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Mariners' Luis Castillo: Working as bulk reliever Tuesday
Rotowire
Castillo is expected to work as the primary reliever Tuesday against the White Sox, Adam Jude of The Seattle Times reports.
Bryce Miller will draw the start and will likely work as long as he's effective, and then it'll be up to Castillo to take the mound. This will mark the right-hander's first relief appearance of his MLB career. It remains to be seen whether Castillo will remain in the bullpen going forward, but for the time being, it appears he's the odd man out of the starting rotation following Miller's return from the injured list.
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Mariners' Luis Castillo: Finally gets into win column
Rotowire
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
Rotowire
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
Rotowire
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.
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.
Castillo (0-2) took the loss Monday, allowing seven runs on seven hits and two walks over five innings against Minnesota. He struck out three.
Castillo worked a clean first inning but struggled from there, allowing four runs in the third inning, highlighted by a three-run homer from Kody Clemens. Known for his consistency with a career 3.61 ERA and just one full season above 4.00, Castillo is off to a rough start in 2026, posting a 6.35 ERA and 1.73 WHIP with opponents hitting .317 across 28.1 innings (six starts). He'll look to get back on track in his next outing, which is tentatively scheduled for Sunday against Kansas City.
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.
Mariners' Luis Castillo: Tagged with loss Thursday
Rotowire
Castillo (0-1) was tagged with the loss Thursday against the Padres, allowing four runs (one earned) on seven hits and three walks across 5.1 innings. He struck out three.
Castillo came just two outs away from notching a quality start, but the veteran right-hander continues to struggle. After opening the season with six scoreless innings and seven Ks in a no-decision March 30, Castillo has given up 15 runs (11 earned) on 23 hits with a 10:5 K:BB across 12.1 frames in April. He's scheduled to make his next start next week at home against the A's.
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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