Matz has been diagnosed with a nerve issue in his elbow and could require surgery, Marc Carig of Newsday reports.
Apparently, Matz has been pitching through pain all season, which would help explain his sharp drop-off in performance from last season's 3.40 ERA to this year's 6.08. The nerve issue he's dealing with is thought to be similar to the one that forced fellow starter Jacob deGrom to undergo season-ending surgery last year. Tommy Milone is expected to take his place in the rotation Tuesday and will likely remain in that slot if Matz is forced onto the DL.