Seattle Mariners News

Seattle Mariners rookie left-hander Kade Anderson (forearm) had X-rays come back negative after he was hit by a comebacker on his left forearm in his start on Saturday against the division-rival Los Angeles Angels, according to Daniel Kramer of MLB.com. Anderson and the Mariners avoided a significant scare in Anderson's final start of what has been a stellar debut season in the professional ranks. Before leaving after 3 1/3 innings of work at T-Mobile Park, Anderson did not allow a run on four hits while walking just one and striking out four to lower his season ERA to 3.79. The 22-year-old former third overall pick from LSU was as dominant as they come in the minors in 2026 before being called up to join Seattle's big-league starting rotation late in the year. In his seven starts for the M's, Anderson went 2-2 with a 3.79 ERA, 1.23 WHIP, and 32 strikeouts in 35 2/3 innings pitched. He dominated at Double-A Arkansas, posting a 1.06 ERA, 0.64 WHIP, and 135:13 K:BB in 18 starts over 93 1/3 frames. Anderson is one of the best young arms in all of baseball and should have a rotation spot locked up to begin the 2027 campaign.

Seattle Mariners relief pitcher Andres Munoz (knee) was placed on the 15-day Injured List on Friday, Ryan Divish reports. Munoz hasn't pitched since Sunday and now goes to the shelf due to right knee inflammation. His inconsistent 2026 season will now come to an end with a few games left in the regular season. He'll finish the season with a 4.24 ERA, 1.22 WHIP, and an 89/24 K/BB ratio with 28 saves across 57.2 innings of work. The expectation is that Jose A. Ferrer and Seranthony Dominguez will work in save situations over the final few days of the regular season. Fantasy managers should expect Munoz to be back in the closer role and fully healthy for the start of next season.

Across 182 innings (31 starts) in 2026, Seattle Mariners starting pitcher Logan Gilbert has recorded a 12-11 record with a 3.81 ERA, 1.10 WHIP, and 197 strikeouts. While Gilbert has still been a very useful pitcher for fantasy managers, he hasn't been quite as dominant this season as he has been in his peak years. After posting a 32.3% strikeout rate in 2025, Gilbert's strikeout rate has fallen to 26.7% in 2026. The 29-year-old's numbers have taken a considerable hit lately, as he's posted a 6.65 ERA across 21 2/3 innings in September. Surrendering the long ball has been a major issue for Gilbert in the second half of the season. Across 56 1/3 innings (10 starts) since the beginning of August, Gilbert has allowed 14 home runs (2.20 HR/9). Heading into his final scheduled start of 2026 against the Los Angeles Angels on Sunday, fantasy managers may want to temper expectations for the usually dependable Gilbert.

Seattle Mariners closer Andres Munoz (knee) "should be ok" and could be available to his team on Tuesday night after undergoing an MRI on his injured knee, per Shannon Drayer of Seattle Sports 710. Munoz was pulled from his most recent appearance on Sunday after tweaking his right knee, but he appears to have avoided serious injury. It's been a disappointing year overall for the 27-year-old, who has recorded a 4.24 ERA, 1.22 WHIP, 89 strikeouts, and 28 saves across 57 1/3 innings (61 games). Munoz has struggled with home runs (1.41 HR/9) and has blown a career-high 10 saves. However, the hard-throwing right-hander is still averaging 99.7 miles per hour on his fastball and has logged an elite 37.1% strikeout rate. Heading into 2027, Munoz could be an excellent buy-low candidate for fantasy managers.

Seattle Mariners pitching prospect Ryan Sloan spent all season at Double-A Arkansas and showed off why he is a highly regarded prospect for the Mariners. Sloan started 22 games for the Arkansas Travelers and compiled a 4-4 record with 128 strikeouts in 101 1/3 innings with a 3.73 ERA and 1.13 WHIP. At age 20, Sloan had a nice season at the Double-A level and displayed why he is ranked as the No. 2 prospect in the Seattle system. He has a 60-grade fastball and changeup combination with a 55-grade secondary pitch in his slider. Sloan could use another year in the minors potentially but also could push the Mariners to promote him to the major leagues. It will be interesting to see how his development progresses next year. He could be worth a draft selection next year with an outside shot of making his MLB debut at some point in 2027.

Seattle Mariners closer Andres Munoz (knee) tweaked his right knee during his team's 2-1 win over the Colorado Rockies on Sunday and will undergo imaging on Monday, per Ryan Divish of the Seattle Times. Munoz allowed a hit, a walk, and an earned run across 1/3 of an inning before being removed from the game. It's been a disappointing year for Munoz, who has pitched to a 4.24 ERA and 1.23 WHIP with 10 blown saves across 57 1/3 innings (61 games). Munoz's underlying metrics suggest he's pitched better than his results, as he's logged an outstanding 37.6% strikeout rate and a 3.06 FIP. However, Munoz has allowed an elevated batting average on balls in play (.319) and HR/9 (1.41), and could now be looking at missed time. If Munoz is sidelined, Mariners left-hander Jose A. Ferrer and right-hander Seranthony Dominguez could both see save opportunities for Seattle.

Across 492 plate appearances in 2026, Seattle Mariners outfielder Dominic Canzone is hitting .257/.327/.481 with 22 home runs, 69 RBI, 55 runs scored, and two stolen bases. The lefty slugger opened the year as a big-side platoon bat, but he's held his own against left-handed pitching this season with an .833 OPS. As a result, Canzone has worked his way into everyday playing time in the heart of the Mariners lineup. The 29-year-old's underlying contact metrics support his production, as he's posted a 12.1% barrel rate and a 44.8% hard-hit rate. He's also limited his swing-and-miss, logging a manageable 21.5% strikeout rate. In leagues where he's not already rostered, Canzone profiles as a steady source of power and run production for fantasy managers to target on the waiver wire.

Seattle Mariners closer Andres Munoz has had a down year in 2026, recording a 4.25 ERA and a 1.18 WHIP with 86 strikeouts across 55 innings (58 games). Munoz's underlying numbers remain very strong, as he's averaged 99.7 miles per hour on his fastball and has posted an elite 37.4% strikeout rate. However, the 27-year-old's HR/9 has skyrocketed to 1.31, and he's blown a career-worst 10 saves. Between his issues with command (10% walk rate) and his penchant for giving up the long ball, Munoz has been prone to blow-up outings in 2026. His most recent appearance on Sunday was one such outing, as he allowed two earned runs across 2/3 of an inning to take the loss against the Athletics. Munoz remains a must-start closer for fantasy managers, but he never quite discovered his peak form this season.

Seattle Mariners outfielder Lazaro Montes (hip) returned to his team's lineup on Tuesday, batting eighth and playing designated hitter against the Texas Rangers. Montes was sidelined by a hip injury throughout most of the weekend after crashing into the right-field wall in Seattle on Friday night. The 21-year-old made his MLB debut with the Mariners on September 1 and has logged three hits and a home run across his first 15 big-league plate appearances. Montes was having a monster year in the minors before getting the call, hitting .249 with 38 home runs, 96 RBI, 99 runs scored, and eight stolen bases across 542 plate appearances split between Double-A and Triple-A. Swing-and-miss is a major issue in his profile at the plate, but Montes holds tremendous power upside and could be a game-changer for fantasy managers down the stretch.

The Seattle Mariners are promoting top infield prospect Michael Arroyo to the major leagues prior to Sunday's game against the Athletics, according to Daniel Kramer of MLB.com. Arroyo ranked as the Mariners' No. 3 prospect in the latest MLB Pipeline farm system rankings. He was originally signed as an international free agent out of Colombia in 2022. He was promoted from Double-A to Triple-A in the middle of the 2026 season, slashing .283/.359/.471 with 18 home runs, 81 RBI, 17 steals, and 117 wRC+ between the two affiliates. He also racked up an 8.1% walk rate and a 16.4% strikeout rate in the minors. Arroyo played the left side of the infield early in his minor league career, but he has only played second base and left field in 2026. He'll make his MLB debut on Sunday afternoon, batting eighth and playing second base.

Seattle Mariners starting pitcher Kade Anderson was called up to make his MLB debut two weeks ago. His three starts since the call-up haven't been otherworldly, but he still has the strikeout upside necessary to make him an impactful starting pitcher in fantasy baseball for the final stretch of the season. Anderson has a 5.40 ERA through his three starts, but the 3.17 FIP doesn't look quite as bad. The ball-in-play metrics are solid, but we'd like to see him harness his strikeout, walk, and home run rates over a larger sample size. His 6.60 K/9 rate in the majors is essentially half of his rate from the minors this year, and his 4.20 BB/9 and 1.80 HR/9 rates are both key reasons why his ERA is so high. Getting called up midseason could be the main reason why Anderson has been a little shaky in the majors, and we have no concerns about his ability to produce long-term. Meanwhile, in the short-term, there's still a window for him to turn things around if he can attack the strike zone and miss more bats. He's an intriguing stash in September because if he makes those corrections, he'll have a huge fantasy baseball impact. He currently ranks as the #30 starter in RotoBaller's latest rest-of-season fantasy baseball rankings.

Seattle Mariners outfield prospect Lazaro Montes (hip) is absent from the starting lineup on Saturday against the division-rival Athletics at T-Mobile Park after crashing into the outfield wall and injuring his hip on Friday night, according to MLB.com. Dominic Canzone is starting in right field and is batting in the two-hole against A's left-hander Jeffrey Springs. Montes is considered day-to-day with soreness in his left hip and appears to have avoided a significant injury, so the young outfielder could be back in action as early as Sunday's series finale against the A's. The Mariners' No. 5 prospect, per MLB Pipeline, put up big numbers in 123 minor-league games between Double-A Arkansas and Triple-A Tacoma this year before his call-up recently, slashing .249/.369/.558 with a .928 OPS, 38 home runs, 96 RBI, 99 runs scored, and eight stolen bases in 542 plate appearances. For Montes' raw power alone, he is a worthy fantasy baseball stash in deep-mixed leagues. In his first three MLB games, the 21-year-old Cuban outfielder has gone 3-for-11 with a homer, three RBI, two runs, a walk, and four strikeouts. Montes is rostered in only 6% of Yahoo leagues.

Seattle Mariners second base/outfield prospect Michael Arroyo already has six RBI in his first four September games at Triple-A Tacoma and is continuing to show why he is one of the top prospects in the Mariners system. The Mariners No. 3 overall prospect, Arroyo is a well-rounded player with a 55-grade hit tool and 55-grade power with 50-grade speed. Between two minor league levels this season, Arroyo has a combined 18 homers and 17 stolen bases with a .286 batting average and looks like a consistent, five-category performer. As someone who can play second base or be shifted to the outfield, Arroyo has some versatility to his game. He is looking like he will be a plus fantasy contributor when he is called up to the majors, and he looks like someone the Mariners could use with his all-around game and his positive versatility.

Seattle Mariners outfield prospect Lazaro Montes (hip) exited Friday night's game early against the division-rival Athletics with soreness in his left hip, according to the team. In just his third MLB game, Montes left hobbled after crashing into the outfield wall while attempting a catch. Until we know the severity of the 21-year-old's injury, we will consider him day-to-day. Before being replaced in right field by Taylor Ward, Montes went 0-for-2 at the plate. In his first two games for the M's, the team's No. 5 prospect per MLB Pipeline went 3-for-9 with a home run, three RBI, and two runs scored. Seattle recently called up the 21-year-old Cuban outfielder in hopes that he would give the team a shot in the arm as they try to stay in the playoff race in the American League down the stretch. In 123 games (542 plate appearances) in the minors this year with Double-A Arkansas and Triple-A Tacoma, Montes hit .249/.369/.558 with a .928 OPS, 38 home runs, 96 RBI, 99 runs scored, and eight stolen bases, so he can certainly do serious damage at the dish when he is on. Because he sells out for lift and power most of the time, fantasy managers will have to put up with plenty of strikeouts. But his 6-foot-5, 250-pound frame can produce high-end power. UPDATE: MLB.com's Luke Olson reports that Montes is day-to-day.

According to Ryan Divish, Seattle Mariners relief pitcher Matt Brash (lat) will be shut down from throwing for the next eight weeks. The Mariners are doing this after a recent MRI revealed more inflammation in his lat. Brash was ramping up towards a return in late August, but unfortunately, he suffered a setback. When healthy, Brash has been a stud, but keeping him on the mound has been extremely difficult for the Mariners. He'll finish the season with a 0.54 ERA, 0.84 WHIP, and a 15/6 K/BB ratio across 20 appearances. The expectation is that the 28-year-old will be ready to go for the 2027 season.

Seattle Mariners infield/outfield prospect Michael Arroyo cooled after a hot start to his Triple-A campaign, but is heating up again for Tacoma, going 8-for-26 (.308) with a double, a triple, a home run, one stolen base, and a 3:4 BB:K over his last seven games for the Rainiers. It brings the slash line to .271/.349/.481 for the Mariners' top offensive prospect, with eight home runs and three steals in 44 games since being promoted to Triple-A in early July (18 home runs, 16 steals in 109 games including Double-A). The jump to the higher level has not fazed him, with virtually identical strikeout (16.7 percent) and walk rates (8.1 percent), along with a 10-point improvement in OPS (.830). The Mariners have aggressively promoted other top prospects this season, with Colt Emerson, Kade Anderson, and Lazaro Montes all making their debuts in 2026, and Arroyo could be next in line. With solid hit, power, and speed tools, the 21-year-old possesses a solid all-around skill set that could make him a sneaky fantasy option down the stretch if he were to get regular at-bats, making him a stash-worthy option in deeper 12+ team leagues.

Seattle Mariners right-hander Bryce Miller is set to return to the team's starting rotation following right-hander Emerson Hancock's (groin) placement on the 15-day injured list, per Daniel Kramer of MLB.com. Mariners manager Dan Wilson said on Friday that Miller was temporarily being moved into a bullpen role. However, the injury to Hancock will move Miller back into the rotation before he made a single appearance out of the pen. Across 94 innings on the year, Miller has recorded a 4-8 record with a 4.12 ERA, 1.09 WHIP, and 92 strikeouts. While the 28-year-old's overall numbers are respectable, he struggled to a 9.00 ERA across 20 innings in August. Still, Miller has posted a solid 24.6% strikeout rate while walking just 6.6% of the batters he's faced this season. His next start is likely to come on Wednesday at Fenway Park against the Boston Red Sox.

Seattle Mariners top outfield prospect Lazaro Montes is being called up to the majors, according to Francys Romero of Beisbol FR. The talented outfielder signed with the Mariners as an international free agent out of Cuba in 2022 and has quickly developed within the organization's farm system. Up until this point, Montes had split his 2026 season between Double-A and Triple-A. Through 43 games at the Triple-A level, he was slashing .267/.359/.564 with 13 home runs, an 11.6% walk rate, a 31.3% strikeout rate, and 125 wRC+. Strikeouts are evidently a concern with the 21-year-old, but he makes up for it with incredible power, slugging 38 total homers in the minors this year. There's a strong chance that he could be in the lineup for his MLB debut tomorrow against the Boston Red Sox. Regardless of whether he plays on Monday, he should earn consistent playing time in the thick of the playoff race, as the Mariners are five games back in the AL West.

According to Daniel Kramer, Seattle Mariners starting pitcher Bryce Miller is temporarily being moved to the bullpen. Mariners manager Dan Wilson confirmed the news on Friday that the struggling right-hander will shift to the pen for now. Over his last eight starts, Miller is 0-6 with a horrendous 7.19 ERA. It doesn't sound like Miller is fully healthy right now, so they might move him to the Injured List if he continues to struggle. The Mariners will go with a traditional five-man rotation with Miller getting the boot. Miller will likely pitch in low-leverage spots, which won't result in much fantasy value.

Seattle Mariners outfield prospect Lazaro Montes is still hitting with power in the minor leagues, with nine homers and 19 RBI in August with Triple-A Tacoma. This season, between Double-A Arkansas and Triple-A Tacoma, Montes has combined to hit .248 with 37 homers and 93 RBI with 96 runs scored. The power-hitting skills are elite for Montes, the No. 5 overall prospect for the Mariners. He is blessed with 65-grade power but just a 45-grade hit tool. So he will need to improve his overall batting skills before he is able to earn a promotion to the big leagues. But the Mariners could use the power that he provides, making him a tempting call-up at the end of this season. Fantasy managers will want to monitor closely how the Mariners use Montes as this season winds down.