VICE Sports reported Mattingly agreed to a four-year deal with Miami.
Mattingly would be the eighth manager of the Marlins since 2010. Including interim hires, the longest-tenured manager during that time was Mike Redmond (two seasons).
Success in the regular season was no issue for the Dodgers but Mattingly couldn't find the right formula in the playoffs, winning only one postseason series in his tenure.
The Marlins are younger and sport a payroll less than one-third what Mattingly worked with in Los Angeles but expectations are high and patience tends to run low with Marlins' management.