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Inside The Mariners

Mariners Probable Starters vs. Guardians, Logan Gilbert Becomes the Piggyback Flashpoint

The Mariners have a winnable series ahead, but their rotation plan is doing them no favors with fans.
Jun 21, 2026; Seattle, Washington, USA; Seattle Mariners starting pitcher Logan Gilbert (36) throws against the Boston Red Sox during the first inning at T-Mobile Park. Mandatory Credit: Joe Nicholson-Imagn Images
Jun 21, 2026; Seattle, Washington, USA; Seattle Mariners starting pitcher Logan Gilbert (36) throws against the Boston Red Sox during the first inning at T-Mobile Park. Mandatory Credit: Joe Nicholson-Imagn Images | Joe Nicholson-Imagn Images

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The Mariners are walking into Cleveland with a series that feels like it could go either way. The Guardians are 42-39, good enough to respect but not exactly good enough to fear. Their offense has been pedestrian at best, and the underlying numbers don’t say there’s a sleeping giant here. They own a team .228 batting average, and their .235 xBA doesn’t lay a ground argument for better days ahead. The Guardians also sit in the bottom 3rd percentile in barrel rate at 6.2 percent.

The M’s pitching have a real chance to control this series. But, of course, nothing with the Mariners can be normal right now.

They’re still working through their rotating piggyback plan. Their offense is stuck in an 11-game drought where they haven’t scored more than three runs in a game. And the Guardians’ pitching can hold its own, too. The Mariners are fifth in baseball with a 3.71 team ERA, while the Guardians are right behind them in sixth at 3.79.

Here’s a look at the matchups over the weekend.

Mariners Probable Starters Against the Guardians

Friday, June 26, 4:10 p.m. PT: RHP Luis Castillo (2-6, 5.22 ERA) vs. LHP Joey Cantillo (6-3, 4.05 ERA)

Saturday, June 27, 4:10 p.m. PT: RHP Logan Gilbert (6-4, 3.29 ERA) / RHP Emerson Hancock (5-4, 3.60 ERA) vs. RHP Slade Cecconi (3-6, 4.48 ERA)

Sunday, June 28, 10:40 a.m. PT: RHP George Kirby (6-7, 3.94 ERA) vs. RHP Gavin Williams (9-4, 3.82 ERA)

It makes sense to piggyback around the back end of the rotation. It’s another thing entirely to take one of your hottest starters, one who just earned AL Player of the Week honors, and put a built-in ceiling over his outing. And M’s fans are having a really hard time trying to stay quiet.

The outrage is fair because Gilbert has been dealing. He has a 1.49 ERA over his previous six starts. He’s looked like the kind of starter who should be handed the ball and left alone until the game tells the manager otherwise. And even though it’s been said repeatedly that this is a decision the entire rotation agreed on, at some point, the best plan is letting your best arms go win games.

That’s the friction in its entirety. When a pitcher like Gilbert is rolling and the manager still has a pre-loaded hook, fans are going to see it as overthinking. It’s hard to look at an underperforming team that’s sitting 41-41 and not see these moments as another example of them getting in their own way.

The good news is the Guardians offense is also struggling. It makes this a winnable series. But that doesn’t mean it’s going to be easy. It’s dead even pitching matchup, and we wouldn’t expect a ton of runs to be scored. But if the Mariners lose a low-scoring game after Gilbert gets cut short while cruising, the reaction is going to be predictable, loud, and justified.

The piggyback plan may be built with the long game in mind, but the standings do not pause for cleverness. Seattle needs wins. And this weekend, with Gilbert sitting right in the middle of the experiment, the Mariners are about to find out how much patience this plan really has left.

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Tremayne Person
TREMAYNE PERSON

Tremayne Person is the Publisher for Mariners On SI and the Site Expert at Friars on Base, with additional bylines across FanSided’s MLB division. He founded the Keep It Electric podcast in 2023 and covers baseball with a blend of analysis, context, and a little well-timed side-eye just to keep things honest. Tremayne grew up a Mariners fan in Richmond, Va., and that passion ultimately led him to move to Seattle to cover the team closely and become a regular at home games. Through his writing, he connects with fans who want a deeper, more personal understanding of the game. When he’s not at T-Mobile Park, he’s with his dog, gaming, or finding the next storyline worth digging into.

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