This will not be Matt Koch’s first spell with the Diamondbacks, even though any appearance will be his first. He was previously called up to the the team on July 20, when Taijuan Walker went on the paternity leave list, but did not make it into any games. Koch was sent back down two days later, to make room for Anthony Banda. It’s possible he may suffer the same fate this time, with the D-backs needing to make room for Robbie Ray, when he comes off the disabled list on Thursday.
Koch did appear in seven games last year, including a couple of spot starts late in the season. He had a very credible 2.00 ERA over 18 innings, but has been treated extremely rudely in the Pacific Coast League this year, with an ERA of above ten in 34 innings for the Aces. This is mostly the result of a spectacularly awful start against Nashville on August 5. He was charged with eleven earned runs in just two innings of work, allowing 12 hits, including four home-runs. The resulting Game Score of -13 has not been undercut in the majors by any NL starter since 1936.
Needless to say, we’ll be hoping for better from Koch, and I presume he’ll be slotted into the long-relief role, with which the D-backs have been struggling since Randall Delgado went on the DL in mid-July.