The Boston Red Sox have become a rather patient franchise under the steady guidance of Craig Breslow, and they once again secured an impactful late-offseason signing when they inked Tommy Kahnle to a minor-league deal with just days until Opening Day.
Unlike Danny Coulombe — who signed a major-league deal late just days earlier — Kahnle isn't a lock for the Red Sox's Opening Day roster. He obviously hasn't pitched in any spring training games yet, just two World Baseball Classic appearances, and he may not be built up enough to handle his normal workload.
Hence the minor-league nature of the deal. It could take a bit of time before the 36-year-old veteran is ready to contribute in Boston, but that's fine. The Red Sox have the bullpen depth to withstand a few weeks of suboptimal rostering choices.
Plus, if Kahnle is anything like other recent New York Yankees converts who opted to join the right side of the rivalry, he could be in for a monster season in 2026.
Tommy Kahnle can follow in Aroldis Chapman's footsteps with Red Sox
The most notable Yankees defect on the Red Sox's roster right now is closer Aroldis Chapman, who recovered from a string of mediocre seasons to emerge as the American League Reliever of the Year in 2025. It really was a vintage season from the legendary southpaw, as he authored a 1.17 ERA, 1.73 FIP, 32 saves, 37.3% strikeout rate, and 2.6 fWAR in his Boston debut.
Most importantly, though, the Sox helped rein in Chapman's command. In the four years before he joined the team, his walk rate had exploded to 15.4%; in his first campaign with the Sox, that figure dropped all the way to 6.6%.
If the Andrew Bailey-led pitching lab could fix Chapman's biggest weakness in his age 37-season, there's no reason why Kahnle can't reemerge as a valuable contributor this year. He's a changeup-dominant pitcher who coerces a lot of weak contact and groundballs, but he doesn't have the stuff to put away most hitters (and, lately, he's also walking too many hitters as well).
His biggest issue with the Tigers last year was hitters hunting his fastball, posting a .349 wOBA against the pitch. He trimmed down his arsenal to just his fastball and changeup; perhaps a reintroduction of his slider or sinker would give him enough weapons to stave off Father Time for a little longer.
No matter what changes the Red Sox implement, Kahnle would be wise to listen. Besides Chapman, Carlos Narváez, Garrett Whitlock, and Greg Weissert are all case studies of former Yankees who have found a new lease on life in Boston.