Astros Fans Take Note: Mariners Add Right-Hander Cooper Criswell in AL West Shuffle

The Houston Astros continue gearing up for a competitive season, and their division rivals just made another depth move worth watching. The Seattle Mariners have acquired right-hander Cooper Criswell from the New York Mets in exchange for cash considerations, adding another arm to a rotation-heavy roster that has already leaned on pitching strength to push for the top of the AL West.

Criswell, known for his command and strike-throwing approach, has bounced between several clubs over the past few years. His most recent stint with the Mets was brief, but the Mariners saw enough upside to bring him in as a low-cost depth option. While not a headline-grabbing move, it’s the type of transaction that can quietly shape a season—especially in a division race as tight as the one the Astros expect to navigate.

Why It Matters for Houston

The Astros and Mariners have battled closely for the AL West crown in recent seasons. Seattle continues to build its pitching staff, a known strength that helped them stay in contention throughout last year. Any bolstering of their rotation or bullpen—even at the depth level—creates potential downstream effects on how the division plays out.

Houston has relied on timely hitting and frontline pitching to stay competitive, even as injuries challenged the roster last year. That means every move within the division gets magnified. Criswell may not immediately change Seattle’s outlook, but he offers them flexibility and insurance—two things the Astros know can matter late in the season.

What’s Next

The Astros’ front office has remained measured this offseason, focusing on internal development and targeted upgrades. However, as AL West rivals like Seattle keep adjusting their rosters, Houston may feel pressure to make a move of its own, especially as Spring Training approaches.

Astros fans should expect more roster churn across the division in the coming weeks, and Criswell’s addition is likely one of several moves still ahead.

This article is a summary of reporting by The Washington Post. Read the full story here.