year.

[7] Under Coach Tom Gola in his senior year, Cannon averaged 19.0 points, 6.4 rebounds and 6.1 assists and received second-team All-America recognition.

La Salle was not permitted to enter the NCAA basketball tournament in Cannon's senior year, despite being ranked #2 in the nation behind UCLA, due to recruiting violations by the school.

As a rookie in 1969–1970, Cannon averaged 11.8 points, 2.5 rebounds and 2.7 assists with the Floridians, who finished 23–61 under coaches Jim Pollard (5–15) and Harold Blitman (18–46).

The 2nd Team was Zelmo Beaty, John Brisker, Joe Caldwell, Cannon, Donnie Freeman and Dan Issel.