The Seattle Mariners were, unsurprisingly, one of the busier teams at the trade deadline this season. While they're typically more passive in the offseason, the front office tends to do its best work around the halfway point of the regular season.
With this year marked by even more aggressive decisions than last year, let's take a look at how each of the new (or returning) faces have looked since joining and rank them by their potential impact.
Ranking the Mariners' trade deadline additions from worst to best
3. Caleb Ferguson, LHP
Seattle was known to be one of many teams searching for bullpen support ahead of last week's deadline. With the big-market teams likely driving up the price for the marquee names like Jhoan Durán and Ryan Helsley, the Mariners picked up a lesser known but still effective arm in Caleb Ferguson in exchange for pitching prospect Jeter Martinez.
The biggest draw for the organization was the need for another lefty reliever. Gabe Speier has been left to hold down the southpaw fort while Tayler Saucedo has spent nearly the entire season with Triple-A Tacoma. Speier publicly expressed his excitement over Ferguson joining the squad and so far, both lefties have been great. Ferguson has made three appearances for his new team and has pitched 2.2 innings, and has yet to give up a baserunner.
2. Josh Naylor, 1B
The first big move made by the team, Naylor's acquisition was a sign of things to come. Of course, he would later be joined by his corner infield partner from the Diamondbacks. But if he had arrived alone, it may have already been enough to push the team to new heights. He came with a promise to plug one of the biggest holes in the roster that has sandbagged the squad since Opening Day.
Josh Naylor slugs his first @Mariners home run! pic.twitter.com/c2NoGfSpIZ
— MLB (@MLB) July 29, 2025
In the 10 games he has had with Seattle thus far, it has been a bit of a slow start. He's slashing .211/.268/.316 with just two extra-base hits. However, it's a small sample and he should warm up in no time.
1. Eugenio Suárez, 3B
The blockbuster trade that put the Mariners back on the map was seen as a major transaction by some. To others, it was simply a reunion. After the Mariners failed to fill the void left by his departure, he's now back with the team and the vibes have never been better.
Eugenio Suárez reintroduces himself to Seattle 😤 pic.twitter.com/A6e5lmY2xw
— MLB (@MLB) August 1, 2025
He has yet to have his first big moment since returning, and his numbers overall are quite bad in the four games he's played. But like Naylor, he'll take some time to warm up.
Besides, his team has his back while he's figuring things out. After a critical series win against the Texas Rangers, the Mariners are just 3.0 games behind the Houston Astros for the AL West lead and their chance to make the playoffs per FanGraphs stands at nearly 81 percent.
