Andrés Muñoz, the Mariners' closer, has started to use a changeup more frequently this season and has posted a 1.69 ERA since April 24 as he looks to rebuild trust in his arsenal.
The move is more than tinkering: Muñoz recorded four strikeouts on changeups and has been deliberately diversifying his repertoire to keep hitters off-balance. The uptick in changeup usage comes after a rocky start to the year in which he struggled against left-handed hitters and recorded three losses.
Numbers tell the immediate weight of the story. A 1.69 ERA across the stretch since April 24 is the measurable improvement Muñoz needs to show that his adjustments are working. The four strikeouts on changeups are small in isolation but notable because they demonstrate the pitch can be a weapon, not just a novelty.
Context matters: the changeup adoption is presented by the club as part of a deliberate effort to repair consistency after the early-season setbacks. Muñoz himself is trying to rebuild trust in his pitching arsenal, and adding a reliable off-speed pitch is a classic remedy for power relievers who have been hittable by batters who sit on their fastball.
The tension is simple. Muñoz’s early losses and problems versus left-handed hitters suggest the adjustment still has work to do. A closer’s margin for error is tiny, and an expanded pitch mix must perform under the unique pressure of late innings; what looks promising in a few outings can evaporate when the situations intensify.
What happens next is straightforward. Muñoz may continue refining the changeup while monitoring its effectiveness against hitters, and the Mariners will judge whether the pitch can neutralize left-handed opponents and prevent those late-inning flare-ups that cost games. If successful, Muñoz may solidify his role as a consistent closer for the Mariners — a development that would have immediate bearing on mariners standings as the team fights to hold or gain ground.
The conclusion the facts support is that Muñoz’s recent run is a necessary, not optional, course correction. The 1.69 ERA since April 24 and the four strikeouts on changeups show promise; the three losses and the struggle against left-handed hitters show why the work continues. The most consequential question now is whether the changeup becomes a reliable out pitch against left-handers — if it does, Muñoz’s role stops being a question and starts being an asset.
