Mariners' Luis Castillo: Yields one run in no-decision
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Castillo did not factor into Sunday's decision against the Tigers, allowing one run on two hits and one walk while striking out five across 5.2 innings.
Castillo had worked behind Bryce Miller in each of his three prior outings, but the former was on the mound for the start of Sunday's series finale. Castillo limited the Tigers to just three baserunners across five-plus innings while inducing 12 whiffs, and he reached 100 pitches for the third time this season. He now sits at a 5.16 ERA and 1.36 WHIP across 61 innings, and his next appearance is slated for next weekend on the road against the Nationals.
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Mariners' Luis Castillo: Receiving start Sunday
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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
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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
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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
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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: Struggles persist in relief outing
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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
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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: Tagged with another loss
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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: Takes another loss
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Castillo (0-3) allowed four runs on six hits, two walks and a hit-by-pitch while striking out five over six innings to take the loss Sunday versus the Royals.
Castillo was doing fine until the fourth inning, when he allowed four straight batters to reach base to open the inning. Three of them came around to score, and the Royals tacked on an extra run in the sixth. Castillo has allowed at least four runs in five of his seven starts this season, though this is the third time he's allowed four earned runs. He has a 6.29 ERA, 1.66 WHIP and 31:13 K:BB through 34.1 innings. Until Castillo is able to limit baserunners better, he is likely to continue having trouble preventing runs. His next start is projected to be on the road versus the White Sox.
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Mariners' Luis Castillo: Fans six in no-decision
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Castillo tossed five innings against the Athletics on Tuesday, allowing two runs on five hits and two walks while striking out six batters.
Castillo gave up a run in the first inning and another in the fourth but kept Seattle in the contest throughout his time in the game. The right-hander wasn't very efficient, however, as he needed 95 pitches to complete five frames. That was partly because he had his swing-and-miss stuff working -- Castillo recorded 14 whiffs, and his six punchouts were his second most through five starts so far this season. The veteran hurler is still looking for his first victory, which he'll try to notch in what's projected to be a matchup versus Minnesota on the road his next time out.
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Mariners' Luis Castillo: Ineffective again Sunday
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Castillo allowed seven runs on 10 hits and one walk while striking out three batters over 3.1 innings in a no-decision against Houston on Saturday.
The Mariners gave Castillo a two-run lead in the first inning, but the veteran hurler fell behind when Taylor Trammell cleared the bases with a three-run double in the second. Castillo gave up three more runs in the third and another in the fourth before being pulled with one out in the latter frame. After tossing six scoreless innings against the Yankees in his first start of the campaign, Castillo has surrendered 11 runs (10 earned) over seven frames across his past two outings. He'll try to get back on track in his next start, which lines up to be a road outing in San Diego.
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Mariners' Luis Castillo: Struggles in no-decision
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Castillo did not factor into the decision Sunday against the Angels, allowing four runs (three earned) on six hits and one walk while striking out four over 3.2 innings.
Castillo couldn't find a rhythm in this one, allowing at least two baserunners in every inning he worked and exiting before completing four frames for the first time since 2024. The right-hander ran into trouble immediately, allowing a leadoff double to Zach Neto before Jorge Soler brought him home with an RBI single, and the outing didn't improve much from there. Unlike his dominant Opening Day outing in which he tossed six scoreless innings with seven strikeouts, Castillo failed to fool hitters Sunday and was consistently pitching under pressure. The 33-year-old will look to bounce back in his next scheduled start against Houston, though it presents a tough test against one of the league's most productive offenses early in 2026.
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Mariners' Luis Castillo: Strong finish to spring slate
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Castillo allowed one run on four hits and a walk while striking out five across five innings in Monday's matchup with the Padres.
Castillo finished Cactus League play on a high note, allowing three runs over nine innings in his final two outings. It's certainly an encouraging development after the right-hander struggled to a 27.00 ERA in his first three appearances (six innings). Castillo, who's posted a sub-4.00 ERA in each of his last seven seasons, made a team-high 32 regular-season starts in 2025, finishing with a 3.54 ERA, 1.18 WHIP and 162:46 K:BB across 180.2 innings.
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Mariners' Luis Castillo: Short outing in ALCS
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Castillo (1-1) allowed three earned runs on five hits and one walk while striking out one across 2.1 innings to take the loss in Game 4 of the ALCS on Thursday.
Castillo got through two innings unscathed, but he allowed five of the first six hitters he faced in the third frame to reach base before being pulled. This was Castillo's first stumble of the postseason, as he had previously thrown six scoreless innings across two appearances in the ALDS. He has a less impressive 5:5 K:BB, but he has largely been a reliable arm for Seattle.
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Mariners' Luis Castillo: Bounces back in ninth win
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Castillo (9-8) earned the win over Atlanta on Sunday, allowing one run on four hits and no walks across six innings. He struck out six.
It was a much-needed outing for Castillo, who earned his first win since July 28 -- he'd struggled to a 10.06 ERA in his previous four starts (17 innings). Overall, Castillo's ERA sits at 3.85 on the year with a 1.27 WHIP and 144:44 K:BB through 29 starts (161.1 innings). Castillo will look to build on Saturday's effort his next time out, currently lined up for next week against the Angels.
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Mariners' Luis Castillo: Skid continues Monday
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Castillo (8-8) allowed five runs on six hits and a walk while striking out five over four innings to take the loss versus the Rays on Monday.
Castillo was held under the five-inning mark for the third time in his last four starts. In that span, he's surrendered 19 runs over 17 innings, including six home runs, one of which came off the bat of Nick Fortes in the second inning of Monday's contest. Castillo is also winless in his last six outings, though he's taken just two losses in that span. For the season, he's now at a 3.94 ERA, 1.29 WHIP and 138:44 K:BB through 155.1 innings over 28 starts. He'll look to get back on track over the weekend in a road start at Atlanta.
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Mariners' Luis Castillo: Ambushed early in no-decision
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Castillo did not factor into the decision Tuesday, allowing five runs on five hits and three walks over five innings in a 7-6 loss against San Diego. He struck out six.
Castillo ran into immediate trouble Tuesday, surrendering all five of his earned runs in the first inning, punctuated by a Ramon Laureano grand slam. The 32-year-old hurler has hit a rough patch, pitching to a 5.45 ERA and 1.51 WHIP over 36.1 innings in his past seven starts. He's lined up to next take the mound Monday at Tampa Bay.
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Mariners' Luis Castillo: Settles for no-decision Friday
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Castillo didn't factor into the decision in Friday's 3-2 win over the Rays, giving up two runs on five hits over seven innings. He struck out five without walking a batter.
All the damage off the veteran righty came on solo shots by Brandon Lowe in the first inning and Junior Caminero in the sixth, but all of Seattle's offense came on a three-run blast by Cal Raleigh in the eighth. Castillo delivered his 14th quality start of the year on 99 pitches (72 strikes), and he's allowed three earned runs or fewer in eight straight trips to the mound, posting a 2.25 ERA, 1.02 WHIP and 45:7 K:BB through 48 innings over that span. He'll look to get back in the win column in his next outing, which is scheduled to come on the road next weekend against the Mets.
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Mariners' Luis Castillo: Labors in no-decision
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Castillo did not factor into the decision in Saturday's 6-4 extra-innings loss to the Rangers, allowing two runs on four hits and one walk with four strikeouts over 4.1 innings.
Castillo allowed both of his runs in the third inning and failed to complete five frames for just the second time in 23 starts, throwing only 51 of 87 pitches for strikes. Still, the veteran has now surrendered three earned runs or fewer in seven straight outings, a stretch that includes four wins and four quality starts. He'll take a 3.22 ERA, 1.21 WHIP and 115:37 K:BB across 131.1 innings into a home matchup with the Rays next weekend.
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Mariners' Luis Castillo: Falls to Milwaukee
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Castillo (7-6) took the loss Wednesday against the Brewers, allowing six runs (three earned) on 10 hits over five innings. He struck out seven.
The 10 hits allowed matched a season high for Castillo, who would take his first loss since June 18 -- the right-hander had pitched to a stellar 1.46 ERA in four starts (24.2 innings) prior to Wednesday. Overall, Castillo sports a 3.30 ERA with a 1.24 WHIP and 107:36 K:BB over 21 starts (120 innings) this season. He'll look to get back on track in his next outing, currently scheduled for next week against the A's.
