For the postseason of 1991, he had a time of ups and downs. In the 1991 American League Championship Series, he appeared in two games against the Toronto Blue Jays, pitching 5.2 innings while allowing just one hit and no runs. In the World Series that year, he appeared in two games, but he recorded no outs, allowing two hits, four runs, four walks in six total batters, having an ERA of infinity.