Seattle Mariners vs St. Louis Cardinals Picks and Prediction for Wednesday, September 10, 2025

By: Garrett Beaverson Published 09/10/2025, 12:55 AM ET
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The St. Louis Cardinals (72–73) travel to take on the Seattle Mariners (76–68) on Wednesday, September 10, 2025, with first pitch scheduled for 9:40 PM ET (6:40 PM PT) at T-Mobile Park. The game will be broadcast on ROOT Sports NW and FDSMW, with streaming available via Fubo. Get in on the action with our free MLB picks.

Cardinals Analysis

St. Louis remains in playoff mathematically but sits under .500, reflecting a season of middling results. The team is motivated by recent returns—Willson Contreras returns from suspension, providing a boost behind the plate—but the bullpen is weaker following deadline trades that removed key relievers. They start Michael McGreevy (6–3, 4.68 ERA) tonight, a groundball-focused rookie offering modest stability. The Cardinals can generate offense, but their inconsistent rotation and diminished relief depth remain glaring weaknesses.

Mariners Analysis

Seattle comes into the game riding a three-game win streak, including a 4–2 comeback win in Game 1 of this series, fueled by a dominant start from Bryan Woo (6 IP, 9 K) and timely hits from Josh Naylor and others.  They’ll counter with Logan Gilbert (4–6, 3.61 ERA), who brings a dependable strikeout arm and a consistent rotation presence. The Mariners’ lineup remains well-balanced, with Cal Raleigh (53 HR, 113 RBI), Julio Rodríguez (30 HR, 90 RBI), and strong overall depth at the plate.

Standout Players and Key Injuries

  • Cardinals:

    • Willson Contreras returns after a suspension, rebooting offense (.254 AVG, 20 HR, 78 RBI).The

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  • Mariners:

    • Bryan Woo impressed in the series opener with dominant control and strikeout ability.

    • Cal Raleigh, Julio Rodríguez, and Josh Naylor continue producing throughout the lineup.

No additional injuries were reported for either team ahead of this matchup.

Mariners vs Cardinals Prediction Reasoning

Seattle’s version of late-season momentum—a healthy rotation, playoff push, and game-winning rally in the series opener—gives them a clear edge. St. Louis remains competitive but lacks bullpen depth and pitching consistency. Expect another close but controlled Mariners win.

Final Score Projection: Mariners 5, Cardinals 2

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