Boxberger agreed to a one-year, $2.2 million contract with the Royals on Wednesday, Jon Heyman of FancredSports.com reports.
The 30-year-old reliever will receive a nice raise after compiling a 4.39 ERA, 71:32 K:BB and 32 saves in 53.1 innings last season with the Diamondbacks. Given that Wily Peralta is the only real competition for saves in Kansas City, Boxberger figures to be a contender for the Royals' closer role from the get-go, boosting his fantasy stock after a lackluster finish to 2018.