The Seattle Mariners see a path to the 2025 MLB postseason, and they sure acted on it before the trade deadline passed at 3 p.m. Thursday afternoon.
Drayer: What adding Suárez means for Seattle Mariners’ lineup
The 57-52 Mariners made a splash early to get an All-Star hitter from the Arizona Diamondbacks. And a week later they made another splash… to get an All-Star hitter from the Arizona Diamondbacks.
And that wasn’t all the M’s did, because they also added a new arm to a bullpen that has struggled to protect leads this season.
Next up, a 53-game sprint for a Mariners team starting with a four-game series at 6:40 p.m. Thursday against the Texas Rangers – the same team Seattle is tied with for the American League’s third and final wild card to the playoffs. At the same time, Seattle now has a much deeper lineup to go after the AL West crown, where a banged-up Houston Astros team holds a five-game lead.
With the Mariners’ trade deadline dealings final, here’s a look at every move they made.
July 24
• Seattle Mariners get: 1B Josh Naylor
• Arizona Diamondbacks get: LHP Brandyn Garcia and RHP Ashton Izzi
The Mariners broke the ice ahead of the trade deadline, making the first significant move after the MLB All-Star break by acquiring a new first baseman.
While the 28-year-old Naylor has been a slugger in the past (31 home runs and 108 RBIs during an All-Star 2024 campaign for Cleveland), he has more of a track record for making contact and getting on base while playing sufficient defense. And as M’s fans quickly learned, he has no problem stealing a base when he sees an opportunity.
Despite ranking in the third percentile in sprint speed in MLB (per Statcast), he has a career-high 15 stolen bases already this season and made team history by becoming the first Mariners player with four steals in his first four games with the team.
Entering Thursday’s homestand opener against the Texas Rangers, Naylor owns a .288 average, .356 on-base percentage and .798 OPS with 12 homers, 19 doubles and 60 RBIs.
To get Naylor, who will be a free agent after this season, the Mariners parted with a pair of promising prospects who didn’t rank in the upper echelon of their farm system. Garcia made his MLB debut just days ahead of the trade, while Izzi has spent all of 2025 in High-A.
July 30
• Seattle Mariners get: LHP Caleb Ferguson
• Pittsburgh Pirates get: RHP Jeter Martinez
Seattle added a left-handed reliever in Ferguson, who joins Gabe Speier as southpaws in the M’s bullpen.
Another player who will hit free agency after this year, the 29-year-old Ferguson is a seven-year MLB veteran who has been enjoying one of his better seasons. In 45 appearances for the Pirates, he has a 3.74 ERA and 1.085 WHIP. And while he doesn’t rack up many strikeouts (just 34 in 43 1/3 innings), he’s one of the best in baseball at producing weak contact.
The 19-year-old Martinez, who has spent this season with Single-A Modesto, throws a fastball that reaches the upper 90s but struggles with command.
July 31
• Seattle Mariners get: 3B Eugenio Suárez
• Arizona Diamondbacks get: 1B Tyler Locklear, RHP Hunter Cranton, RHP Juan Burgos
The Mariners won the big door price, reuniting with two-time All-Star Suárez, who is fifth in MLB with 36 homers and tied with teammate Cal Raleigh for the lead with 87 RBIs. Suárez was ranked last week by ESPN as the No. 1 player expected to move before the trade deadline. Less than two years after trading Suárez to the Diamondbacks, Seattle brings the good vibes back to T-Mobile Park.
It was still a costly price for Suárez, who is set to be a free agent after this season, but it didn’t require the Mariners to part with any of their prospects ranked in the top 100.
Locklear, who was ranked in the Mariners’ top 10 by MLB Pipeline, is the headliner for Arizona, becoming the Diamondbacks’ new No. 6 prospect. The 24-year-old VCU product has had a big year with Triple-A Tacoma, hitting .316 with 19 homers, 82 RBIs and a .942 OPS in 98 games.
The 25-year-old Burgos appeared in four games as a rookie for the M’s earlier this year, while Cranton was a third-round 2024 MLB Draft pick by Seattle out of Kansas who has a 1.13 ERA in eight relief appearances at High-A this year.
Seattle Mariners trade deadline coverage
• Eugenio Suárez surprised M’s by catching team flight to Seattle
• Passan: How Josh Naylor gives the Mariners an edge
• Mariners’ Naylor add get ESPN’s best grade for early trade deadline moves
• Naylor has provided Mariners two surprises
• What the Seattle Mariners said about trade for Josh Naylor
