Andrés Muñoz can still make hitters look helpless. He can also turn one mistake into a nightmare.
That was the story on September 13, when Muñoz lit up the radar gun at 102.1 mph while working out of the eighth inning, only to watch Lawrence Butler hammer a 101.1-mph fastball for a walk-off homer three batters later. In 14 pitches, the Mariners’ closer managed to show everything that makes him terrifying - and everything that has made this season so maddening.
Muñoz entered with one out, a runner on third and Seattle clinging to a 7-6 lead. He handled the first part just fine, striking out Henry Bolte and getting Jeff McNeil on the first pitch to keep the tying run at third.
Then the ninth inning turned fast. Zack Gelof singled on the first pitch, Muñoz fell behind Butler 3-0, and after working back to one strike, he left a fastball in the middle of the plate.
Butler did the rest. Two batters into the inning, the game was over, and Muñoz had his 10th blown save.
The numbers say regression, at least on the surface. Muñoz has a 4.25 ERA and a 1.18 WHIP over 55 innings.
He’s converted 27 of 37 save chances, and no pitcher in the majors has blown more saves. He allowed two home runs over 62 1/3 innings last season.
This year, he has given up eight in fewer innings.
That usually points to a simpler explanation: less velocity, fewer strikeouts, fewer whiffs. Muñoz doesn’t fit that script.
His 14.07 K/9 is the best of his career. His whiff rate has climbed from 36.5 percent in 2025 to 40.6 percent this season.
His average fastball velocity has jumped from 98.2 mph to 99.6. In other words, he’s throwing harder and missing more bats, yet carrying an ERA nearly two and a half runs higher than last year.
The changeup helps explain part of the puzzle. MLB.com’s Theo DeRosa noted that Muñoz used the pitch only 3.5 percent of the time through July before increasing that rate to 14.8 beginning in August. Hitters are 0-for-19 with 17 strikeouts on at-bats that end with the changeup, and they’ve missed on 24 of 29 swings against it.
So where’s the damage coming from? Contact.
Opponents’ expected weighted on-base average on contact against Muñoz has risen from .331 to .405. His hard-hit rate is up to 42.5 percent, and his barrel rate has climbed from 6.6 percent to 9.2.
The ball still isn’t being put in play all that often. When it is, the results are uglier.
The slider shows the split in his season as clearly as anything. Hitters are batting only .172 against it, and the pitch still carries a 49.3 percent whiff rate. But five of the eight home runs Muñoz has allowed have come on the slider, and opponents are slugging .364 against it after posting a .133 mark last season.
When he’s on, the pitch is untouchable. When it drifts over the plate, it’s a different story entirely.
That’s why the blown saves keep piling up. Elite stuff does not automatically finish games, and Muñoz has given the Mariners too many chances to learn that the hard way. Still, Sunday’s loss wasn’t his alone.
Seattle led 6-2 going into the bottom of the seventh before Gabe Speier and Seranthony Domínguez helped erase the cushion and Randy Arozarena bailed them out again. By the time Muñoz took over, the bullpen had already coughed up four runs. The walk-off belongs to Muñoz on the scorebook, but the larger failure was collective.
Even so, the offseason questions are real. The Mariners have some bullpen decisions ahead, and Muñoz’s $8 million club option will likely be exercised.
He’s 27, throws 100 mph and remains one of the game’s premier bat-missers. But his return should come with help.
Seattle needs another reliever who can handle the ninth inning, and Matt Brash isn’t a trustworthy option because of health issues.
Muñoz still has closer-level stuff. What he no longer has is any claim to closer immunity.
He’ll have to earn that role going into 2027. For now, he stands as a strange case: a pitcher who has become harder to hit and easier to hurt at the same time.
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Anderson and Arroyo both reached the majors, which only sharpened the conversation about what comes next for Seattle. Their progress, along with the rise of Sloan and Celesten, also showed up in a meaningful way in MLB Pipelines prospect rankings, giving the Mariners a deeper and more optimistic look at the future than the standings alone might suggest. [Read more 🡒]