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Mariners Sign Michael Fulmer To Minor League Deal

By Darragh McDonald | August 20, 2025 at 5:12pm CDT

The Mariners have signed right-hander Michael Fulmer to a minor league deal, according to his transactions tracker at MLB.com. He had been with the Royals on a minor league deal but the log indicates he was released from that pact a few days ago.

Fulmer, 32, is having a nomadic year. He signed a two-year minor league deal with the Red Sox ahead of the 2024 season. He had undergone UCL surgery and was going to miss that entire campaign. He came into 2025 with a chance to earn a job on Boston’s roster. He didn’t break camp with the club but was called up by mid-April. He was designated for assignment a few days later, clearing waivers and electing free agency.

From there, he landed a minor league deal with the Cubs. He was selected to the big league roster in June but was again cut a few days later. He cleared waivers and elected free agency again, which led him to the Royals.

Around those transactions, he has thrown 5 2/3 big league innings, allowing three earned runs on six hits and two walks with three strikeouts. He has also thrown 54 1/3 Triple-A innings with a 3.98 earned run average, 29.8% strikeout rate and 10.5% walk rate.

Fulmer also has past success on his track record. He initially broke in as a starter with the Tigers and won American League Rookie of the Year in 2016. His results tailed off from there and he wound up in the bullpen, which led to some more good results. He tossed 190 1/3 innings from 2021 to 2023 with a 3.55 ERA, 24.6% strikeout rate and 9.4% walk rate.

As mentioned, Fulmer missed the 2024 season while recovering from surgery. This year, he’s mostly been stuck in the minors but is still getting strikeouts. The M’s recently lost Trent Thornton to an Achilles tear, subtracting a bit of bullpen depth. Fulmer fills in some of that depth without taking up a roster spot.

Photo courtesy of Nathan Ray Seebeck, Imagn Images

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Kansas City Royals Seattle Mariners Transactions Michael Fulmer

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View Comments (11)
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11 Comments

  1. mlb fan

    3 hours ago

    Houston is taking on water in the A.L West. This is the widest open the Mariners’ window has been in decades and I’m a bit surprised that Naylor/Suarez was their “big” deadline move.

    Reply
    • cartography ponderance

      2 hours ago

      That’s where Fulmer comes in!!!!

      1
      Reply
    • myaccount2

      2 hours ago

      Who do you suspect it should have been? Suarez was widely considered the best rental bat on the market and he’s starting to heat up a bit. Naylor was considered the best 1B on the market, which was a huge position I’d need.

      The struggles over the past week and a half are not on the offense, our starting pitching has been terrible.

      5
      Reply
    • SodoMojo90

      3 mins ago

      Who were they supposed go for instead?

      1
      Reply
      • cartography ponderance

        20 seconds ago

        The guy who would’ve had 10 RBIs today!

        Reply
  2. letsplaytwo

    2 hours ago

    WOW! Just about everybody in the baseball world thought that adding Suarez and Naylor for virtually nothing was brilliant.
    This losing streak is because our elite starting pitchers are allowing almost one run for every out they record!!!
    Chill bro – this too shall pass!

    3
    Reply
    • nonchalanto

      23 mins ago

      WOW! If only just about anybody in the baseball world knew that giving up almost a run for every out was a bad thing. Unless they were part of some gambling ring and finally figured out how to take advantage of that “half point” thing for betting lines. I mean “almost a run” has to be insider information right?

      Reply
  3. mike156

    60 mins ago

    Tough career arc. Starts off ROY, has a strong second season, and then….3/4 of his lifetime WAR in those two seasons.

    Reply
  4. Sean P

    52 mins ago

    My elbow hurts just looking at the thumbnail image of his delivery.

    1
    Reply
  5. DonOsbourne

    48 mins ago

    The Cardinals are going to need to start trying to sign a couple of veteran starters to minor league deals. I’m sure the Cardinals were hoping to live out their pipe dream of not having any injuries to the starting rotation but reality is setting in.

    Andre Pallante has completely lost focus. I don’t know if it’s fatigue or something else, but he is gone mentally. The body language is bad. He’s hitting batters, ignoring base runners and allowing easy steals, having pitch clock violations, and mostly just completely unable to locate his pitches. He needs a break of some kind. Old Scrooge DeWitt is just going to have to reach into his rainy day fund and sign a veteran to get through the end of the season without pressing young players into service.

    Reply
  6. bravesfan

    29 mins ago

    For how good he was early in his career, it really stinks how his career spiraled

    Reply

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