Luis Castillo Fantasy Stats

Seattle Mariners right-hander Luis Castillo entered his team's game against the Boston Red Sox on Friday night in the sixth inning and struggled, allowing five runs (four earned) on seven hits across four innings of work. The 33-year-old has generally pitched better since being moved from the rotation into a hybrid starter/reliever role, as he had allowed just six earned runs with 22 strikeouts across 23 innings (five appearances) since the switch leading into Friday. However, Castillo's overall line for the year remains ugly. Across 70 2/3 innings, he's recorded a 2-6 record with a 5.22 ERA, 1.40 WHIP, and 69 strikeouts. At this point, Castillo appears to be the clear odd man out in a Seattle rotation that includes Bryan Woo, Logan Gilbert, George Kirby, Bryce Miller, and Emerson Hancock. Barring an injury to one of the Mariners' top arms, Castillo is likely safe to drop in most fantasy formats.

Seattle Mariners starting pitcher Luis Castillo is set to make the start during Monday's game against the Athletics. Mariners manager Dan Wilson confirmed that Castillo will start and Bryce Miller will work behind him in a piggyback role. The Mariners tried this strategy on Tuesday, but Miller started, and Castillo worked the final few innings. Castillo tossed 2.1 innings, allowing two earned runs in the first relief appearance of his big league career. The Mariners will reverse the order in which they pitch together and hope for better results from Castillo. The veteran right-hander holds a 6.41 ERA and 1.55 WHIP, so fantasy managers shouldn't put much faith in him right now. Miller will likely pitch the bulk of the innings, so Castillo won't be a recommended fantasy option.

Seattle Mariners right-hander Luis Castillo is slated to work as a piggyback reliever behind Mariners starter Bryce Miller on Tuesday against the Chicago White Sox, per Adam Jude of The Seattle Times. While Castillo has been one of the more dependable starting pitchers in baseball for nearly a decade, this move to the bullpen is a result of his brutal start to 2026. Across 44 innings (nine starts) so far this year, Castillo has recorded a 1-4 record with a 6.34 ERA, 1.57 WHIP, and 43 strikeouts. Miller opened 2026 on the injured list due to an oblique injury, but the combination of his return and Mariners right-hander Emerson Hancock's breakout may make it difficult for Castillo to rejoin the rotation. Even if the veteran gets another chance, his career-worst 13.4% K-BB rate could be an indicator that his time as a fantasy-relevant starting pitcher has come to a close.

Seattle Mariners starting pitchers Luis Castillo and Bryce Miller will piggyback each other after a full turn through the rotation. Miller is set to return from the Injured List on Wednesday after missing the start of the season due to an oblique issue. The Mariners plan to use a six-man rotation for one full turn through, but will shake it up after that. The Mariners don't want to disrespect Castillo, who has been a starter throughout his big league career. However, Castillo has been horrible with a 6.29 ERA through seven starts this season. The hope is that putting Castillo and Miller together will end up offering better results for both pitchers. Between the two, Miller is the more desirable fantasy option, but he won't be an ideal streaming choice if he doesn't pitch deep into games.

Seattle Mariners starting pitcher Luis Castillo could end up as the odd man out in the starting rotation. Fellow starter Bryce Miller (oblique) is set to return from the Injured List next week. The Mariners will need to make a big decision with their rotation once Miller is back in the mix. They could roll with a six-man rotation; if not, Castillo or Emerson Hancock would likely be shifted to a bullpen role for now. Castillo has never pitched out of the bullpen, with all 250 of his big league appearances coming as starts. However, he has been unusable in the rotation this season. Castillo owns a 6.29 ERA, 1.66 WHIP, and a 31:13 K:BB ratio through seven starts. Hancock has been the much more effective starter and has earned the right to remain in the rotation. A short stint in the bullpen might be good for Castillo to hopefully turn around his season.

With Seattle Mariners right-hander Bryce Miller (oblique) on the verge of being reinstated from the 15-day injured list to make his 2026 season debut at some point next week, one of right-handers Luis Castillo or Emerson Hancock, could be in danger of being bumped from the starting rotation to the bullpen, according to Adam Jude of The Seattle Times. The Mariners could also elect to go with a six-man rotation for the time being. Jude writes that one thing is certain: Hancock has cemented a place on the major-league roster. He's been one of the best starters in the American League so far this year, posting a team-best 2.59 ERA and 46:6 K:BB in 41 2/3 innings pitched. Another possibility is that Castillo is paired with Miller in a piggyback role. The 33-year-old Castillo is most in danger of a demotion to a relief role after starting 2026 0-3 with an ugly 6.29 ERA in seven starts. It's easier said than done, though, as he's never pitched out of the bullpen and is a respected leader in the clubhouse. Castillo is also still owed $24 million next year with a vesting option for the 2028 season.

Seattle Mariners right-hander Luis Castillo will make his first start of the 2026 season in the team's fifth game on Monday, March 30, against the New York Yankees at T-Mobile Park, according to Adam Jude of The Seattle Times. Fantasy managers shouldn't read anything into the fact that Castillo will start the fifth game of the regular season after he pitched in the team's Cactus League finale on Monday. The 33-year-old veteran will have a difficult matchup to kick things off, though, after struggling in spring training. Castillo allowed 14 runs (13 earned) on 23 hits (five home runs) while walking four and striking out 13 in 15 innings pitched over five starts. Spring statistics should always be taken with a grain of salt. Castillo has had ERAs under 4.00 in three straight seasons and has also made at least 30 starts for fantasy managers over that span. He's no ace, but Castillo's fantasy floor is pretty high, especially when starting at pitcher-friendly T-Mobile Park.

Seattle Mariners starting pitcher Luis Castillo has long been one of MLB's most durable and reliable right-handers. The 33-year-old started to show some signs of decline in 2025, but still posted solid numbers overall. Across 180 2/3 innings (32 starts), Castillo posted an 11-8 record with a 3.54 ERA, 1.18 WHIP, and 162 strikeouts. Castillo's 21.7% strikeout rate was by far the lowest of his career, and he also allowed the highest barrel (10.4%) and hard-hit (46.4%) of his nine-year MLB tenure. Castillo has the benefit of making his home starts in one of the game's most pitcher-friendly environments in Seattle. In 2025, he posted a 2.60 ERA and 0.97 WHIP across 100 1/3 innings at home compared to a 4.71 ERA and 1.46 WHIP in 80 1/3 innings on the road. Castillo's days of being a high-end fantasy starting pitcher are likely behind him, but he's still a savvy veteran who should be usable in all of his home starts. He checks in as RotoBaller's SP49 heading into 2026.

Seattle Mariners starting pitcher Luis Castillo will draw the start for Sunday's Game 2 of the ALDS against the Detroit Tigers. The Mariners are in need of a big win here after dropping the opener. It won't be easy versus left-hander Tarik Skubal, but Castillo has looked solid lately. Castillo posted a 2.45 ERA in the month of September. The right-hander gave up three earned runs over his last four starts during the regular season. This is looking like a potential pitcher's duel between two aces on Sunday.

Seattle Mariners starting pitcher Luis Castillo spun seven shutout innings against the Pirates on Saturday night, allowing only two hits and no walks while picking up eight strikeouts. He didn't get much run support but made it stand up in the 1-0 victory. Castillo earned the win to improve to 5-5 on the season with a 3.31 ERA, 3.90 FIP, and 1.22 WHIP. He has allowed three runs or fewer in four of his last five starts, with 27 strikeouts in 30 innings and four quality starts. He doesn't have the elite strikeout numbers from his prime, but he still can deliver strong outings in favorable matchups like this one, especially when he's working at pitcher-friendly T-Mobile Park. He'll get one more start before the All-Star break in a much tougher matchup on Friday night in Detroit.