Seattle Mariners: Breaking News, Rumors & Highlights

Cubs’ perfect trade offer for Mariners’ Luis Castillo

The Chicago Cubs are quietly shaping up to be one of the more interesting trade deadline buyers in the National League and their rotation needs make a run at Seattle Mariners right-hander Luis Castillo a logical move.

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The Morning Bark

The Quiz of the Day

Jeff Passan Nailed the Mariners’ Cleanest Trade Deadline Solution

There was no reason to overthink this one. It’s no secret by now that the Mariners are in need of a right-handed bat. But more importantly, it’s what kind of right-handed bat they need.

Philadelphia Phillies News / Yardbarker Quizzes

The 'Active MLB XBH leaders' quiz

How many of the active MLB players to rack up at least 500 extra base hits in their career can you name in five minutes?

The 'MLB All-Star Game MVPs' quiz

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Luis Castillo News / MLB on ClutchPoints / July 9

Mariners rumors: Why Luis Castillo is most likely starter trade despite return to form

It has been an up-and-down season for Mariners starter Luis Castillo, as he has not displayed the dominance he once had. But there has been improvement in recent outings. Despite his improvement, he may still be traded away, according to Ken Rosenthal of The Athletic.

MLB News / Yardbarker

25 MLB players most likely to be traded by the deadline

The MLB Trade Deadline has been quieter in recent years, in part due to playoff expansion, but 2026 is shaping up to be a more exciting one with several big names.

Bryce Miller News / Field Level Media / July 9

For M's to reach playoffs, Bryce Miller must be at his best; Marlins up next

The Seattle Mariners -- the only active MLB franchise never to play in a World Series -- may have a shot to end that drought this year. After all, the Mariners are in first place in the American League West, and they are coming off a 2025 season during which they reached the American League Championship Series.

Jerry Dipoto News / Seattle Mariners on SI / July 9

Jerry Dipoto’s Deadline Comment Could Signal a Different Kind of Mariners Trade

Jerry Dipoto didn’t exactly bury the lede. He didn’t name a specific player or team, but when he started talking about buyer-to-buyer trades with the trade deadline approaching, we should probably read between the lines. This didn’t sound like Dipoto’s traditional word salad.

Brendan Donovan News / Seattle Mariners on SI / July 8

Mariners Should Plan to Finish Season Without Brendan Donovan After Latest Rehab Detour

It’s been a common topic that the Mariners don’t need to do anything drastic with the trade deadline approaching. They could look at the injured list, point at the names coming back, and convince themselves that the best additions were internal.

Seattle Mariners News / Lookout Landing / July 8

Mariners Play Boring Game in Boring Stadium, Lose 2-0

I don’t want to write this recap. The Mariners lost 2-0 to the Marlins on Wednesday. It was a very boring game. George Kirby pitched well, in the way that George Kirby often pitches well, but not in the way that he pitched so well as to be newsworthy.

Brendan Donovan News / Athlon Sports / July 8

Mariners Receive Brendan Donovan News After 44 Straight Missed Games

The Seattle Mariners have stumbled so far in the 2026 MLB season. Heading into play Wednesday they are 47-45, good enough for first place in a weak American League West.

Stuart Fairchild News / MLB Trade Rumors / July 8

Mariners Sign Stuart Fairchild To Minor League Deal

The Mariners added outfielder Stuart Fairchild on a minor league contract after he rejected an outright assignment with the Guardians earlier this week and instead opted for free agency.

Athletics News / Yardbarker

25 MLB players who could be first-time All-Stars in 2026

Being named to the Midsummer Classic is one of the biggest honors for MLB players. These 25 players have a chance to make their first All-Star appearance in 2026 based on their first-half performances.

Dominic Canzone News / Seattle Mariners on SI / July 8

Mariners Finally Wise Up and Hand Dominic Canzone the Everyday Role He Earned

Dominic Canzone made sure he hit his way into a bigger role. No matter how long the Mariners front office wanted to keep playing the platoon game, Canzone kept producing a body of evidence that forced the M’s hand.

Randy Arozarena News / Seattle Mariners on SI / July 8

Randy Arozarena’s Viral Grand Slam Trot Shows the Mariners Must Embrace the Chaos

Randy Arozarena hit a grand slam, on the Fourth of July, against the Toronto Blue Jays, turned the bases into his own personal stage, and somehow Talkin’ Baseball found a way to ask whether he did too much.

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Seattle Mariners News / Seattle Mariners on SI / July 7

Mariners Sign Seattle Native After Guardians DFA and Taiwan League Rumors

The Mariners didn’t go out and land a huge name here. But it’s at least another right-handed bat. Seattle has signed outfielder Stuart Fairchild and assigned him to Triple-A Tacoma, giving the organization another affordable right-handed option with speed, defensive versatility and a little bit of a hometown flavor to spice it up.

Seattle Mariners News / Lookout Landing / July 7

Mariners fail to take advantage of opportunities, lose 6-5

The most frustrating thing about tonight’s 6-5 extra-innings loss: it was a winnable game, if just a few things had gone differently. But the mistakes compounded for the Mariners, ultimately delivering a loss to open up the Florida leg of their road trip – always a tough road trip for the Mariners, who haven’t won a series in Miami since 2011.

Seattle Mariners News / Minor League Baseball on SI / July 6

Mariners Prospects Lazaro Montes, Michael Arroyo Move One Step Closer to Majors

Two of the Seattle Mariners' top prospects are set to be promoted to the next level in the minor leagues. Lazaro Montes and Michael Arroyo are expected to join the Triple-A Tacoma Rainiers, the Mariners announced on Monday.

Seattle Mariners News / Field Level Media / July 5

Rotation in order, Mariners send Emerson Hancock to mound vs. Blue Jays

Had the Seattle Mariners stuck with their plan to piggyback their starting pitchers on Saturday, there might have been an uproar at T-Mobile Park. Logan Gilbert allowed one runner in 7 1/3 innings, and the Mariners hit three homers -- including a grand slam by All-Star Randy Arozarena -- in an 11-0 rout of the Toronto Blue Jays.

Cal Raleigh News / Yardbarker / July 4

Big Dumper to Big Slumper: Is Mariners' Cal Raleigh a one-hit wonder?

Widely known as the ''Big Dumper'' who crushed a career-high 60 home runs and was the 2025 Home Run Derby champion, Cal Raleigh has significantly underperformed this season. Is he a one-hit wonder?

Comparing the struggles of Vladimir Guerrero Jr. and Cal Raleigh in 2026

Five MLB players in the AL who deserve contract extensions

Dodgers hit with alarming Shohei Ohtani prediction

Mets' Steve Cohen makes big admission, promise amid woeful season