Boston Red Sox vs Seattle Mariners Prediction and Picks, August 31, 2026

The Seattle Mariners are at +140 to win against the Boston Red Sox, and it's a decent chance for a nice payout. The Mariners have struggled against left-handed pitchers this year, which could be an issue if the Red Sox send one out to the mound. However, the Mariners have been solid at home but not so great on the road, making this matchup tricky. The Red Sox have been hot lately, winning 7 of their last 10 games, and they hit well against lefties. That makes them tough competition, especially at Fenway Park, where they have a winning record. The biggest risk here is that the Mariners have a weak track record against left-handed starters, which could leave them vulnerable.

Boston Red Sox vs Seattle Mariners: Seattle Mariners 1 Spread (-110)

The odds for the Seattle Mariners to win by at least one run look pretty good. The Mariners have struggled against left-handed pitchers this season, and they're up against a strong Red Sox team that has won seven of their last ten games. The Red Sox really hit well against lefties, so that could make things tough for Seattle. One clear risk is that both teams have played better at home, and the Red Sox are decent at Fenway Park. Seattle's recent form isn't bad, but their struggles against lefties could make a close game even tougher to win. Overall, it feels like the Mariners have a solid chance to pull this off.

Boston Red Sox vs Seattle Mariners: Over 8 Total Runs (-108)

Boston Red Sox play Seattle Mariners in the MLB. The bet we are looking at is Boston Red Sox vs Seattle Mariners: Over 8 Total Runs (-108). That is a totals bet. It was priced at -108 when we wrote this, so a $10 bet returns $19.26 if it lands. Our model rates this one a lean pick. Prices move, so check the price at your bookmaker before you back it. And if this one does not feel right to you, skipping it is a perfectly good move.

Boston Red Sox vs Seattle Mariners: Ceddanne Rafaela Under 1.5 Batter - Total Bases (-139)

The bet is for Ceddanne Rafaela to have under 1.5 total bases at -139 odds. The numbers suggest this might be a smart choice since Rafaela has struggled lately, averaging no hits in his last three games. Plus, the Seattle Mariners have found it tough against left-handed pitchers this year, which could limit his chances tonight. While the Boston Red Sox have been hitting well and winning games, the matchup isn't a total guarantee. The Mariners have won five of their last ten, so they could surprise. Plus, the wind blowing out at Fenway Park could help hitters, which adds a bit of risk. Just keep an eye on how Rafaela has been performing lately.

Boston Red Sox vs Seattle Mariners: Roman Anthony Under 1.5 Batter - Total Bases (-141)

Roman Anthony has been on a bit of a hot streak lately, getting hits more often than usual. However, he faces a tough matchup against the Seattle Mariners, who have been solid in limiting scoring against left-handed pitchers. The wind blowing out toward the outfield might help the hitters, but Anthony's bat could struggle against a team that's done well against players like him. While the Red Sox have been winning a lot recently, the Mariners know how to play tough on the road. With Anthony averaging no strikeouts in his last few games, it's possible he could get a hit or two, but staying under 1.5 total bases feels like a smart choice. Just remember, there's always a chance he could surprise us.

Boston Red Sox vs Seattle Mariners: Wilyer Abreu Under 1.5 Batter - Total Bases (-161)

Wilyer Abreu has been hitting well, but he's averaging less than a hit every game lately. The Boston Red Sox have been strong against left-handed pitchers this season, but Abreu's recent numbers suggest he might not keep up that pace tonight. The Seattle Mariners have struggled against lefties, and the wind blowing out at Fenway Park can help hitters, but Abreu only has a few chances in a game. The risk here is that he could just as easily have a quiet night. Betting on him to get under 1.5 total bases seems like a reasonable choice given all this.

That is everything our model likes in this game. Prices can move before you get on, so check the board at your bookmaker. Bet what you can afford to lose. If betting stops being fun, take a break.