The Diamondbacks have gotten decent production out of their three catchers, or at least the two they added in the offseason. Jeff Mathis has been a strong defensive catcher and has helped Greinke pitch as the Ace this year while providing a decent amount of offense every now and then. Chris Iannetta has had a big season where a surge in power numbers and a decent walk rate has him hitting above league average. Chris Herrmann has regressed to his pre-2016 numbers at the plate, although some of it has been bad luck and also bad batted ball skills.
Diamondbacks trade LH reliever Gabriel Moya for Twins catcher John Ryan Murphy
