By Paul Taylor Posted on

Mariners benefit from strong Luis Castillo outing in Cleveland

Luis Castillo gives the Mariners a much-needed boost in a 3-1 win versus the Guardians, in the process improving his potential trade value.

The Mariners needed that one on Friday night, following a demoralizing series in Pittsburgh which was lost despite not having to face Paul Skenes or any southpaw starters. Sure, they increased their streak of three-or-less runs to 12 games, but a win is a win, as the M’s moved back above .500 thanks to beating the Guardians 3-1 on the road.

Perhaps the most important thing to come from Friday’s series opener in Cleveland — aside from the actual win — was a strong outing from Luis Castillo. He equalled a season high of going 6.0 innings, and kept the damage to a minimum in allowing just four hits, a walk and one earned run, while striking out four.

It’s no secret that Castillo has been the poorest member of the Mariners rotation in 2026, highlighted by an unsightly -0.6 bWAR. In fact, he’s currently projected to set career worsts in several categories, including a 4.93 ERA, 81 ERA+, 9.2 hits per nine innings, 2.81 SO/BB ratio and a 21.5 percent strikeout rate.

Given this combination, it is at least understandable why plenty within the Mariners fanbase are frustrated by the piggyback strategy being deployed by the team. Critics see this as trying to appease a pitcher’s ego, even though it’s to the detriment of the rest of the rotation.

Luis Castillo actually trending positively in recent outings

However, there is reason to understand why the Mariners have taken this approach, and not just because it’s a way to keep everyone engaged if one of the starters suffers an injury. This is also about attempting to improve Castillo’s trade value, which would be less likely to happen if he was moved to the bullpen.

Sure, we appreciate that Castillo’s $24.15 million cap hit is an albatross of sorts, with it continuing next season. (There’s also a $25 million vesting option in 2028, pending pitching 180.0 innings next year.) It would be one thing to take on board this kind of salary if he was still an All-Star and a Cy Young candidate, but it’s now even less attractive these days.

However, for what it’s worth, Castillo has improved of late in his last six outings. Here’s a comparison split for different stages of the 2026 season to date:

ERAFIPWHIPIP
Overall4.933.941.3676.2
Games 1-106.414.531.5546.1
Games 11-162.673.041.0530.1

Luis Castillo’s future with the Mariners is open to debate

We understand six games is a small sample size, and that this period includes the meltdown at home to the Red Sox, when he allowed seven hits and five runs (four earned) in 4.0 innings. Still, his ERA and WHIP in the past six games would both project to career-lows over a full season, and he’s at least improving his stock.

The plan is to keep deploying the modified version of the piggyback strategy until the All-Star break, which begins on July 13. By that point we’ll also be three weeks away from the Aug. 3 trade deadline, and it will be interesting to see where Castillo is at, in terms of his form and value.

There is a line of thinking that you can never have enough pitching, and we get that. However, with Kade Anderson and Ryan Sloan progressing faster than expected there’s a potential logjam looming, with at least one of the young prospects now expected to make their Major League debut this season.

Overall, you’d probably still lean towards Castillo staying in Seattle for at least the remainder of this season, due to the combination of his salary, age and being a declining asset overall. However, if he continues to pitch at a similar level to his past six outings, things could still conceivably take a different turn.

Photos court​‌esy of Tim Rogers Photography

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