St. Louis Cardinals (72-74, 5-5 ATS in last 10) vs. Seattle Mariners (77-68, 7-3 ATS in last 10)
Date/Time: September 11, 2025 — 9:40 PM ET
Where: T-Mobile Park, Seattle, Washington
TV: ROOT Sports NW, FDSMW
Moneyline: Cardinals +188 / Mariners -225
Run Line: Cardinals +1.5 (-115) / Mariners -1.5 (-104)
Over/Under Total: 7.5 runs
The public is heavily backing the Mariners with 67% of tickets on Seattle as the M's look to sweep the Cardinals in this interleague series.
Game Overview
The Seattle Mariners have taken the first two games of this three-game interleague series against the St. Louis Cardinals, winning 4-2 on Monday and 5-3 on Tuesday. Seattle is looking to complete the sweep and continue their push toward an AL West title. The Cardinals have struggled on this west coast road trip, now 5-5 in their last 10 games while the Mariners have gone 7-3 in that same span. T-Mobile Park continues to be one of MLB's most pitcher-friendly venues with a park factor of just 0.843 for runs (lowest in MLB), which has been reflected in the relatively low-scoring first two games of this series.
Key Matchups & Analysis
- Starting Pitching Matchup
The Mariners hold a significant advantage in today's pitching matchup with Logan Gilbert (4-6, 3.61 ERA) taking the mound against Cardinals' right-hander Michael McGreevy (6-3, 4.68 ERA). Gilbert has been excellent at home this season and boasts impressive peripheral numbers with 151 strikeouts in just 109.2 innings and an elite 1.02 WHIP. His strikeout prowess could be devastating against a Cardinals lineup that has struggled with swing-and-miss issues. McGreevy has been serviceable but unspectacular for St. Louis, posting a 4.68 ERA with just 43 strikeouts in 73 innings and a 1.26 WHIP. His low strikeout rate (5.3 K/9) is concerning against a Mariners lineup with power potential. - Bullpen Comparison
Seattle's bullpen presents another clear advantage for the home team. The Mariners feature one of MLB's elite closers in Andres Munoz (34 saves) and have excellent setup men in Matt Brash (21 holds) and Gabe Speier (21 holds). Their bullpen depth extends to Luke Jackson (9 saves) and Carlos Vargas (14 holds). Meanwhile, the Cardinals' bullpen has been less reliable, relying primarily on JoJo Romero (7 saves, 21 holds) and Kyle Leahy (17 holds). This disparity becomes particularly important in a low-scoring environment like T-Mobile Park where late-inning situations often determine outcomes. - Offensive Trends
The Mariners' offense has been clicking lately, averaging 4.66 runs per game for the season compared to the Cardinals' 4.29. Seattle's power advantage is substantial with 1.46 HR per game versus St. Louis' 0.94. Cal Raleigh (.240/.349/.574 with 72 extra-base hits) and Julio Rodriguez (.266/.317/.476 with 60 extra-base hits) provide dangerous middle-of-the-order threats. Josh Naylor has been particularly hot, batting .467 with three homers in his last five games. The Cardinals counter with Alec Burleson (.285/.335/.457) and Willson Contreras (.256/.339/.449), but lack the same power potential throughout their lineup. - Ballpark Factors
T-Mobile Park ranks as the most extreme pitcher's park in baseball with a run factor of just 0.843 and a home run factor of 0.894. This heavily favors Gilbert, who already possesses excellent control and misses bats at a high rate. The suppressive nature of the ballpark further limits the Cardinals' already modest power output, while the Mariners have constructed their roster to succeed in these conditions. The low total of 7.5 reflects this venue's characteristics, though the slight juice toward the under (-120) suggests oddsmakers believe runs could be even scarcer than usual.
What puts me over the top on this play is the Cardinals' 2-4 record so far on this West Coast swing and their -44 run differential on the season compared to Seattle's +36. The Mariners have also dominated this head-to-head series, winning four of the last five meetings including both games in this current series. With the motivation of a potential sweep and playoff implications, look for Seattle to handle business decisively behind Gilbert's strong performance.