Clayton Kershaw of great TOR types may have been the prime example but a number of others. Baseball is so streaky and so contingent on game variables.. it is why the 69 Mets could win over the best team in baseball.. The best team doesn’t routinely win in the playoffs or Series, the hottest team in the playoffs usually wins.
Kershaw rests alone in the deep trenches of postseason stinkiness. If we look strictly at postseason ERA compared to regular season, Kershaw is almost two runs above. That figure is the worst among pitchers with at least 50 innings in the postseason. The only other pitchers I could find who pitched a minimum of 50 innings in the postseason and had an ERA at least one run higher than their career ERA, are Bret Saberhagen, Greinke, and Vida Blue. Kershaw’s 158 innings are double any of those pitchers in the postseason.
https://baseballegg.com/2019/10/12/is-kershaw-the-worst-great-pitcher-in-postseason-history/