The Cleveland Browns selected Kanicki in the second round of the
1963 NFL draft, 23rd overall. The Buffalo Bills selected Kanicki in the 7th round of the 1963 AFL draft, 52nd overall. He chose to play for Cleveland, though he had initially signed with the Bills. The Bills contract was declared invalid since Kanicki was not 21 when he signed it. As a rookie in 1963, Kanicki played in 13 games, but started in only one game, as a backup to
Pro Bowl tackle
Bob Gain and Frank Parker. Kanicki started nine games in 1964 at right defensive tackle, replacing Parker. He played an important part in the Browns
1964 NFL championship victory over the Baltimore Colts. He would be facing Colts future hall of fame
offensive guard Jim Parker, and it was anticipated that this matchup would strongly favor the Colts. Instead, Kanicki and Modzelewski provided a strong inside rush against the Colts, that forced Colts Hall of Fame quarterback
Johnny Unitas into hurrying his passes. Colts Hall of Fame coach
Don Shula said that the Browns entire defensive line of Kanicki, Modzelewski,
Bill Glass and
Paul Wiggin, dominated the Colts that day. Kanicki had .5
quarterback sacks in the game, and Glass 1.5. From 1966-68, Kanicki started 34 games, next to Modzelewski's successor
Walter Johnson (who was named to the Pro Bowl, 1967-68). Kanicki had 17.5 sacks over those three years, with his career high 7.5 coming in 1968. Kanicki played in an era when the head slap was legal, and because of his power, he used it to great effect in stunning opposing linemen. but lost the 1969 NFL championship game to the
Minnesota Vikings. In six years as a starter, Kanicki had gone to the NFL championship game four times. In 1970, however, the Browns, to Kanicki's surprise and shock, traded him along with
running back Ron Johnson and
linebacker Wayne Meylan to the New York Giants for wide receiver
Homer Jones. (whom Jones was to replace) to the
Miami Dolphins for the third overall draft pick in the
1970 draft, which they intended to use to draft quarterback
Mike Phipps; now considered one of the worst trades in Browns' history. Kanicki had 4.5 sacks for the Giants in 1970, and the Giants pass rush improved with his presence. Running back Johnson led the NFL in total
yards from scrimmage in 1970, and became a first-team All Pro that year. Jones suffered knee injuries that limited him to only four starts with the Browns in 1970, and he retired at the end of the year. 1971 was Kanicki's final year in the NFL, at age 30. He started 9 of 14 games and had two sacks for the Giants. The Giants finished the year with a 4–10 record. He suffered an Achilles tendon injury in early 1972 when he slipped and fell on ice near his Ohio home. He retired from the NFL and did not play in 1972. == Legacy ==