Here's how Mariners' Trade Deadline shook out

This story was excerpted from Daniel Kramer’s Mariners Beat newsletter. To read the full newsletter, click here. And subscribe to get it regularly in your inbox.

SEATTLE -- The Trade Deadline came and went at 3 p.m. PT on Monday, and other than adding outfielder Taylor Ward from Baltimore earlier that morning, the Mariners stood pat.

The acquisition of Ward was part of two deals that Seattle orchestrated ahead of this Deadline, along with Saturday night’s more substantial trade that sent Luis Castillo to the White Sox.

Here’s a recap of the roster shuffle:

IN: OF Taylor Ward, RHP Seranthony Domínguez, OF Nolan Jones (Minors), C Boston Smith (No. 14 prospect)

OUT: RHP Luis Castillo, RHP Alex Hoppe, RHP Brock Moore (Minors) and RHP Harrison Kreiling (Minors)

It wasn’t a major haul, but it also wasn’t necessarily expected to be. This was a buyer-heavy market limited with right-handed impact bats.

The Mariners attempted to add another high-leverage reliever but ultimately did not -- and there’s a legitimate question if that could come back to hamstring them.

Last year, they were at the finish line to acquire Jhoan Duran from the Twins, but the Phillies swooped in and made a more aggressive offer at the last minute. The Mariners could have sorely used that one more power arm in the postseason.

On paper, the best match to acquire a reliever appeared to be with San Diego, a front office that Seattle has regularly done business with. The Padres had three power arms that would’ve fit nicely for the Mariners, including Jeremiah Estrada, Adrian Morejon and Mason Miller, the best closer in baseball.

None of those arms wound up moving, though, and San Diego was a buyer on Deadline Day, adding starting pitchers Casey Mize and Robbie Ray.

A few potential fits went to other contenders -- including Luke Weaver (from Mets to Pirates), Jeff Hoffman (from Blue Jays to Twins) and Antonio Senzatela (from Rockies to Brewers).

The Angels moved quite a few relievers as well -- Chase Silseth (to Rangers), Ryan Zeferjahn (to Cubs), Kirby Yates (to Pirates) -- but the Mariners have not made a trade with their division rivals since 2012.

The bigger buzz surrounding the Mariners over the weekend was among players that they ultimately did not move -- George Kirby, Emerson Hancock and Randy Arozarena. The club had been actively listening on the starters, even after trading Castillo, while Arozarena was believed to be available at one point.

But a source with knowledge of the Mariners’ plans said shortly after the Ward trade that the club intended to retain Arozarena. Hanging on to its most consistent hitter and lone All-Star in 2026 signaled that Seattle intended to salvage a playoff push. Arozarena will be a free agent at season’s end.

Ward hasn’t had much power in 2026, at least compared to his career track record, having hit 98 homers from 2022-25, including a career-high 36 with the Angels last season.

His 129-point dip in slugging percentage from last year, to .346, is the 10th-largest among 181 qualified hitters. Cal Raleigh’s is the largest, a 278-point dip from his 60-homer season.

But Ward will give the Mariners a boost elsewhere, as his .381 on-base percentage would be the highest on the team. He’ll likely be their leadoff hitter against left-handed pitchers, against whom he has a career .827 OPS. The Mariners have badly needed a boost against southpaws.

Cole Young has enjoyed success in the leadoff spot against both righties and lefties since assuming the role full-time two weeks ago. Overall, he’s hitting .337 with an .857 OPS at leadoff. It’s certainly possible that he remains atop the lineup against righties even when Brendan Donovan returns from the injured list, which the club said over the weekend should be on Tuesday.

Speaking of Donovan, he could also be a huge boost to a lineup that’s scuffled for most of his absence. When the Mariners acquired him just before Spring Training, he was viewed as a capstone piece to a roster coming off an ALCS appearance.

On the relief front, the Mariners will also get internal reinforcements via Carlos Vargas, Matt Brash and Cooper Criswell -- who are each expected to return in the coming weeks, listed in order by the soonest anticipated.

Kade Anderson, MLB Pipeline’s No. 5 overall prospect, might also be in the mix for the final stretch, now that the Deadline dust has settled. Mariners general manager Justin Hollander told 710 Seattle Sports that Anderson is “definitely in the mix” and that the club will map out a plan this week “that makes the most sense for him to impact the big league team, if there is a spot for him to do so.”

The 2026 Deadline was not nearly as splashy as ‘22 or ‘26, and it’s reasonable for fans to have wanted more -- especially in the bullpen. But the roster is in a better place than it was a few days ago, and the Mariners are just three games out of first place in the AL West with 49 games to go.