Mariners' Luis Castillo: Picks up win in one-sided victory
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Castillo (6-5) earned the win Friday, allowing three runs on six hits and two walks over five innings while striking out six in the 12-3 victory over the Tigers.
Castillo shined early, yielding just one earned run through the first five innings before running into trouble opening the sixth, allowing back-to-back hits and another run before being removed with a runner on third. The 32-year-old entered the matchup coming off his best start of the season and has now posted a 3.60 ERA with 33 strikeouts and 11 walks over his last six outings.
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Mariners' Luis Castillo: Delivers best outing of 2025
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Castillo (5-5) picked up the win Saturday against the Pirates, striking out eight and giving up just two hits and no walks across seven scoreless innings.
The eight punchouts are a season high for Castillo, who got back in the win column for the first time since May 19 against the White Sox. The veteran right-hander has seen his strikeout numbers take a dip in 2025 with a career-low 7.6 K/9, but he's still been plenty effective through 18 starts with a 3.31 ERA and 1.22 WHIP over 103.1 innings.
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Mariners' Luis Castillo: Solid in no-decision
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Castillo didn't factor into the decision Sunday against Texas, allowing one run on seven hits and two walks with four strikeouts over six innings.
Castillo pulled himself out of a rough patch Sunday, snaring a quality start and not allowing a home run. The 32-year-old had allowed 16 runs (14 earned) in 22 innings over his previous four starts. He gave up eight home runs during that stretch after having yielded merely four round trippers in his first 12 starts. On the year, Castillo owns a 3.55 ERA, and he's scheduled to face the Pirates next time out.
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Mariners' Luis Castillo: Allows five runs Tuesday
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Castillo allowed five runs on seven hits and two walks while striking out three over five innings in Tuesday's win over the Twins. He did not factor into the decision.
Castillo was staked a five-run lead in the third inning and gave it all right back. Kody Clemens took him deep in the third before the Twins would tack on four more runs in the fourth. Castillo has given up a home run in four consecutive outings and has allowed at least seven hits in three of his last six starts. Castillo is winless since May 19 and will look to change that this weekend against the Rangers.
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Mariners' Luis Castillo: Turns in quality start
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Castillo allowed two runs on three hits and three walks while striking out seven over six innings in a no-decision Friday versus the Guardians.
Castillo was able to limit the damage to back-to-back solo home runs by Nolan Jones and Steven Kwan in the third inning. After allowing just four homers in his first 12 starts of the year, Castillo has given up five long balls over his last two outings. On the positive side, Friday's effort was his eighth quality start, five of which have come over his last six games. Castillo has a 3.29 ERA, 1.27 WHIP and 67:26 K:BB through 79.1 innings this season. The veteran right-hander is projected to make his next start at home versus the Red Sox.
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Mariners' Luis Castillo: Tagged for three homers
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Castillo (4-4) allowed six runs (four earned) on eight hits and struck out five without walking a batter over five innings, taking the loss Saturday versus the Angels.
Castillo was able to limit the damage, as all three home runs he allowed were solo shots. However, the Angels' tying rally in the third inning yielded two unearned runs, and the Mariners failed to bounce back effectively after that. Prior to Saturday, Castillo had seemingly rounded into form with four straight quality starts, allowing just four runs over 25 innings in that stretch. He's now at a 3.31 ERA, 1.30 WHIP and 60:23 K:BB over 73.1 innings through 13 starts, and he's given up seven homers this year. The 32-year-old is projected to make his next start at home versus the Guardians.
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Mariners' Luis Castillo: Blanks Twins in no-decision
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Castillo didn't factor into the decision Sunday against Minnesota, allowing four hits and two walks with five strikeouts over six scoreless innings.
No runs were scored until the seventh inning of Sunday's contest, leaving Castillo without the victory despite the excellent outing. The 32-year-old has now logged four consecutive quality starts, and he owns a 1.44 ERA and a 22:5 K:BB during that stretch. While his strikeout rate is down from 9.0 K/9 in 2024 to 7.2 K/9 in 2025, Castillo holds a 3.03 ERA, which would be his best since 2022. He's expected to pitch next weekend against the Angels.
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Mariners' Luis Castillo: Delivers quality start
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Castillo did not factor in the decision during Sunday's loss to Houston. He allowed three runs on nine hits and a walk over six innings while striking out six.
Castillo coughed up a pair of runs in the third inning and one more in the sixth. He recorded his sixth quality start of the year and third in a row, but it wasn't a very efficient one. He threw a season-high 114 pitches (72 strikes) and worked around multiple threats. Castillo generated 14 whiffs, including eight with his fastball that averaged 96.4 mph. He's sporting a 3.32 ERA with a 50:21 K:BB through 62.1 frames. Castillo is lined up to face the Twins at home next weekend.
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Mariners' Luis Castillo: Cruises to easy win
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Castillo (4-3) yielded three hits over seven shutout frames while striking out five batters and picking up a win against the White Sox on Monday
Castillo was dominant in picking up his first win since April 26. He allowed just one runner to reach scoring position and retired the final 14 batters he faced. Castillo threw 64 of 94 pitches for strikes and did not issue a free pass after walking at least two batters in each of his first nine appearances. He's given up two or fewer runs in eight of his 10 starts this season but has completed at least seven innings just twice. He'll carry a 3.20 ERA into his next matchup, which is projected to be in Houston this weekend.
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Mariners' Luis Castillo: Turns in quality start
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Castillo allowed a run on six hits and two walks while striking out six over six innings in a no-decision versus the Yankees on Wednesday.
Castillo wasn't at his sharpest but still kept the Yankees off the board until Jasson Dominguez's RBI double in the sixth inning. This was Castillo's fourth quality start of the season, three of which have come over his last four outings. The six strikeouts matched his season high, but he also continued the trend of walking at least two batters in every start so far. He's posted a 3.65 ERA, 1.38 WHIP and 39:20 K:BB across 49.1 innings through nine starts in 2025. Castillo is projected for a much more favorable matchup on the road versus the White Sox next week.
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Mariners' Luis Castillo: Fires six scoreless frames
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Castillo (3-2) earned the win against the Marlins on Saturday after giving up one hit and two walks over six scoreless innings. He struck out five.
After giving up 10 hits to Toronto in his previous start, Castillo limited Miami to a third-inning single to secure his second consecutive victory. It's a small sample size of six starts, but the right-hander's average fastball velocity of 94.9 mph, and a 7.8 K/9 this season would be the lowest of his big-league career. Still, Castillo has been mostly effective early in 2025 with a 3.62 ERA, 1.39 WHIP and 28:14 K:BB across 32.1 innings.
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Mariners' Luis Castillo: Struggles in Cincinnati
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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: 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
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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: 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.
