Seattle Mariners interim manager Dan Wilson said he didn't have a definitive timeline on right-hander Luis Castillo (hamstring) and if he'd be able to be activated from the 15-day injured list when he's eligible next Tuesday. "Progressing as he should be ... I think as far as we know right now, he's doing well," Wilson said. Castillo was placed on the IL on Tuesday due to a Grade 2 left-hamstring strain, but it remains to be seen if he'll be able to rejoin the team's starting rotation before the end of the 2024 regular season. He has already received a platelet-rich plasma injection. At best, Castillo might make two more starts for the Mariners the rest of the way as they look to secure a wild-card spot in the American League. The three-time All-Star hasn't been as dominant this year, but he's still been useful in all fantasy formats with a 3.64 ERA and 1.17 WHIP with 175 strikeouts and 47 walks in his 175 1/3 innings over 30 starts.

Seattle Mariners starting pitcher Luis Castillo (hamstring) has been placed on the 15-day injured list on Tuesday. Ugh, this news comes after Castillo left early during Sunday's game due to a hamstring issue. After undergoing further testing it was determined that Castillo suffered a Grade 2 hamstring strain. At this point in the season it's uncertain if Castillo will take the mound again in 2024. He was pitching well with a 3.64 ERA, 1.16 WHIP, and 175 strikeouts over 175 1/3 innings of work this season. The Mariners haven't announced who is going to take over in the starting rotation. Regardless, most fantasy managers can move on from Castillo with the playoffs starting in most formats.

Seattle Mariners right-hander Luis Castillo (hamstring) was removed from his start early on Sunday against the St. Louis Cardinals due to a left-hamstring strain. Before leaving, Castillo allowed two earned runs on five hits while walking one and striking out three in three innings of work at Busch Stadium. He will undergo an MRI exam on his hamstring on Monday when the team arrives back in Seattle, and at the very least, his next start is in jeopardy. If the 31-year-old's hamstring injury is serious enough, Castillo may not make it back for the rest of the regular season. Losing Castillo for the rest of the way would be a serious blow to Seattle's chances of catching the division-rival Astros for the American League West division lead. Castillo has gone 11-12 this year with a 3.64 ERA, a 1.17 WHIP and 175 strikeouts in 175 1/3 innings of work over his 30 starts for the M's.

Seattle Mariners starting pitcher Luis Castillo dominated the Mets on Sunday, tossing six innings of one-run ball while striking out nine. Castillo allowed just four hits and two walks in this one. The 31-year-old has been a consistent presence all year, but he's been especially good since the start of July, racking up four wins, a 2.27 ERA, a 1.03 WHIP, and 45 strikeouts in 43 IP. He seems to be finding his groove at the perfect time for both the Mariners and his fantasy owners, who should treat him as a must-start pitcher down the stretch.

Seattle Mariners starting pitcher Luis Castillo continued his strong season by picking up his eighth victory of the season in an 11-0 blowout victory against the division rival Los Angeles Angels. Castillo was not needed deep into the contest with such a big lead, but he was productive in his six innings of work. Over that span, he allowed four hits, zero runs, two walks and struck out five on the evening. The veteran entered the season with the expectation of being of the first pitchers selected in 2024 drafts and has backed up his performance this year with a 3.53 ERA and 116 strikeouts over 117 1/3 innings. The only flaw, if there is one with Castillo is that the Mariners offense could hold him back from getting more victories. Outside of that, he can safely be ranked as a top tier pitcher the rest of the way.

Seattle Mariners starting pitcher Luis Castillo (7-9) came out on top in the battle of the aces on Friday night versus Kevin Gausman and the Toronto Blue Jays, picking up the quality start in 6 2/3 innings with one run allowed on two hits and two walks with eight strikeouts in a close 2-1 victory. Castillo carried a no-hitter into the seventh inning before making his first and only mistake on a fastball right down the middle to Kevin Kiermaier, who tagged the 1-2 pitch for a solo shot over the right-field wall. The 31-year-old veteran struggled to a 5.13 ERA in June, but hopefully Friday night's outing is the sign of things turning around for the right-hander. Fantasy managers' eyes should light up when they see that Castillo's next matchup on Thursday will be against the Los Angeles Angels, whose offense has struggled mightily lately with only one run scored in their last three games.

Seattle Mariners starting pitcher Luis Castillo will start Sunday against the Twins in the series finale. With no announced starter for Sunday's game after Bryan Woo was placed on the IL, it was speculated that the Mariners would go with their recent call-up, Jhonathan Diaz. Diaz had made a start earlier this month for the Mariners, but instead, it will be Castillo. The 31-year-old has had a rough go of it lately, with just one quality start in his last four outings, but he did face the Twins once already this season with solid results. The righty went six-and-two-thirds innings, allowing three runs (two earned) on two hits and three walks while striking out seven.

Seattle Mariners starting pitcher Luis Castillo dominated the Los Angeles Angels on Sunday, pitching seven shutout innings in a 5-1 victory. Castillo allowed just two hits and three walks while striking out six. He has now allowed two or less earned runs in 10 straight starts dating back to April 14th. The 31-year-old also finally saw his ERA dip under 3 for the first time this year after this start, showing just how impressive he's been lately. He should be considered an elite pitcher in fantasy, just as he was before the season.

Seattle Mariners starting pitcher Luis Castillo put together another quality start in Tuesday's no-decision versus the division rival Houston Astros. Castillo fired six innings and allowed five hits, two runs, one walk and struck out six on the evening. Castillo had a couple rough starts to open the season, but he has been his dominant self throughout most of the season and remains a must-start every time that he is on the bump. On the season, Castillo is 4-6 with a 3.28 ERA and 1.19 WHIP over 12 starts. Next up will be a favorable matchup versus the Los Angeles Angels. Castillo should continue to be a top option for managers moving forward.

Seattle Mariners starting pitcher Luis Castillo put together a strong performance versus the Texas Rangers to pick up his second victory of the season on Thursday. Castillo tossed six innings and allowed four hits, two runs, two walks and struck out six on the evening. Castillo has steadily improved as the season has gone on and managers could put to rest any worries from his early season outings. The 31-year-old remains one of the top pitchers in the game and managers can expect to have an ace in most of his starts moving forward. Next up is a matchup versus the Atlanta Braves on Tuesday. Even against a good lineup, Castillo is pretty much a must-start.

Seattle Mariners starting pitcher Luis Castillo continued disappointing fantasy managers in Monday's 5-2 loss to the Blue Jays. Castillo pitched five innings, allowing four runs on nine hits and a walk with six strikeouts. The 31-year-old is now 0-3 with a 6.89 ERA, although he does have 18 strikeouts in 15 2/3 IP. The season is still early and Castillo has earned a long leash given his career track record, but fantasy managers were hoping for a lot more when they drafted him as an ace. Unfortunately, Castillo will have his hands full in his next projected start against a hot Cubs lineup.

Seattle Mariners Opening Day starting pitcher Luis Castillo struggled in his first game of the season on Thursday against the Boston Red Sox. Castillo pushed through five innings and allowed six hits, four runs, two walks and struck out five on the evening. The 31-year-old is coming off another strong season and managers should not be concerned as of now, despite spending a high draft pick on the right-hander. Castillo remains a top tier option with ability to rack up strikeouts and limits walks. He will look to get into the win column versus the Cleveland Guardians on Tuesday.

Seattle Mariners right-hander Luis Castillo, who was in the conversation for the American League Cy Young award for most of last year, threw 96 mph fastballs in the first inning of his Cactus League debut on Monday against the Cincinnati Reds. It was a significant rise compared to last year, when he was in the high-80s early on. It was a telling sign of Castillo's health, as he's typically a pitcher who grows slower into his velocity than most and who uses spring training to regain his feel rather than install offseason adjustments. "It's telling me that I'm healthy," Castillo said. His four-seam fastball held hitters to a .165 average and .384 slugging percentage in 2023 while generating a 33% whiff rate, an MLB-best among starters. Castillo's fastball/slider combo has made him an easy top-10 fantasy starter in Seattle.

Seattle Mariners starting pitcher Luis Castillo looked ready to go in his spring debut Monday, firing two scoreless innings in a 2-0 Cactus League win over the Reds. Castillo's fastball touched 96 MPH as he allowed no hits and a walk with a strikeout. The 31-year-old turned in another stellar season in 2023, going 14-9 with a 3.34 ERA, 1.10 WHIP, and 27.3% strikeout rate in 33 starts and 197 innings pitched. Given the turbulent pitching landscape last season and his track record, Castillo has moved up into ace fantasy consideration for 2024.

Seattle Mariners right-hander Luis Castillo will look to come up big for his team Monday when he gets the ball for a key start versus the Houston Astros. The Mariners enter Monday's contest just a half-game back of the Astros for the final Wild Card spot in the American League and are also three games back of the Texas Rangers for the top spot in the AL West. The club has the right man on the mound tonight as Castillo has worked to a 3.06 ERA and a 20.7% K-BB% across 31 starts on the season including a tidy 2.52 ERA across 96 1/3 innings at home where he will pitch tonight. The 30-year-old has allowed just four earned runs over his last three starts and 19 innings of work but will take on an Astros offense that ranks first in baseball with a .377 wOBA over the last 30 days.

Seattle Mariners starting pitcher Luis Castillo notched his 10th win of the season in Monday's 14-2 game against the White Sox. Castillo pitched seven innings, allowing one run on five hits and no walks with nine strikeouts. The 30-year-old has been a consistent higher-end fantasy starter all season long and now has a 10-7 record with a 3.15 ERA and a 10.01 K/9 rate. His next start will be another favorable matchup against the Royals.

Seattle Mariners starting pitcher Luis Castillo took a no-decision on Friday when he surrendered seven runs on 10 hits with six strikeouts and one walk over six innings in a 9-7 win over the Los Angeles Angels. Normally, you'd expect a starting pitcher to take the loss when they allow seven runs but the Mariners offense punched back in this one, giving their ace a no-decision for their effort. Castillo was victimized by the long ball in this contest, serving up a solo shot to Luis Rengifo on his first pitch of the game, a three-run homer to Mike Moustakas, and a two-run bomb to Mickey Moniak. He still managed to punch out six batters and only issued one walk but did give up a lot of hard contact. It happens. Castillo has been steady as a rock this season for Seattle so his overall stat line is still great, even with the poor effort on Friday. He'll carry a 3.21 ERA, 1.05 WHIP, and 155:34 K/BB ratio over 137 1/3 innings into his next turn against the Padres at home.

Seattle Mariners starting pitcher Luis Castillo yielded three runs on six hits and two walks over six innings with a season-high 11 strikeouts for a no-decision on Wednesday versus the Minnesota Twins. The 30-year-old was dominant at times in this one, but allowed a run during the second inning before serving up two solo shots in the fifth frame. Castillo was relieved after six, recording a quality start. The 2023 All-Star features a 3.04 ERA, 1.05 WHIP, and 133:30 K:BB in 118 1/3 innings this year. Ironically, Castillo lines up on Monday to face not only these same Twins but also Kenta Maeda once again, this time in Minnesota.

Seattle Mariners starting pitcher Luis Castillo threw seven innings of one-run ball in Friday's 10-1 victory over the Houston Astros. The 30-year-old struck out only three batters, but permitted just five hits for his sixth win of the year. Castillo tossed two scoreless opening frames before running into a bit of trouble in the third. The right-hander allowed a Chas McCormick double before an Alex Bregman single drove him in to let Houston get on the board. Seattle would swiftly retaliate with a nine-run fourth-inning bombardment, granting Castillo quite a bit of leeway. The hard-throwing righty would coast the rest of the way, hurling four more scoreless innings before his night ended during the eighth frame with 89 pitches and the game well in hand. Castillo wraps up his first half with a fine 2.85 ERA, 1.04 WHIP, and 117:28 K:BB over 107 1/3 innings this season. The 2023 All-Star figures to take the ball at some point next weekend versus the lowly Detroit Tigers offense.