The Seattle Mariners visit the Boston Red Sox on Monday, August 31, 2026. Seattle comes in with a 64-73 record, while Boston boasts a stronger 74-63 mark. The Red Sox have the edge in the standings, indicating they’ve likely been the more consistent team this season.
Looking at the betting lines, Boston is favored on the moneyline at -171, meaning you’d need to bet $171 to win $100 backing the Red Sox outright. Seattle’s moneyline sits at +141, so a $100 bet on the Mariners pays $141 if they pull off the upset. This suggests the market sees Boston as the likely winner, but Seattle has some value if you like the underdog.
The spread is set at 1.5 runs. Seattle is the away team at +1.5 with odds of -149, which means you’d bet $149 to win $100 on Seattle to either win the game or lose by just one run. Boston is -1.5 at +124, so a $100 wager on Boston requires them to win by two or more runs. The odds for Boston on the spread are positive, offering a bit more return if you think they’ll cover comfortably.
The total runs line is 8.0, with the under priced at -117 and the over at -103. This slight lean toward the under suggests the market expects a moderately paced game, possibly a pitching duel or low scoring contest.
In summary, Boston is favored to win and cover, but Seattle’s spread price offers some protection. The total points to a game that won’t be a slugfest. Choose your angle based on how much risk you want with the underdog or the favored team.