"match unsuitable, unfitly, or inaccurately," 1590s, from mis- (1) "badly, wrongly" + match (v.). In later use especially of marriage. Related: Mismatched; mismatching.
"a bad match, discrepancy, lack of correspondence," c. 1600, from mis- (1) "bad, wrong" + match (n.2). Sports sense of "unfair contest due to unequal abilities" is by 1954. Related: Mismatchment (1841).