Devin Williams’ move to the injured list has opened the door for a Mets experiment that sounds bold, maybe even a little reckless: Kodai Senga in the closer role.
Williams, who was placed on the injured list Monday with a right shoulder strain after reporting arm fatigue last week, is not expected to be out long. Andy Green said Monday in Atlanta that he believes Williams will pitch again this year. Still, the Mets are in a spot where they can afford to think creatively, and that’s where Senga enters the picture.
The idea is simple enough. If the Mets are going to keep sorting through a gutted bullpen, why not see whether Senga can handle the ninth inning? Green has not locked him into anything, but he made it clear the team is willing to keep testing him in relief.
“I think we’ll stop short of being declarative right now,” he told reporters. “Flexibility is one of our greatest strengths right now.
Nobody is attached to a defined role. He’s done a really nice job in a couple of his bullpen outings and I’m excited to see him continue to get tested that way.”
That matters because Senga is not exactly a clean, simple roster decision. After his breakout 2023 season, he’s been a mess of injuries and inconsistency.
He was hurt throughout 2024, then struggled badly enough in 2025 that he accepted a trip to Triple-A Syracuse. He carries an 8.29 ERA this season, is guaranteed $30 million over the next two years, and has a conditional club option in 2028, when he’ll be 35.
At this point, he’s nearly impossible to move.
But the Mets also have the luxury of playing with ideas while other teams are chasing precision. With the season where it is, the value is in seeing what actually works.
Senga’s recent relief work gives the concept some real footing. On Aug. 4, he worked the ninth inning of a 6-2 game and reached 98.8 mph with his fastball.
Two days later, he came in during the seventh to face the heart of the Guardians order and retired the side, firing a 100.4-mph fastball and throwing only one pitch that wasn’t a fastball or forkball. That kind of sharp, stripped-down approach may suit him better than the starter’s full menu.
There’s also a confidence element here. Senga has repeatedly said he feels like a different pitcher since the injuries that altered his 2024 season, specifically a shoulder capsule strain and a calf strain that affected his mechanics.
By this year, he acknowledged there could be a mental piece to the problem as well. In relief, he has looked freer, and that alone makes the trial worth something.
The stuff plays, too. Senga began his career in Japan as a reliever, and in short bursts he can lean on his two best weapons: the fastball and the ghost fork.
This season, his fastball has averaged 96.2 mph, but that number has dipped closer to 95 mph when he’s been starting regularly. In shorter outings, the Mets may be able to get more of the velocity that makes him dangerous.
There are other arms in the mix, including Daniel Duarte and Jefry Yan, with Yan bringing the eye-catching ability to reach 100 mph. Both are cheaper and easier to move between the majors and Syracuse. But if the Mets want the biggest payoff, Senga is the one worth pushing.
Green sounded open to that kind of internal competition.
“If guys latch onto roles and show dominance in a particular capacity, you want to give them some level of certainty,” he said. “Guys thrive when they know what their expectations are.
We’re not there right now. Guys also thrive when they earn something and they’re not just given something.”
So Senga has to take it. That’s the test. And if he does, the Mets may have found something useful in a season that has offered them plenty of reasons to look for it.
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