The Seattle Mariners visit the Boston Red Sox on Wednesday, September 2, 2026. Seattle comes in with a 65-74 record, while Boston holds a stronger 75-64 mark. This suggests the Red Sox have had a better season overall.
Looking at the betting odds, the Red Sox are favored at home. The moneyline has Boston at -137, meaning you’d need to bet $137 to win $100 on them outright. Seattle’s moneyline is +114, so a $100 bet would yield $114 if they pull off the upset. The spread is set at 1.5 runs. Boston is -1.5 at +153, which means you have to risk $100 to win $153 if they win by two or more runs. Seattle is +1.5 at -186, so you must bet $186 to win $100 if they lose by one run or win the game.
The total runs line is 8.5, with both over and under priced equally at -110. This means the sportsbook expects a moderately scoring game, and the payout is balanced whether you bet on more or fewer than 8.5 total runs.
Given Boston’s better record and home advantage, they are the favorite, but the spread and moneyline odds suggest a relatively close contest. Seattle getting 1.5 runs at a strong price (-186) could be worth considering if you expect a tight game. Otherwise, backing Boston straight up is the safer option. The total at 8.5 is a fair line for this matchup.