After graduating from high school in 1935, Christopher maintained his involvement in baseball, playing first in a semi-professional league in the mid-1930s before moving up to professional ball, playing third base for the Smith Falls Beavers of Ontario, Canada (an affiliate of the Class C Can-Am League). Despite having two hits and two RBIs in four at-bats in his first game, Matt soon found that he could not hit minor league pitching consistently and was cut from the team. Although he was offered a spot on the Brockport Blues in the same league, he decided that he was not good enough to play at that level and declined their offer. Christopher returned home to New York, where he played semi-professional ball until a knee injury shortly thereafter ended his career.