Cosman, who came up in 1966 with the St. Louis Cardinals in 1966 and pitched eleven for them in 1966/1967, spent 1968 and 1969 in the Minors before making it back to the Majors in 1970 for one single inning of one single game, allowing three runs on three hits and a walk.
That was all the action he saw for the season before spending all of 1971 in the Minor Leagues in the Cincinnati Reds organization.
For his MLB tenure, he ended up with a 2-0 record, along with a nice 3.05 earned run average over 12 appearances and six starts, throwing 41.1 innings and even tossing a shutout.
As a matter of fact, he tossed that shutout in his MLB debut, beating the Chicago Cubs on October 2nd of 1966 2-0, allowing only two hits and striking out five.
Not a bad way to make your debut!