Putting aside World Series-winning managers moving on to other teams (such as Leo Durocher and the 1969 Cubs, Billy Martin and the 1980 A's or Terry Francona and the present-day Indians), I can now confirm that 2020 will be the first year we enter with only one team employing a manager who has previously led that team to a world championship since...1966, when Walter Alston was still in charge of the Dodgers, a team he had taken to four championships overall. This assumes Davey Martinez is still managing the Nationals as of March 26. SEASONS STARTED WITH ONLY ONE MANAGER WHO PREVIOUSLY LED HIS TEAM TO A WORLD CHAMPIONSHIP 1904: Jimmy Collins, Boston (A) 1905: Jimmy Collins Boston (A) 1951: Casey Stengel, New York (A) 1952: Casey Stengel, New York (A) 1953: Casey Stengel, New York (A) 1954: Casey Stengel, New York (A) 1965: Walter Alston, Los Angeles (N) 1966: Walter Alston, Los Angeles (N) 2020: Dave Martinez, Washington (N) Keep in mind John McGraw and Connie Mack won World Series relatively early and stayed in their posts for decades thereafter. From 1981 to 2019, no season had begun with fewer than three previous world champion managers still (or returned to) with the team with whom they won a World Series. As recently as 2010, eight teams began their seasons with managers who had led the franchise to a world championship: Gaston* (1992 & 1993 TOR), Cox (1995 ATL), Scioscia (2002 ANA), Francona (2004 & 2007 BOS), Guillen (2005 CHW), La Russa (2006 STL), Manuel (2008 PHI), Girardi (2009 MFY). *Gaston was in his second term with TOR In 2017, the season started with six such managers: Scioscia, Girardi, Bochy (2010, 2012 & 2014 SFG), Farrell (2013 BOS), Yost (2015 KCR), Maddon (2016 CHC). In 2018, you would have subtracted Girardi and Farrell but added Hinch, giving us five at the dawn of a new campaign. None of the five who began 2019 -- Bochy (retired), Yost (retired), Maddon (fired though moved on), Hinch (suspended/fired), Cora ("mutually parted ways") -- are any longer with the teams with whom they won their managerial rings. Had the Astros hung on in Game Seven, we'd have nobody steering the team he once brought to ultimate glory starting the next season.