Seattle Mariners vs St. Louis Cardinals — DeepSeek betting tip 09 September 2025.

The Seattle Mariners enter as clear home favorites with odds of 1.43, reflecting strong confidence from bookmakers. This translates to an implied win probability of roughly 70% before adjusting for the bookmaker's margin, largely due to Seattle's robust home record and pitching depth. However, baseball's inherent volatility means underdogs like the St. Louis Cardinals often hold hidden value, especially at generous odds of 2.80. These odds imply only a 35.7% win chance for St. Louis, but historical MLB trends show away teams win over 40% of games, suggesting potential undervaluation here.

The Cardinals boast a resilient lineup capable of explosive offense, and their underdog status alleviates pressure, allowing aggressive play. Seattle's steep odds demand heavy risk for minimal return—a $235 stake nets just $100 profit—while St. Louis offers a high-reward $180 profit on a $100 bet. With no other data (e.g., starting pitchers), the value leans toward the underdog given baseball's unpredictability and the payout premium.

Ultimately, while the Mariners are statistically favored, the Cardinals' odds present a smarter profit opportunity. Betting on underdogs at +150 or higher has proven profitable long-term in MLB, making St. Louis the strategic choice for maximizing returns in this matchup.