Morning Mound Visit: sabermetrics news - 9/13/19

FanGraphs | Ben Clemens: The Diamondbacks, despite nominally rebuilding and shipping off both Zack Greinke and Paul Goldschmidt, have improbably done better, thanks to quite a few excellent transactions from Mike Hazen: trading for Ketel Marte, signing Merrill Kelly, and trading for Carson Kelly and Luke Weaver.

Baseball Prospectus | Rob Arthur ($): Even with all of the legitimate arguments as to why the Red Sox fired Dave Dombrowski, the fact remains: it was a largely unprecedented fire, and there is almost no history of a team firing an executive directly after a World Series win.

The Ringer | Michael Baumann: There’s very little justification for trading Mookie Betts, really. Despite Boston’s insistence on staying under the luxury tax, they still have enough room to wiggle out from under it without even dealing him or JD Martinez, not like they can’t afford the slight overage anyway!