Seattle Mariners vs Cleveland Guardians Prediction, Odds and Picks for Today, 08/29/25

The Seattle Mariners hand the ball to right hander George Kirby, who despite carrying a bloated 4.05 ERA, has underlying metrics suggesting much better performance. His high FIP indicates misfortune, and defensive lapses have inflated his numbers, but his elite command remains a key strength—walking just 3% of batters faced. Kirby looked sharp in his return from the IL earlier this season, even striking out 14 in a dominant 7-inning scoreless outing, proving he can still flash ace level form. Pitching at T-Mobile Park, one of the most pitcher-friendly environments in baseball, Kirby’s combination of accuracy and inducing weak contact makes him well positioned to contain Cleveland’s struggling offense. Seattle’s lineup has been streaky as well, often relying on timely hits rather than sustained rallies, adding to the expectation of a tight, low scoring night.

Opposite Kirby, the Cleveland Guardians turn to lefty Logan Allen, who has posted a 4.35 ERA and 1.43 WHIP over 25 starts, striking out 100 across 125 innings. While his most recent outing was a disaster—9 earned runs in just 5 innings against Texas—Allen has generally done enough to keep Cleveland competitive, mixing his arsenal combined with a knack for limiting extra base damage. That said, his recent uptick in walks and tendency to allow crooked innings have left little margin for error, especially with a Guardians offense that sits near the bottom of the league in production. With both teams relying more on pitching than offense and struggling to string together consistent scoring, this matchup sets up as a duel where runs will be at a premium.

Mariners vs Guardians prediction: Under 8 (-120) available at time of publishing. Playable to that number.

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