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
Rotowire
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
Rotowire
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: Labors early in loss
Rotowire
Castillo (3-3) allowed five runs on seven hits and two walks while striking out three over five innings to take the loss versus the Blue Jays on Friday.
Castillo had a brutal first inning, and he struggled again in the third. He was able to settle in a bit and finished with 94 pitches (60 strikes) in five frames, but the damage was already done. He had allowed just one run over 12 innings across his previous two starts, so this was a big step back. Castillo is now at a 3.95 ERA, 1.38 WHIP and 33:18 K:BB across 43.1 innings through eight starts this season. The right-hander's next start is projected to be at home versus the Yankees.
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Mariners' Luis Castillo: Logs another quality start
Rotowire
Castillo pitched six innings in a no-decision against Texas on Saturday, allowing one run on four hits and two walks while striking out two batters.
Though he induced just two whiffs and fanned a season-low two batters, Castillo was sharp against the Rangers, as he didn't allow any extra-base hits and threw 58 of 88 pitches for strikes. Since allowing nine runs over 9.1 innings in a two-start span in mid-April, the veteran hurler has bounced back with two straight quality starts during which he has yielded just one run over 12 frames. The excellent pair of outings has brought Castillo's ERA back down to 3.29, though his 30:16 K:BB over 38.1 innings is mediocre.
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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: Allows 10 hits in win
Rotowire
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.
Mariners' Luis Castillo: Labors through five shutout innings
Rotowire
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.
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
Rotowire
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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