In December 1978, Seaman was traded with outfielder Tom Grieve to the St. Louis Cardinals for pitcher Pete Falcone [REF].
Seaman made his MLB debut on September 28, 1979, pitching 2 innings of scoreless, no-hit relief (although he did surrender 2 walks) against the New York Mets in the first game of a double-header; the Cardinals lost 6-2 [REF].