Castillo (0-2) took the loss Tuesday against Cleveland, allowing four runs on 10 hits and a walk over 5.2 innings. He struck out seven.

EDGE Analysis

Castillo's strikeout total was the only positive from Tuesday's loss as he surrendered double-digit hits for just the third time in his career. He was tagged by Bo Naylor for a two-run homer in the fourth frame. Castillo will look to find the elusive first win of 2024 next time out, tentatively lined up for Monday against the Blue Jays.

Castillo (0-1) took the loss against Boston on Thursday, allowing four runs on six hits and two walks while striking out five batters over five innings.

EDGE Analysis

Castillo struck out two batters in a 1-2-3 first inning, but he didn't record any clean frames thereafter. The right-hander was stung by Rafael Devers' two-run homer in the third and followed by giving up a run in each of the next two frames. On a positive note, Castillo worked up to 91 pitches in his season debut and averaged 95.8 mph on his fastball, so he seems to be in good form despite the rough outing. He'll look to bounce back next week, as he is projected to make his next start at home against Cleveland.

Castillo allowed two earned runs on three hits and two walks over 5.1 innings in a Cactus League spilt-squad tie with the Brewers on Friday. He struck out nine.

EDGE Analysis

Castillo was tagged for an RBI double by Jake Bauers and a run-scoring single by Joey Wiemer in the fourth inning, but he was otherwise busy overpowering most of the other hitters put in front of him. The right-hander put together a successful spring that saw him post a 2-1 record, 2.95 ERA and 22:6 K:BB across 18.1 innings, and he'll be on the hill for Seattle in an Opening Day matchup against the Red Sox on Thursday.

Manager Scott Servais said Monday that Castillo will start the Mariners' March 28 season opener versus the Red Sox at T-Mobile Park, Ryan Divish of The Seattle Times reports.

EDGE Analysis

The Mariners have better choices than most teams to take the ball Opening Day, but Castillo always loomed as the obvious option. The 31-year-old right-hander posted a 3.34 ERA and 219:56 K:BB over 197 innings covering 33 starts for Seattle in 2023.

Castillo, who fired a couple of 96-mph fastballs during his Cactus League debut Monday against the Reds, is encouraged he has that level of velocity early in camp, Daniel Kramer of MLB.com reports. "It's telling me that I'm healthy," Castillo said. "We're going to continue to be in the same routine, and hopefully that velocity will keep going up."

EDGE Analysis

Castillo notably opened spring training a year ago throwing his four-seamer in the high 80s, so the increase is certainly noteworthy. The veteran right-hander, who fell just one win short of tying his career high of 15 victories last season, will once again helm the Mariners' rotation and limited Cincinnati to a walk over two hitless innings in his spring debut. Castillo plans to continue relying heavily on his fastball in 2024, considering hitters mustered just a .165 average and .384 slugging percentage against it while swinging and missing 33 percent of the time in 2023.

Castillo (14-9) took the loss Saturday, giving up four runs on five hits and five walks over 2.2 innings as the Mariners were downed 6-1 by the Rangers. He struck out four.

EDGE Analysis

The right-hander picked the worst possible time to have his shortest outing of the season, as the loss eliminated the M's from the postseason. Castillo got the hook after 86 pitches (52 strikes), and his control deserted him in September -- he issued multiple free passes in five of six starts on the month, leading to a 4.96 ERA and 38:18 K:BB through 32.2 innings. He also came up just short of his first 200-inning campaign, finishing with a career-high 197 innings over 33 starts. Castillo still has four years left on the $108 million contract extension he signed last September, and the 30-year-old should anchor the Seattle rotation once again in 2024.

Castillo (14-8) allowed five runs on eight hits and a walk while striking out eight over six innings, taking the loss Monday versus the Astros.

EDGE Analysis

Castillo gave up three runs in the second inning and then allowed solo shots to Yordan Alvarez in the third and Kyle Tucker in the sixth. Meanwhile, the Mariners mustered only three hits and a walk in the contest, leaving Castillo with lackluster run support. The loss was his first since July 14 against the Tigers, and he'd won eight of his 12 starts since that game. He's now at a 3.20 ERA, 1.06 WHIP and 215:51 K:BB through 194.1 innings through 32 starts this year. He's tentatively projected to make his last start of the regular season at home versus the Rangers this weekend.

Castillo (14-7) allowed two runs on five hits and three walks while striking out eight over seven innings to earn the win Tuesday over the Athletics.

EDGE Analysis

Castillo earned his fifth quality start in his last six outings with a solid performance Tuesday. It took the Athletics until the seventh inning to get on the board, and the Mariners' lead was never in any real danger. Castillo now has a 3.06 ERA, 1.05 WHIP and 207:50 K:BB through 188.1 innings through 31 starts this season. He's lined up for a critical home start versus the Astros early next week as the Mariners continue to battle for the AL West lead.

Castillo (13-7) earned the win Wednesday, allowing two runs on three hits and three walks over six innings in a 3-2 victory over the Angels. He struck out eight.

EDGE Analysis

Castillo's now picked up wins in seven of his last nine starts, with his most recent loss coming on July 14. He's up to 199 strikeouts on the campaign, leaving him poised to top the 200 mark for the second time in his seven-year career. Castillo sports a 3.08 ERA with a 1.04 WHIP through 30 starts (181.1 innings) this season. He'll look to keep rolling in his next outing, currently scheduled for early next week in Oakland.

Castillo (12-7) earned the win Thursday, allowing four hits and four walks over six scoreless innings against the Rays. He struck out eight.

EDGE Analysis

Castillo wasn't particularly efficient Thursday, issuing four walks and allowing at least one baserunner in all but one of his six innings. However, the 30-year-old ace worked around the traffic and held Tampa Bay scoreless to win his sixth consecutive decision. During that eight-start span, Castillo has posted a 3.24 ERA, 1.06 WHIP and 49:12 K:BB across 50 innings. His next start is expected to be at home versus the Angels early next week.