The A’s previously designated the right-handed Mengden for assignment Sept. 20, which came a little over a month after his most recent appearance on Aug. 18. Mengden threw 12 1/3 innings of five-run ball earlier this year, but he spent time on the COVID-19 injured list before the A’s designated him.
Now 27, Mengden debuted in 2016 and emerged as a respectable piece of the A’s staff the next season. In fact, from 2017-18, Mengden combined for a 3.80 ERA/4.57 FIP with 5.73 K/9 and 1.99 BB/9 over 158 2/3 innings and 29 appearances (24 starts). Mengden’s output has dropped since that two-year stretch, though, largely because of a major increase in walk rate. He has issued 4.25 free passes per nine, logged 6.5 K/9 and posted a 4.63 ERA/4.85 FIP over 72 innings since 2019.