The announcement will be official after the World Series because baseball doesn't like to announce things during the October Classic. He began his coaching career in 2008 with the Rays, then followed manager Joe Maddon from Tampa to the Cubs in 2015, where he and Maddon won a World Series together last season.
The Nationals go through managers quickly, as Martinez will be the franchise's seventh manager since arriving in Washington in 2005.
That hard-nosed policy came back to haunt the Nationals two years ago when they initially selected Bud Black as their manager but saw negotiations break down and the veteran skipper walk away. Before that, Martinez worked for Maddon with the Rays.
David Ross didn't exactly ride off into the sunset once Cubs teammates Anthony Rizzo and Jason Heyward picked him up onto their shoulders and carried him off the field after last year's World Series Game 7 in Cleveland. Since the Lerner family purchsed the club in 2006, no manager had been guaranteed more than two years, not even established and successful skippers like Baker and Davey Johnson.
In giving the Martinez, 53, a three-year contract, Nationals ownership broke with longstanding (and controversial) form.
But the Nationals did not struggle to negotiate with their manager this time, committing three years (and perhaps a fourth) to Martinez in a marked departure from their normal handling of managers.