The Nationals go through managers quickly, as Martinez will be the franchise's seventh manager since arriving in Washington in 2005.
Martinez, Joe Maddon's bench coach since 2008, interviewed recently in Washington.
Martinez, 53, has served as Joe Maddon's bench since their days with Tampa Bay, when the duo also formed a manager-bench coach duo for the Rays.
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In a conference call earlier in October, Nationals General Manager Mike Rizzo called Baker "a Hall of Fame-type manager", but said that the expectations of the team had grown along with their success. The Red Sox and Mets each hired first-time managers and gave each of them three guaranteed years, establishing a baseline for negotiations with Martinez. The Cubs advanced to the NLCS in Martinez's other two seasons with Maddon in Chicago.
The Nationals then offered the job to Dusty Baker. He is fluent in Spanish, well-versed in advanced analytics and multiple Nationals players have spoken highly of him. Two years later, Williams was sacked following a debacle in 2015. He has always been a rumored candidate for a step up to a managerial spot, and Washington will provide that opportunity.
Martinez has been a candidate for several managerial openings in recent years. An official announcement is not expected to come until after the World Series, which is typical for such things. The Astros and Dodgers - both of whom have young managers similar to Martinez - play Game 5 of the World Series Sunday before an off-day Monday.