In last year’s postseason, the Seattle Mariners repeatedly found themselves short on options against left-handed hitters, a weakness that ultimately hurt them in their series against the Toronto Blue Jays during the American League Championship Series. With only one left-handed arm available in the bullpen, manager Dan Wilson often had limited choices late in games, and those situations proved costly.
Because of that, when Seattle traded for hard-throwing left-hander José Ferrer from the Washington Nationals this offseason, the plan was clear. The Mariners envisioned Ferrer joining forces with their only returning left-handed reliever, Gabe Speier, to create a potentially dangerous lefty duo in the bullpen. If Ferrer continues to show the same promise he displayed in Washington, the two could emerge as one of the most effective left-handed specialist combinations in baseball.
“Gabe handled everything so well last year,” Wilson said. “But having another left-hander we can call on down there with that kind of arm strength is a big advantage.”
Wilson also pointed out that modern lineups often feature multiple left-handed hitters.
“We’ve seen lineups with seven left-handed hitters in there—sometimes even eight,” he said. “Being able to counter that late in games with a couple of lefties is a huge boost.”
Ferrer’s arrival on Dec. 6 came as a surprise to many, largely because of what Seattle gave up to acquire him. The Mariners included highly regarded catching prospect Harry Ford—their first-round pick in 2021—as the centerpiece of the trade. That move underscored just how determined Seattle was to strengthen its bullpen heading into the new season.
Ferrer, however, brings plenty of upside to justify the move. Entering the 2025 season, the 25-year-old owns an 8–4 career record with 12 saves, 121 strikeouts, and a 4.36 ERA across 142 appearances. Over 142.1 innings, he has maintained a solid 1.26 WHIP and has already shown he can handle high-pressure situations, including time spent closing games. According to scouting reports, Ferrer’s sinker averages 97.7 mph while his slider sits around 89.7 mph.
“I think the qualities I have and the tools I bring can definitely help in those moments, especially when you get to that stage,” Ferrer said through an interpreter. “It’s completely different from the regular season, but those are the moments you always dream about playing in.”