So far the following managers have been dismissed from their previous position:
AL
Royals - Ned Yost
Angels - Brad Ausmus
NL
Giants - Bruce Bochy (Retiring)
Padres - Andy Green
Pirates - Clint Hurdle
Cubs - Joe Maddon
Mets - Mickey Callaway
Phillies - Gabe Kapler
I don't remember an offseason with so many managers fired like this one and Dave Roberts might join them pretty soon after the way the dodgers were eliminated last night