Seattle Mariners vs St. Louis Cardinals Picks and Prediction for Sunday April 26 2026
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Sunday afternoon on the MLB diamond, and we have a Seattle vs. St. Louis prediction locked and loaded for you. Seattle won game one by a score of 3-2 and game two by a score of 11-9. The Mariners have now won the last six games in this series. Seattle enters this game at 13-15, while the Cardinals have gone 14-12 and have now lost three in a row overall. Read on to see our Mariners vs Cardinals prediction.
Pitching Probables: Emerson Hancock (2-1, 2.83 ERA) is slated to go for the Mariners, while the Cards will send out Michael McGreevy (1-2, 3.29 ERA).
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Seattle Owns St Louis
Seattle enters Sunday with full control of the series after a 3–2 win in the opener and an 11–9 slugfest on Saturday. The Mariners have now won six straight against St. Louis and improved to 13–15 on the season. Their offense has been inconsistent overall, ranking 24th in runs per game (4.11) and 21st in batting average (.233), but the power remains steady with 29 home runs. Seattle’s pitching has been the strength, carrying a 3.57 ERA and 1.23 WHIP, both top‑five in MLB. The defense has also been sharp with only 11 errors, ranking 8th. Seattle hands the ball to Emerson Hancock, who owns a 2.83 ERA with 28 strikeouts and has allowed just nine earned runs in 28.2 innings.
For Seattle to complete the sweep, they must lean on their pitching advantage and avoid the lapses that nearly cost them Saturday’s game. Hancock’s efficiency will matter against a Cardinals lineup that can score in bursts. Seattle needs early traffic on the bases, continued defensive stability, and a cleaner bullpen performance after allowing multiple late runs in Game 2. If they control the strike zone and avoid giving St. Louis extra chances, the Mariners are positioned to extend their dominance in this matchup. 
St Louis Has Lost Three In A Row
St. Louis enters Sunday trying to stop a three‑game losing streak and avoid a sweep after dropping both games of the series. The Cardinals sit at 14–12, but the recent slide has exposed issues with consistency on both sides of the ball. Their offense ranks 11th in runs per game (4.73) and 13th in OPS (.713), with 32 home runs showing strong power potential. However, the pitching staff has struggled, carrying a 4.94 ERA and 1.45 WHIP, both in the bottom tier of MLB. St. Louis turns to Michael McGreevy, who has been steady with a 3.29 ERA across 27.1 innings, allowing 10 earned runs and showing solid command.
For the Cardinals to salvage the finale, they must tighten their pitching and avoid the early deficits that have defined the first two games. McGreevy needs quick innings to keep the bullpen fresh after Saturday’s heavy workload. Offensively, St. Louis must capitalize on scoring chances and avoid the long droughts that have stalled rallies. If they limit Seattle’s power, control the middle innings, and clean up defensive execution, the Cardinals can finally slow a Mariners team that has dominated this matchup for six straight games.
Seattle vs. St. Louis Pick
Mariners vs Cardinals Spread Pick
- Seattle -141 (5 Units)
Seattle makes sense here because they’re finally pairing reliable pitching with an offense that’s starting to show signs of life, and that combination plays well against a St. Louis team that hasn’t looked sharp during this three‑game skid. The Mariners have controlled this matchup for six straight meetings, and their ability to limit damage while capitalizing on mistakes has been the difference throughout the series. With the Cardinals’ staff struggling to keep runners off base and Seattle getting steadier innings from the rotation, the matchup leans toward the road side again. Add in the confidence from taking the first two games, and Seattle feels like the right call in a spot where their strengths line up cleanly with St. Louis’ current issues.
Mariners vs Cardinals Over/Under Pick
- Over 8 (4 Units)
The Over makes plenty of sense here because both teams have shown they can score in bunches, and this matchup has already produced 20 total runs across the first two games. Seattle’s offense has been inconsistent overall, but it’s clearly trending upward, and St. Louis brings enough power to punish mistakes even when the lineup isn’t firing on all cylinders. The Cardinals’ pitching staff has struggled to keep runners off base, and their bullpen hasn’t looked sharp during this three‑game skid. Seattle’s pitching is strong, but St. Louis usually finds a way to scratch out runs at home, which helps push the total along. With both teams capable of quick bursts and neither bullpen in ideal form after Saturday’s high‑stress game, Over 8 fits the rhythm of this series.
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