Castillo (2-2) picked up the win Sunday at Toronto, yielding three runs on 10 hits and two walks over five innings. He struck out five.
Castillo walked away with his 75th career win despite giving up double-digit hits -- including four doubles -- for the first time since April 2, 2024. The veteran right-hander labored through 102 pitches and handed the game off to his bullpen, which allowed just one additional hit. Castillo has not been sharp to open the season, pitching to a 4.44 ERA, 1.59 WHIP and 23:12 K:BB across 26.1 innings. He currently lines up for a home start against the Marlins next weekend.
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Mariners' Luis Castillo: Struggles in Cincinnati
Rotowire
Castillo (1-2) yielded six runs on seven hits and four walks over 4.1 innings Tuesday, striking out three and taking a loss against the Reds.
Castillo was uncharacteristically bad Tuesday, coughing up a pair of runs through four innings before the Reds piled on four more in the fifth. He threw 54 of 95 pitches for strikes and has failed to complete six innings in three of his first four starts. Tuesday's rough outing was the first time he gave up more than five earned runs in a game since Aug. 4, 2023. Castillo's 2025 ERA ballooned to 4.22 with an 18:10 K:BB through 21.1 innings. His next start is lined up to be in Toronto this weekend.
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Mariners' Luis Castillo: Labors through five shutout innings
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Castillo didn't factor into the decision Tuesday against the Astros after allowing five hits and two walks in five scoreless innings, striking out six.
Castillo notably escaped a bases-loaded jam in the fourth inning by getting Cam Smith to fly out. The right-hander scattered five singles and was also able to register his first scoreless start of the campaign Tuesday, but he did labor his way through five frames while needing 102 pitches to complete the outing. Castillo features a 2.12 ERA, 1.12 WHIP and 15:6 K:BB over his first three starts (17 innings) of 2025, and he's tentatively set to face his former Reds team at hitter-friendly Great American Ball Park early next week.
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Mariners' Luis Castillo: Earns first win of 2025
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Castillo (1-1) came away with the win Wednesday against the Tigers. He allowed two runs on five hits and two walks while striking out five across seven innings.
Castillo limited the Tigers to three baserunners across the first four innings, but his shutout efforts were lost in the fifth frame when he gave up a solo homer to Trey Sweeney. Castillo gave up a second run in the same frame on a fielder's choice, but he managed to pitch into the seventh inning without much trouble and came away with the quality start and win. Castillo has started the season with a 3.00 ERA, 1.00 WHIP and 9:4 K:BB across 12 innings. He'll look for a second straight win in his next start, which is tentatively slated for next week against the Astros at home.
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Mariners' Luis Castillo: Saddled with loss
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Castillo (0-1) was charged with the loss Friday against the Athletics after giving up two runs on three hits and two walks while striking out four over five innings.
Castillo kept the A's off the board until the fifth inning, when a Lawrence Butler double followed by a Brent Rooker home run put his team in a 2-0 hole. Unfortunately for Castillo, the Athletics' pitching staff was able to keep the Mariners off the board for the whole game, so the 32-year-old will end up starting the year with a loss despite a respectable effort on his part. He'll hope for a bit more run support when the Tigers come to town next week.
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Mariners' Luis Castillo: Solid spring continues Saturday
Rotowire
Castillo didn't factor into the decision in Saturday's Cactus League game against San Diego after giving up two runs on five hits over 4.2 innings. He struck out four.
After throwing three scoreless innings Saturday, Castillo watched Gavin Sheets go deep for one run and Connor Joe hit a double to plate another in the fourth frame. While Castillo has struggled with the long ball this spring, allowing three homers across 12.2 innings, he encouragingly hasn't yielded greater than two runs in any of his four Cactus League starts. The 32-year-old right-hander will have the benefit of working about half of his outings in 2025 at the pitcher-friendly T-Mobile Park, where Castillo boasts a 2.89 ERA and 1.00 WHIP with 279 strikeouts through 233.2 innings (39 starts) since joining the Mariners in 2022.
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Mariners' Luis Castillo: Not ready for Houston series
Rotowire
Castillo (hamstring) is making good progress and has thrown off a mound, but he's not expected to return from the 15-day injured list for the Mariners' three-game series in Houston that begins Monday, Shannon Drayer of SeattleSports.com reports.
Seattle has confirmed Bryce Miller as its starter for Monday's series opener in Houston, and Logan Gilbert and George Kirby are considered "most likely" to go Tuesday and Wednesday, respectively. That means Castillo likely won't return from the IL when first eligible, but he's still very much in the mix to make a final regular-season start against Oakland later in the week. Castillo currently sits with a 3.64 ERA and 1.17 WHIP in 175.1 innings this season.
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Mariners' Luis Castillo: On track with progress
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Castillo appears to be making good progress in his recovery from a hamstring strain, and the Mariners remain cautiously optimistic that he'll be activated from the 15-day injured list when first eligible Monday, MLB.com reports. "Progressing as he should be," manager Dan Wilson said. "I don't think there's any expected date, right now, of his return, but progressing as he has. I know Luis is very diligent about getting his work in and trying to get healthy, and I think as far as we know right now, he's doing well."
The veteran right-hander has been sidelined since Sept. 8, when he suffered the strain while ducking out of the way of a throw on a stolen-base attempt. Castillo's ability to make at least one more start down the stretch could be critical for the Mariners, who remain in contention for an American League wild-card spot entering the season's final week. Castillo has once again proven a consistent workhorse of Seattle's rotation this season, going 11-12 with a 3.64 ERA and 1.17 WHIP across 175.1 innings over 30 starts.
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Mariners' Luis Castillo: Out with hamstring strain
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Castillo was placed on the 15-day injured list Tuesday due to a Grade 2 left hamstring strain, Ryan Divish of The Seattle Times reports.
The right-hander already received a platelet-rich-plasma injection and hopes to be available after spending the 15-day minimum on the shelf. Even in a best-case scenario, Castillo will only be able to rejoin the Mariners for one or maybe two starts before the end of the regular season. Seattle is currently three games back of the final AL wild-card spot and is tied with two other teams, and the playoff positioning could affect how quickly the organization elects to bring Castillo back.
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Mariners' Luis Castillo: Set for MRI on Monday
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Castillo (hamstring) will undergo an MRI on his left hamstring on Monday in Seattle, Daniel Kramer of MLB.com reports.
Castillo left Sunday's start against the Cardinals as a result of a left hamstring strain. He will now receive additional imaging on the leg to determine the severity of the injury. Manager Dan Wilson did not speculate if he believed that Castillo will be able to make his next scheduled start or not, but more information on Castillo's status will come Monday.
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Mariners' Luis Castillo: Departs with hamstring strain
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Castillo was removed from Sunday's game against the Cardinals due to a left hamstring strain, Shannon Drayer of SeattleSports.com reports.
The right-hander had a good chance to pick up a win Sunday as Seattle scored seven runs across the first two frames, but Castillo was lifted due to the hamstring injury after giving up two runs across three innings. The severity of the issue isn't known, and it's unclear if the 31-year-old will be able to make his next turn through the rotation next weekend versus the Rangers.
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Mariners' Luis Castillo: Little run support Tuesday
Rotowire
Castillo did not factor into the decision in Tuesday's loss to the Athletics, allowing two runs on four hits and a walk while striking out five over seven innings.
Castillo only allowed four hits but two of them went for home runs, one by Lawrence Butler in the first inning and another by Seth Brown in the fourth. Castillo has now allowed nine home runs over his last five starts, though Tuesday was his first time reaching seven innings since July 19 and his first quality start since Aug. 11. The 31-year-old righty is putting together another strong campaign, yet the Mariners are 14-15 in his starts, partially due to the fact that they've scored two runs or fewer in 11 of Castillo's outings. For the year, he owns a 3.60 ERA, 1.15 WHIP and 172:46 K:BB in 172.1 innings and lines up to face the Cardinals in St. Louis over the weekend.
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Mariners' Luis Castillo: Gives up three more homers
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Castillo allowed five runs on six hits and struck out nine without walking a batter over six innings in a no-decision versus the Giants on Friday.
Castillo was in line for the loss until the Mariners rallied to tie the game in the eighth inning. He gave up a season-high three homers Friday, and the five runs against also matched his season high. He had allowed multiple homers just four times over his first 25 starts this year, but has now done so in back-to-back outings. Castillo is at a 3.66 ERA, 1.16 WHIP and 163:43 K:BB through 159.2 innings over 27 outings this year. He's projected for a home start versus the Rays next week.
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Mariners' Luis Castillo: Allows two homers in loss
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Castillo (10-12) took the loss against the Pirates on Saturday, allowing four runs on five hits and three walks with six strikeouts over 5.1 innings.
Castillo allowed four runs, including two homers, while generating 11 swinging strikes on 103 pitches. He broke a streak of seven consecutive quality starts and surrendered multiple home runs for the first time since June 20. On the season, the 31-year-old owns a 3.51 ERA, 1.17 WHIP and 154:43 K:BB across 153.2 innings and lines up for a home matchup with the Giants next week.
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Mariners' Luis Castillo: Another dominant effort in win
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Castillo (10-11) got the win over the Mets on Sunday, allowing one run on four hits and two walks while striking out nine over six innings.
Castillo was engaged in a pitcher's duel with Luis Severino heading into the fifth inning before the Mariners were able to provide him with some cushion on the scoreboard. The lone run against him came on a sixth-inning solo home run by Jeff McNeil. Castillo racked up nine strikeouts for a second straight start and went on a run in the game during which he struck out five consecutive batters. He's now recorded seven straight quality starts while allowing one or fewer runs four times. Castillo owns a 3.40 ERA, 1.16 WHIP and 148:40 K:BB in 148.1 innings and will look to keep rolling in a matchup with the Pirates over the weekend his next time on the mound.
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Mariners' Luis Castillo: Nine strikeouts in loss
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Castillo (9-11) took the loss Tuesday against the Tigers, allowing three runs on eight hits and no walks while striking out nine over six innings.
Castillo kept the Tigers off the board until they plated the first run of the game in the fourth. Two more runs were scored against him in the fifth after the Tigers compiled four singles in the inning. It was the fourth time this season he's given up at least eight hits in a game, though only one hit went for extra bases. He also tied his season high in strikeouts and posted his sixth straight quality start. Castillo has been one of the most consistent pitchers in all of baseball this season, posting a 3.48 ERA, 1.17 WHIP and 139:38 K:BB in 142.1 innings this year. He lines up to face the Mets on Sunday to complete a two-start week.
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Mariners' Luis Castillo: Another quality start
Rotowire
Castillo (9-10) picked up the win Tuesday against Boston, allowing three runs on six hits and a walk across six innings. He struck out four.
Castillo delivered his fifth consecutive quality start and landed his third win during that stretch. All three runs attributed to Castillo came in the third inning when Rafael Devers lifted a three-run home run. While Castillo's K/9 has dropped from 10.0 to 8.6 this season, he's still been highly effective, posting a 3.43 ERA and 1.16 WHIP in 136.1 innings. He's tentatively lined up to make his next start Tuesday against the Tigers.
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Mariners' Luis Castillo: Tosses six scoreless frames
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Castillo allowed five hits and issued two walks while striking out seven batters over six scoreless innings in a no-decision against the Angels on Wednesday.
Castillo induced a modest nine whiffs, but he still managed to tally a healthy seven punchouts. The veteran hurler has tossed exactly six scoreless frames in two of his past three outings, and he's recorded a quality start in four straight appearances. Castillo's strikeout numbers are down this season -- he's on pace to record fewer punchouts than innings pitched for just the second time in his career -- but he's otherwise been reliable, posting a 3.38 ERA, 1.16 WHIP and 126:37 K:BB over 130.1 innings.
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Mariners' Luis Castillo: Hurls six shutout innings in win
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Castillo (8-9) picked up the win over the Angels on Thursday, allowing four hits and two walks over six scoreless innings while striking out five.
Castillo allowed baserunners in each of the first three innings but managed to work his way out of trouble on each occasion. The right-hander threw first-pitch strikes to 17 of 23 batters and induced 12 whiffs on the night to earn his second consecutive win. Castillo has now gone at least six innings in back-to-back outings after previously failing to do so in three straight. However, he's also issued multiple free passes in four of his last five starts.
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Mariners' Luis Castillo: Strong in seventh win
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Castillo (7-9) allowed a run on two hits and two walks while striking out eight over 6.2 innings to earn the win Friday over the Blue Jays.
Castillo earned his first quality start in four outings with this impressive performance. The only run on his line was a solo home run by Kevin Kiermaier in the sixth inning. Castillo is now at a 3.72 ERA, 1.18 WHIP and 111:32 K:BB through 111.1 innings over 19 starts this season. He's projected to make his next start on the road versus the Angels in a favorable matchup.
