Minnesota vs Seattle

This is a July 31, 2026 MLB matchup between the Minnesota Twins and the Seattle Mariners at T-Mobile Park. The moneyline markets are the headline — Kalshi prices the Mariners at 60.0% and Polymarket at 61.0%, while the Twins sit at 40.0% on Kalshi and 39.0% on Polymarket, making Seattle a clear but modest favourite. The 1.0-point cross-platform gap on the Mariners moneyline is the only meaningful spread across all markets listed, suggesting broadly efficient pricing between the two platforms. Seattle starter Bryce Miller enters with a 2.75 ERA, a strong advantage over Minnesota's Zebby Matthews, who is 4-8 with a 5.21 ERA. Seattle's home record of 30-23 gives the Mariners a meaningful edge at T-Mobile Park, and markets reflect this — the total-runs lines suggest a moderate-scoring game, with the combined over 7.5 runs sitting at just 51.0% on Kalshi. With Monday's trade deadline looming and the Twins a direct Wild Card rival, the direction of Seattle's season could hinge on this series. Minnesota enters at 55-55, sitting three games back in the AL Central, while Seattle is 53-57 and 2.5 games back in the AL West. The prop slate is dominated by Kalshi and centres heavily on Miller's strikeout total and Cal Raleigh's offensive output. Kalshi prices Bryce Miller at 86.0% to record 3+ strikeouts and 81.0% to reach 4+, underscoring confidence in his effectiveness on the mound. The only notable cross-platform discrepancy is the 1.0-point spread on the Mariners moneyline (Kalshi 60.0%, Polymarket 61.0%), pointing to a market that is otherwise closely aligned across platforms.