The Mariners have placed right-hander Penn Murfee on the 15-day injured list due to right elbow inflammation, according to Ryan Divish of the Seattle Times (Twitter link). Right-hander Juan Then is being called up from Double-A in the corresponding move, and Then’s first appearance will mark his MLB debut.
Murfee made his own Major League debut in 2022 and immediately contributed to Seattle’s bullpen, posting a 2.99 ERA over 69 1/3 innings. Murfee’s strikeout and walk rates were well above average, and he was one of the league’s best at inducing soft contact. The overall results have improved this season as per Murfee’s 1.38 ERA over 15 innings, except with the red flag of a drastically inflated 16.7% walk rate. A tiny .143 BABIP has certainly helped Murfee avoid much damage, though his SIERA is 4.52.
Walks have been a problem for the Mariners’ bullpen as a whole this season, even though the relief corps has still been quite solid overall. However, it isn’t good news that the M’s are now missing two notable relievers in Murfee and Andres Munoz, who has spent close to a month on the 15-day IL due to a right deltoid strain that seems to be a bit more troublesome than initially anticipated. For what it’s worth, Murfee’s elbow inflammation also seems relatively minor, as Divish tweets that the Mariners were hoping he could avoid an IL trip altogether.
Then was added to Seattle’s 40-man roster back in November, protecting righty from selection in the Rule 5 Draft. Then was an international signing for the Mariners in 2016, and after being traded to the Yankees in November 2017, was re-acquired as part of the Edwin Encarnacion trade in June 2019. Once the 2019 season was complete, things started to go sideways for Then, who (like all minor leaguers) lost the 2020 season to the pandemic, and then struggled through two injury-shortened seasons at the high-A and Double-A levels in 2021 and 2022.
MLB Pipeline ranks Then 23rd on their list of the Mariners’ top 30 prospects, noting that his performance in the Arizona Fall League merited a return to the ranking and apparently indicated that his elbow problems were behind him. Back at Double-A this season, Then has a 27.5% strikeout rate and 7.5% walk rate over nine innings of work, but also a 5.00 ERA.
To this end, promoting Then to the majors and skipping Triple-A entirely seems like an aggressive move for the Mariners, based both on results and the fact that Then has pitched only 30 total innings (counting AFL and Dominican Winter League work) since the start of the 2022 season. It could be that the M’s might be viewing Then as just a short-term add before figuring out a 40-man roster opening to accommodate another pitcher.