The Mariners acquired left-handed reliever Caleb Ferguson from the Pirates for minor league right-hander Jeter Martinez. Righty Collin Snider has been designated for assignment as the corresponding move. Ferguson is playing on a one-year, $3MM contract and is a free agent at season’s end.
Ferguson, 29, is in the midst of a strong season with Pittsburgh. He’s pitched 43 1/3 innings and logged a 3.74 ERA with a 19.3% strikeout rate and 8% walk rate. He’s allowed only one homer on the season and kept just under 50% of his opponents’ batted balls on the ground.
While Ferguson isn’t a flamethrower who misses bats in bunches — he’s averaging 94.1 mph on his four-seamer this season — he avoids hard contact better than any other reliever in the game. Ferguson’s 83.5 mph average exit velocity is the lowest of any pitcher in Major League Baseball (min. 40 innings). His 25.2% hard-hit rate is second, trailing only Padres standout lefty Adrian Morejon.
Ferguson has pitched in parts of seven major league seasons. He’s totaled a 3.69 earned run average in 305 big league innings. The southpaw typically misses more bats than he has in 2025 (career 26.4% strikeout rate), but he’s currently sporting his lowest walk rate since the shortened 2020 season and has never limited hard contact as well as he’s managed to this year. Ferguson has been an absolute monster against left-handed opponents, limiting them to a pitiful .167/.257/.182 slash in 74 plate appearances. He’s also been strong against right-handers, however, holding them to a .250/.327/.354 slash. It’s not quite dominant, but this is his best production versus righties since 2022.
The Mariners have only had one reliable left-hander in their bullpen this season: Gabe Speier. They’ve given brief looks to Tayler Saucedo, Blas Castaño and Jhonathan Diaz, but no one from that group has even pitched five innings out of the big league bullpen. Ferguson gives skipper Dan Wilson a second southpaw option who, like Speier, can handle both lefties and righties.
Seattle is known to be on the lookout for high-impact talent at the back of the bullpen. Ferguson isn’t necessarily that marquee arm they’ve been seeking, but in all likelihood he’ll be just one of multiple relievers acquired. The Mariners are reportedly making a run at Twins closer Jhoan Duran and have also been tied to young, controllable bullpen arms in Colorado like Seth Halvorsen and Juan Mejia.
As for the Pirates, they’ll…
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