Dbacks sign catcher Alex Avila

[Dback Jon]

All three of the primary relievers have ERAs that are highest when Avila is catching. It isn't just Boxberger.

I noticed the other day that sometimes Avila pops his fist into he glove as he is setting up. I tried to discern if there was some pattern to see if maybe Avila was inadvertently tipping pitches.

Correct, it is all three, but none are near as stark as Boxberger