The Seattle Mariners' infield is poised to be the epicenter of excitement this season, and it’s not just about the players—it’s about the potential shake-ups that could redefine the team’s future. With a mix of seasoned veterans and rising stars, the infield is where the Mariners’ biggest offseason moves will truly come to life. But here’s where it gets controversial: how will the team balance its roster to accommodate both established talent and promising prospects? Let’s dive in.
Seattle’s offseason was marked by significant changes, particularly in the infield. The re-signing of Josh Naylor and the trade for Brendan Donovan addressed two critical positions, but the departures of Jorge Polanco and Eugenio Suárez to free agency left gaps that needed filling. This turnover is the most substantial on what many consider the American League’s strongest roster. But is this reshuffling a step forward or a risky gamble?
Naylor and J.P. Crawford are locked into first base and shortstop, respectively, providing stability at key positions. Donovan, a versatile player, is expected to be an everyday starter. While he’s a solid defender at second base and can handle the corner outfield, his below-average speed makes him a better fit for the infield. Interestingly, Ryan Divish of The Seattle Times notes that Donovan has been working at third base with infield coach Perry Hill—a short-term solution that raises questions about long-term positioning. Could this be a temporary fix or a strategic move to maximize his utility?
Third base is where things get tricky. Last season, Suárez and Ben Williamson, who was traded in the Donovan deal, took most of the playing time. Of the five players who started at third in 2025, only Miles Mastrobuoni remains. Donovan hasn’t played third recently but logged 269 2/3 innings there between 2022-24, earning above-average defensive marks. Is he the answer, or will the Mariners look elsewhere?
Donovan’s role will largely depend on the progress of younger players like Cole Young, who had a rough end to his rookie season but remains a favorite to start at second base. A former first-round pick with impressive minor league stats, Young is still a promising talent despite no longer being a prospect. But can he bounce back and secure his spot?
Then there’s Colt Emerson, the 20-year-old shortstop and 2023 first-round pick, who is widely regarded as one of the top prospects in baseball. With a stellar batting line across three minor league levels and a well-rounded skillset, Emerson is the heir apparent at shortstop once Crawford hits free agency. But here’s the kicker: could he force his way onto the Opening Day roster with a monster Spring Training? President of baseball operations Jerry Dipoto hasn’t ruled it out, praising Emerson’s maturity and talent. If that happens, Donovan could shift to second base, potentially sending Young to Triple-A. Is this a risk worth taking, or should the Mariners play it safe?
Ryan Bliss, last year’s season-opening second baseman, has flown under the radar despite his potential. A former second-round pick, Bliss had an impressive 2024 in Triple-A but suffered injuries that limited his MLB opportunities. Now fully healthy, he’s a strong contender for the second base job. Will he reclaim his spot, or will Young’s promise keep him in the lead?
The infield’s depth doesn’t end there. Players like Leo Rivas and the out-of-options Miles Mastrobuoni and Luke Raley add to the competition. With limited bench spots and decisions to be made, someone will inevitably be squeezed out. Who will it be, and what does this mean for the team’s chemistry?
As Spring Training unfolds, the Mariners’ infield is a hotbed of talent, potential, and tough decisions. Is this the year Seattle’s infield becomes the envy of the league, or will roster management prove to be their Achilles’ heel? What do you think? Let us know in the comments—this is one discussion you won’t want to miss!
