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0:33Mariners Place Cal Raleigh on IL with Oblique Injury
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2026 Pitching
| STATS |
IP
Innings Pitched
|
W
Wins
|
L
Losses
|
ERA
Earned Run Average
|
SO
Strikeouts
|
BB
Base on Balls (Walk)
|
|---|---|---|---|---|---|---|
| Regular Season | 55.1 | 2 | 5 | 5.53 | 56 | 22 |
Top Luis Castillo News
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Mariners' Luis Castillo: Receiving start Sunday
Castillo is slated to start Sunday's game against the Tigers, Adam Jude of The Seattle Times reports.
Castillo and Bryce Miller worked in tandem in each of the previous three turns through the rotation, but both pitchers will receive standalone starts during the final two games of the series in Detroit. Though he currently maintains an ugly 5.53 ERA and 1.45 WHIP on the season, Castillo took some steps forward over his last two outings, covering nine innings between a start and relief appearance behind Miller while striking out nine batters and yielding two runs (one earned) on four hits and four walks. Mariners manager Dan Wilson hasn't outlined his plans for the rotation beyond this weekend, so Castillo could need another positive showing in Detroit to avoid falling back into a piggyback arrangement with Miller or shifting into a full-time bullpen role.
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Mariners' Luis Castillo: Snags extra-inning win
Castillo (2-5) allowed two runs (one earned) on two hits and two walks with three strikeouts over five innings of relief, earning the win despite taking a blown save Sunday versus the Diamondbacks.
Castillo couldn't hold the 1-0 lead in the sixth inning after Bryce Miller's five frames of one-hit ball. This was still a positive showing for Castillo, who has given up just four runs (three earned) over 11.1 innings while adding a 13:6 K:BB over his last three appearances. He has a 5.53 ERA, 1.45 WHIP and 56:22 K:BB across 55.1 innings through 12 outings (10 starts) this year. The Mariners' fifth spot in the rotation is set to come up again on the road versus the Tigers -- if the team continues to deploy a tandem, Castillo and Miller would likely share another game despite the pitchers' discomfort with the ongoing arrangement.
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Mariners' Luis Castillo: Working behind Miller on Sunday
Castillo is slated to work out of the bullpen and will piggyback starter Bryce Miller during Sunday's game against the Diamondbacks in Seattle, Adam Jude of The Seattle Times reports.
Though both Castillo and Miller have expressed a reluctance to being used in a piggyback arrangement, the two pitchers will nonetheless operate in a tandem for a third consecutive turn through the rotation. The setup worked well the last time out Monday in Sacramento, with Castillo starting the game and delivering one of his better efforts of the season, as he struck out six and allowed just two hits and two walks over four scoreless frames. Miller followed with five innings of two-run ball and was credited with the win, but Castillo should have better odds of factoring into the decision Sunday while he and Miller are used in the opposite order. The Mariners will reassess their rotation plans after Sunday's contest, and Castillo may need another strong showing against Arizona to ensure that he avoids moving into a full-time relief role.
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Mariners' Luis Castillo: Excellent as opener
Castillo allowed two hits and issued two walks while striking out six batters over four scoreless innings in a no-decision against the Athletics on Monday.
After struggling mightily as a traditional starter this season, Castillo was deployed out of the bullpen for the first time in his career in his previous appearance May 19. The veteran righty was then moved back into a starting role Monday, but the plan all along was to pair him with Bryce Miller. Castillo ended up thriving with that setup, holding the A's to just two hits while racking up 12 whiffs and six punchouts over four frames. He was pulled after 68 pitches in favor of Miller, who fared well himself in closing out the contest by giving up two runs over five innings. It remains to be seen how Seattle will use Castillo going forward, but he made a case to remain a starter -- at least as part of a tandem -- with his performance Monday. Of course, it will dampen his fantasy value considerably if he's limited to fewer than five innings and 70 pitches as he was against the A's.
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Mariners' Luis Castillo: Starting in pairing with Miller
Mariners manager Dan Wilson said that Castillo will start Monday's game against the Athletics in Sacramento and will be used as part of a tandem with Bryce Miller, Ryan Divish of The Seattle Times reports.
In his last appearance Tuesday against the White Sox, Castillo pitched in relief for the first time in his 10-year big-league career, covering 2.1 frames and allowing two earned runs behind Miller, who started and worked the first 5.2 innings. The two will be deployed in the opposite order for the upcoming turn through the rotation, and while Castillo should have a higher innings floor as a starter, his poor form of late could result in Wilson leaning on Miller to handle the larger share of the pitching workload. Though the Mariners are taking a fluid approach to the back end of the rotation, Castillo may need a positive showing against the Athletics to avoid a demotion into a more traditional bullpen role. He'll head into Monday's start with a 6.41 ERA and 1.55 WHIP on the season, with both ratios being the worst marks of his career by a considerable margin.
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Mariners' Luis Castillo: Struggles persist in relief outing
Castillo (1-5) allowed two runs on a hit, two walks and a hit batsman while striking out four over 2.1 innings, taking the loss Tuesday versus the White Sox.
Castillo was fine through two innings, but manager Dan Wilson left him in for the start of the ninth. That ended up being a mistake, and Andres Munoz failed to stop the White Sox's rally after coming in for mop-up duty. Castillo's poor relief outing stands in contrast to a superb start from Bryce Miller, who appears to have bumped Castillo out of the rotation. Castillo is at a 6.41 ERA, 1.55 WHIP and 47:18 K:BB through 46.1 innings over 10 outings (nine starts). It'll likely take an injury to another pitcher for Castillo to get back in the rotation at this point.
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Mariners' Luis Castillo: Piggybacking Miller on Tuesday
Castillo is slated to piggyback starting pitcher Bryce Miller during Tuesday's game against the White Sox, Adam Jude of The Seattle Times reports.
Castillo will be making the first relief appearance of his MLB career Tuesday after going 1-4 with a 6.34 ERA and 1.57 WHIP through his first nine starts of the season. Since Miller covered 5.1 innings in his 2026 Mariners debut last week in Houston following his return from the injured list, manager Dan Wilson is likely to let Miller work as long as he's effective against the White Sox. With that in mind, Castillo's innings projection for Tuesday is highly variable, and how he and Miller both perform could determine how Seattle sets up its rotation moving forward. If Miller comes through with a strong outing Tuesday, he'll likely draw another start the next time the fifth spot in the rotation comes up, while Castillo could be thrust into a more flexible bullpen role on a longer-term basis.
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Mariners' Luis Castillo: Finally gets into win column
Castillo (1-4) earned the win Thursday against the Astros, allowing three runs on four hits and three walks in 5.2 innings. He struck out six.
Castillo was working on a bounce-back start Thursday, giving up a lone run over his first five frames, but the Astros got to him for two more runs in the sixth inning to make his line more middling. The Mariners might have left the 33-year-old right-hander in the game for a bit too long considering that the hurler tossed a season-high 108 pitches. Castillo has now yielded at least three runs in three straight outings and six of his last eight, posting a disappointing 6.34 ERA, 1.57 WHIP and 43:16 K:BB over 44 innings in 2026. He's tentatively lined up to piggyback with Bryce Miller early next week versus the White Sox, which would mark Castillo's first career relief appearance if he works as the secondary pitcher.
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Mariners' Luis Castillo: Tagged with another loss
Castillo (0-4) was tagged with the loss Saturday against the White Sox, allowing four runs on five hits across four frames. He struck out six.
This loss against Chicago ballooned Castillo's woeful ERA to 6.57 across 38.1 innings in eight outings this year. He's lost his past three starts and has given up at least four runs in each of those games. Castillo has been confirmed to start Thursday against the Astros, but according to Ryan Divish of The Seattle Times, after that the Mariners plan to piggyback him with Bryce Miller in the rematch series against the White Sox that runs May 18-20.
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Mariners' Luis Castillo: Could get bumped from rotation
The Mariners could remove Castillo from the rotation when Bryce Miller (oblique) returns next week, Adam Jude of The Seattle Times reports.
It's just one option the team is mulling, as Miller and Emerson Hancock are also being considered for the bullpen or piggyback roles. It would be an easy decision to bump Castillo from the rotation if it were based purely on performance, as he's posted a 6.29 ERA, 1.66 WHIP and 31:13 K:BB over 34.1 innings in his first seven starts. However, Castillo has never pitched in relief at the major-league level, while Miller and Hancock both have. A six-man rotation is also under consideration. Castillo will start Saturday in Chicago against the White Sox in what could be his final opportunity to convince the Mariners he should remain in the rotation.
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Player Bio
| HT/WT: 6-2, 200 lbs |
| Birthplace: Bani, Dominican Republic |
| Age: 33 |
| Experience: 9 |
| Bats/Throws: R, R |