Red Sox pitcher undergoes Tommy John surgery

The Red Sox announced to reporters that right-hander Wyatt Mills underwent a successful reconstruction of the right ulnar collateral ligament, the procedure also known as Tommy John surgery.

Mills, now 28, came over to the Red Sox from the Royals in an offseason trade. However, he was shut down in the spring with elbow inflammation and has spent the entire season on the injured list. It will now go down as an entirely lost season for the righty, and he’s likely to lose much of the 2024 campaign as well, given that the procedure typically requires a recovery period of 14 to 18 months.

Originally a draft pick of the Mariners, Mills worked his way up to the big leagues with that club and made his debut in 2021. He posted a 9.95 ERA in a small sample of 12 2/3 innings that year. He had better results in the first half of 2022, with a 4.15 ERA in 8 2/3 innings at the major league level along with a 1.83 ERA in 19 2/3 innings at Triple-A.

The Royals then acquired him as part of the deal where they flipped Carlos Santana to the Mariners. After that deal, Mills registered a 4.79 ERA in 20 2/3 innings in the bigs and a 2.57 mark in 14 Triple-A frames. He finished the year with a 29.9% strikeout rate in the minors while getting grounders on around half the balls he allowed in play. He walked 12.7% of Triple-A hitters and 10.2% in the bigs, but there was clearly a strikeout-grounder combination that intrigued the Red Sox.

Mills lost his roster spot when the Royals signed left-hander Ryan Yarbrough in December, getting designated for assignment. Boston was willing to give him a shot and flipped minor leaguer Jacob Wallace to the Royals to facilitate a deal, also designating first baseman Eric Hosmer for assignment to get Mills onto their roster. The fact that Mills still had an option remaining and less than one year of service time was surely a part of the appeal.

Unfortunately for both Mills and the Sox, the elbow issue has prevented him from making his club debut thus far. He’ll earn a full year of service time here in 2023 while spending the entire campaign on the IL. He’s already on the 60-day IL and isn’t taking up a roster spot but he’ll have to be added back in the winter since there’s no injured list in the offseason. The Sox could put him back on the 60-day IL once spring training begins, but he will have to hang onto his 40-man roster spot all winter long.