7. Mickey Callaway, 2018
Perhaps the most surprising managerial hire in recent memory, the Mets settled on Mickey Callaway following the resignation of Terry Collins in 2017. The Mets were coming off, in my opinion, their most disappointing season since 1987. The pitching staff was in shambles with Jacob deGrom being the only healthy pitcher out of 'the five aces'. The thought process amongst Sandy Alderson and ownership was to hire a great pitching mind from Cleveland and hope he can help turn the starting rotation around.
Though the expectation was lower in 2018 than it was in 2017, the Mets were still expected to contend for a wild-card spot. The team signed 4 multi-year contracts including Jay Bruce and Todd Frazier. It's safe to say 2018 was a disappointment as the Mets went 77-85 including many managerial errors from Callway such as submitting the wrong lineup card and hinting that the players felt "too much pressure". However, Callaway did do what he was asked to do which was turn the rotation around. deGrom won the Cy Young Award, Zack Wheeler had a great second half, and Matz finished with a career high of 154 innings pitched.