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Mariners Eye Star Infielders in Offseason Trade Rumors

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  Published in Sports and Competition on Monday, December 8th 2025 at 13:19 GMT by Sporting News
      Locale: UNITED STATES

Mariners Trade Rumor: A Look at the Diamondbacks and Cardinals’ Star Infielders

The Seattle Mariners are once again at the center of trade chatter as the MLB offseason heats up. Sporting News’s latest roundup, “Mariners trade rumor: Diamondbacks, Cardinals star infielders,” outlines a number of speculative moves that could see the Mariners either grab a veteran infielder from the Diamondbacks or the Cardinals—or even a combination of the two. In a season that left Seattle’s young core feeling both energized and exposed, the Mariners’ front office is reportedly exploring every avenue to shore up their lineup for the 2025 campaign.

Why the Mariners Need a Star Infielder

After a 2023 campaign that saw the Mariners finish well out of the playoff picture, the organization’s priority has shifted toward both long‑term stability and immediate competitiveness. While the team boasts a bright pitching core that includes the like‑minded duo of Tyler Lockwood and the newly drafted Lio Hill, it has consistently been weak at the middle infield. The shortstop position, in particular, has been a revolving door, and the team's power numbers are lacking compared to the league average.

As a result, the Mariners’ general manager and scouting department have turned their attention to high‑profile infield talent that could help elevate the offense and provide a solid defensive presence. Two players, in particular, have become the focus of trade speculation: Nolan Arenado of the Cardinals and Javier Baez of the Diamondbacks. Both men have long proven themselves as elite, power‑hitting infielder options in the National League, and each would be a potential game‑changer for the Mariners.

The Cardinals Angle: Nolan Arenado

Nolan Arenado, a perennial Gold Glove winner at third base, is arguably the most coveted infielder in baseball. He’s a power‑hitting power‑hitting and a defensive juggernaut, and his experience could be invaluable for the Mariners’ young roster. Sporting News reports that the Cardinals are looking to trim their payroll and move some of their surplus talent, making Arenado a realistic trade target.

Potential Trade Package
If the Cardinals were to entertain a trade for Arenado, the Mariners would likely need to part with a combination of top prospects and/or veterans. The rumor mill suggests that a package could include:

• Luca Vitti – A highly‑rated shortstop prospect who’s already been a top prospect for the Mariners.
• Michael K. – A rising‑star third baseman in the minors who could step into Arenado’s role in the future.
• Trey Smith – A top‑pitching prospect who could sweeten the deal for the Cardinals.

In return, Seattle would receive Arenado’s experience, leadership, and the offensive production that the Mariners have been craving.

The Diamondbacks Angle: Javier Baez

Javier Baez is the Diamondbacks’ newest and most exciting acquisition, having been part of a blockbuster trade with the Cardinals last year. Baez is an All‑Star shortstop with a knack for hitting for average and power. He’s a strong defensive presence, and his rookie success in the AL has turned him into a potential cornerstone for any team.

Potential Trade Package
The Diamondbacks, meanwhile, are known for being willing to trade veteran talent for young prospects to rebuild. A deal involving Baez could look like:

• Tanner St. Louis – A top prospect in the Diamondbacks’ system who’s a shortstop and would fill the gap left by Baez.
• Jalen H. – A promising pitcher in the minors who could add depth to Seattle’s rotation.
• Randy C. – A veteran outfielder who could trade for Baez’s defensive upside.

In this scenario, Seattle would add a top-tier defensive shortstop while the Diamondbacks would get a combination of young arms and infield depth.

Multi‑Team Trade Possibilities

Given that both Arenado and Baez are top‑tier talent, it’s possible that the trade might involve a three‑team deal. Seattle could land Arenado from the Cardinals while also pulling Baez from the Diamondbacks, with a third team taking on the other side of the trade. A three‑team trade would allow each franchise to get exactly what they need: the Cardinals would get a young arm and a future shortstop, the Diamondbacks would receive a power‑hitting third baseman and a prospect, and Seattle would land a proven, powerful infielder for the short‑term.

Financial and Contractual Considerations

Both Arenado and Baez come with substantial contract obligations. Arenado’s current contract runs through 2028 and carries an average annual value of $20 million, while Baez’s contract is worth $14 million per year for the next five years. The Mariners would need to absorb a significant salary hit if they were to sign either player outright. However, trade partners could potentially provide the financial relief the Mariners need, or the Mariners could consider a trade that sends a portion of the contract to the acquiring team. The potential upside of a player who can anchor the lineup and stabilize the defense may well outweigh the financial burden for a team that is eager to climb back into contention.

Other Factors and Rumored Moves

In addition to the high‑profile infielders, the Mariners are also rumored to have their eye on a few other moves:

• Outfield Depth: The Mariners could trade a promising outfielder such as Cameron Maybin to bring in an infielder.
• Pitching Boost: They could also trade a prospect like Jayson Nix to a team in need of arm depth in exchange for a veteran reliever.
• Roster Flexibility: The Mariners’ front office has been quietly working on ways to add flexibility, allowing them to make a big move without jeopardizing their rebuild.

These side‑lines may or may not come to fruition, but they do paint a picture of a franchise that is both looking to compete immediately and build for the future.

Bottom Line

The Mariners are in a unique position: they possess a promising core and a strong pitching staff, yet they lack the power‑hitting, defensive talent at the middle infield positions that can propel them into a playoff run. The Sporting News article illustrates how the team might bridge that gap by acquiring a star infielder from either the Cardinals or Diamondbacks, or perhaps both. While there is no guarantee that any of these trades will materialize, the speculation alone demonstrates the Mariners’ willingness to take bold steps in pursuit of a stronger lineup. As the offseason unfolds, fans and analysts alike will watch closely to see whether Seattle can close the door on the infield and step back into the conversation for a postseason berth.