The bullpen in the MLB postseason keeps growing in importance. In Game 5 of the 2015 World Series, with the Kansas City Royals leading the series 3-1 against the New York Mets, reliever Wade Davis came out of the bullpen, pitched a shutout inning and helped end the Royals’ 30-year World Series drought. In so doing, he started the current era of MLB postseason bullpen fever. The Royals were patient zero for this fever — building a power pen and winning it all in 2015 — and then the fever spread. Bullpenning a game — using four, five, six relievers to win — has become a thing in baseball and especially a thing in October. The percentage of work given bullpens in the 2013 postseason was 34.8. In the 2017 postseason, that number rose to 46.5 percent. Only four teams in the past 40 years have won a World Series when their bullpen has averaged four walks per nine innings. |