The Seattle Mariners have officially unveiled their roster for Opening Day of the 2026 season, and while much of the group aligns with expectations built over the course of spring training, there are still a handful of notable developments and unexpected inclusions worth discussing. Compared to the earliest projections made when camp first opened, the final composition reflects both the team’s relatively good fortune with injuries and a few late shifts in opportunity brought about by short-term absences.
For the most part, Seattle has navigated spring training without suffering any devastating setbacks, which has allowed the organization to maintain a strong sense of continuity. However, there are still a few key contributors who will not be ready to go when the regular season begins. Starting shortstop J.P. Crawford and right-handed pitcher Bryce Miller are both slated to begin the year on the injured list.
While neither injury is considered long-term, and both players are expected to return early in April, their temporary absence has opened the door for several depth players to step into more prominent roles than initially anticipated. In addition, utility player Miles Mastrobuoni will also miss the start of the season due to injury, further reshaping the roster picture and creating additional opportunities for others to break camp with the big-league club.
Catchers
Behind the plate, the Mariners will carry Cal Raleigh and Mitch Garver as their primary catching tandem. This outcome had gradually become clear over the final stretch of spring training, as Garver emerged as the favorite to secure the backup role. He ultimately outperformed both Andrew Knizner and Jhonny Pareda in camp, solidifying his place on the roster.
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Garver’s inclusion represents a fairly straightforward roster move from a structural standpoint. In order to make room for him, the team is expected to designate Knizner for assignment, effectively swapping one veteran catcher for another.
This maneuver allows Seattle to retain organizational depth while still prioritizing the player who demonstrated the strongest performance during camp. Meanwhile, Pareda will likely begin the season at Triple-A Tacoma, positioning himself as the next option should the big-league club require additional catching support at any point.
Infielders
The infield group includes Ryan Bliss, Josh Naylor, Leo Rivas, and Cole Young. Among these names, Bliss stands out as perhaps the most surprising inclusion. Not long ago, his chances of making the Opening Day roster appeared extremely slim. His path to playing time seemed almost nonexistent, with several higher-profile prospects and established players ahead of him on the depth chart.
However, circumstances shifted in his favor. A combination of injuries to Crawford and Mastrobuoni, along with Bliss’s own strong and consistent performance throughout spring training, allowed him to carve out a spot on the roster. In a sense, it required both opportunity and execution, and Bliss capitalized on both.
His emergence came at the expense of top prospect Colt Emerson, who had been widely regarded as a potential candidate to break camp with the team. Despite showing flashes of promise during spring training, Emerson ultimately did not do enough to force the organization’s hand. His earlier optioning to the minors signaled the team’s intentions, and he will now return to Triple-A Tacoma, where he can continue his development after a brief stint there at the end of the 2025 season.
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In the meantime, Cole Young and Leo Rivas are expected to share responsibilities at shortstop in Crawford’s absence. Both players bring versatility and defensive capability, allowing the Mariners to navigate the early part of the season without their usual starter. While neither may replicate Crawford’s full impact, the combination of the two should provide a steady bridge until he returns.
Utility Players
Seattle’s collection of utility players adds another layer of flexibility to the roster. Brendan Donovan, Luke Raley, and Rob Refsnyder all fall into this category, though each brings a slightly different skill set to the table.
Donovan, who is projected as the team’s starting third baseman, is one of the most versatile players on the roster. He has experience playing virtually every position on the field, making him an invaluable asset in terms of roster flexibility. While shortstop might be a stretch for him defensively, his ability to move around the diamond ensures that the Mariners can adjust their lineup as needed without sacrificing too much stability.
Raley’s presence is equally significant, particularly given his return to full health. He is capable of handling all three outfield positions competently, which not only strengthens the team’s defensive alignment but also provides the coaching staff with more options when constructing lineups. His versatility also allows for more frequent use of designated hitter slots for players like Randy Arozarena and Rob Refsnyder, helping to balance rest and offensive production.
Refsnyder, meanwhile, presents a slightly more complicated case. Defensively, his role is less clearly defined. While he has experience across multiple infield positions, he has not regularly played most of them in recent years, with first base being his primary infield assignment since 2017. He is more naturally suited to corner outfield roles at this stage of his career. However, the Mariners appear comfortable using him in a limited capacity across different spots, particularly as a right-handed bat off the bench.
There may be some lingering concern among observers who have seen previous Mariners teams struggle with roster depth, but this iteration of the bench is considerably stronger. Refsnyder’s primary value lies in his offensive contributions, and the team’s overall versatility allows them to accommodate his defensive limitations without significant drawbacks.
Outfielders
The Mariners’ outfield unit is one of the most stable and predictable aspects of the roster. Randy Arozarena, Dominic Canzone, Victor Robles, and Julio Rodríguez will comprise the group, and there were no real surprises in this area.
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This quartet represents one of the strongest outfield alignments the franchise has had in many years. Each player brings a unique combination of skills, from Rodríguez’s superstar potential to Arozarena’s dynamic offensive presence and postseason pedigree. Canzone and Robles round out the group with solid complementary abilities, giving the Mariners both depth and balance across all three outfield positions.
Starting Rotation
The starting rotation also came together largely as expected. Logan Gilbert, George Kirby, Bryan Woo, Luis Castillo, and Emerson Hancock will make up the five-man unit to begin the season. The order reflects how the team plans to deploy its starters in the early going.
This group has been a cornerstone of the Mariners’ roster construction, and the expectation is that it will once again serve as a major strength. The temporary absence of Bryce Miller does not significantly disrupt the rotation’s overall structure, as Hancock is capable of stepping in and providing quality innings. The organization remains optimistic that Miller will return relatively soon, minimizing any long-term impact on the pitching staff.
Bullpen
The bullpen features Eduard Bazardo, Matt Brash, Cooper Criswell, José A. Ferrer, Casey Legumina, Andrés Muñoz, Gabe Speier, and Carlos Vargas. Once again, this group aligns closely with pre-spring expectations, though there are a couple of new faces worth noting.
José A. Ferrer is perhaps the most significant addition. Acquired during the offseason in a trade that involved a notable package of players, he is expected to play a key role in high-leverage situations. His ability to generate ground balls makes him a valuable asset in late-inning scenarios, and the team is likely to rely on him heavily as part of the bullpen’s core.
Cooper Criswell is the other newcomer, and his versatility stands out. With experience as both a starter and reliever, he is well-suited for a long relief role, providing the Mariners with flexibility in managing their pitching staff. He can absorb multiple innings when needed, which is particularly useful early in the season as starters continue to build up their workloads.
As for the rest of the bullpen, there is a mix of stability and uncertainty. Bazardo, Brash, Ferrer, Speier, and Muñoz form a relatively dependable core, with Muñoz likely serving as the primary closer. On the other hand, pitchers like Vargas and Legumina face a more tenuous situation. While neither delivered consistently strong performances in the previous season, both are out of minor league options. This means the Mariners would have risked losing them permanently if they had not been included on the roster.
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Given the lack of standout alternatives emerging from spring training—aside from perhaps Cole Wilcox, who still has minor league options remaining—the team opted to retain Vargas and Legumina for the time being. However, these spots could be subject to change as the season progresses, especially once the team begins to deal with the inevitable challenges of injuries and performance fluctuations.
Overall Outlook
In summary, the Mariners’ 2026 Opening Day roster reflects a blend of expected outcomes and subtle surprises. The team has managed to maintain a strong foundation despite a few early injuries, and the players stepping into temporary roles have earned their opportunities through solid performances.
The roster’s flexibility stands out as a defining characteristic, with multiple players capable of covering various positions and adapting to different situations. This adaptability should serve the Mariners well as they navigate the early portion of the season and await the return of key contributors like Crawford and Miller.
While there are always areas of uncertainty—particularly within the bullpen and among certain bench roles—the overall composition of the team suggests a high level of preparedness. If the Mariners can maintain their health and receive consistent contributions across the roster, they appear well-positioned to start the 2026 season on a strong note.
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