Kapler only lasted two seasons as Phillies' manager, failing to make the postseason for the second year in a row with an under .500 record.
Kapler's firing comes mere hours after the Nationals advanced to their first NLCS playoff appearance in franchise history, without their former star and now Phillie, Bryce Harper. The Nationals eliminated Harper and the Phillies from postseason contention and clinched their Wild Card berth with a doubleheader win Sept. 24, later to sweep the NL East rivals in a five-game series.
The Phillies also announced the termination of pitching coach Chris Young in 2020.
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