Mariners vs. Red Sox prediction: Boston favored to win Tuesday's MLB matchup [9/1/2026]

The Boston Red Sox will take on the Seattle Mariners, in what is expected to be a tight MLB game, at Fenway Park on Tuesday, starting at 6:45 PM ET.

Jedixson Paez (0-0, 18.00 ERA) will get the ball for the Red Sox, while the Mariners have opted for Bryan Woo (9-9, 4.36 ERA).

Dimers' advanced MLB model gives the Red Sox a slight edge with a 51.2% win probability over the Mariners.

This article offers a complete Mariners vs. Red Sox prediction, including best bets and picks.

Mariners vs. Red Sox prediction: Who will win and cover?

Using innovative machine learning and data, we have simulated the result of Tuesday's MLB game between the Mariners and Red Sox, forming part of our MLB predictions coverage.

Our independent predictive model gives the Red Sox a 51.2% chance of beating the Mariners.

According to our model, the Mariners (+1.5) have a 63.6% chance of covering the run line, while the 7.5-run over/under has a 55.5% chance of going over.

Mariners vs. Red Sox odds [9/1/2026]

We have researched the best MLB odds in America for this game, which are listed here:

• Run Line: Mariners +1.5 (-190) / Red Sox -1.5 (+170)
• Moneyline: Mariners +113, Red Sox -111

All odds are correct at the time of publication and are subject to change.

Mariners vs. Red Sox picks and best bet

After matching our predictions against the best available odds, we can reveal our picks for each of the major markets in this matchup. Plus, find our best bet for the game below:

• Run line: Red Sox -1.5 @ +170 via DraftKings
• Moneyline: Mariners @ +113 via Polymarket
• Total: Over 7.5 @ +108 via Polymarket

According to our MLB best bets, the top play to make on this game is Over 7.5 total runs.

These picks are based on our probabilities matched against the implied probabilities from the sportsbook odds.

Mariners vs. Red Sox game-day updates and essential details

Tuesday's MLB matchup between the Red Sox and Mariners at Fenway Park is scheduled to begin at 6:45 PM ET.

• Who: Seattle Mariners vs. Boston Red Sox
• Date: Tuesday, September 1, 2026
• Time: 6:45 PM ET/3:45PM PT
• Venue: Fenway Park

Conclusion

We predict the Red Sox, with a 51.2% win probability, will likely beat the Mariners in Tuesday's MLB matchup.

Additional tools and information for betting safely can be found in our Responsible Gambling hub.