Royals vs. Red Sox prediction: Boston favored to win Sunday's MLB matchup [9/13/2026]

Using trusted machine learning and data, we have re-simulated the outcome of Sunday's MLB game between the Royals and Red Sox, forming part of our MLB predictions coverage.

Our famous predictive model gives the Red Sox a 59.9% chance of beating the Royals. According to our model, the Royals (+1.5) have a 57.3% chance of covering the run line, while the 7.5-run over/under has a 56.3% chance of going over.

Latest betting odds

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

• Run Line: Royals +1.5 (-138) / Red Sox -1.5 (+134)
• Moneyline: Royals +163, Red Sox -170
• Total: Over/Under 7.5 (+108/-113)

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

Model 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 @ +134 via FanDuel
• Moneyline: Royals @ 38¢ via Polymarket
• Total: Over 7.5 @ 48¢ 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 current available odds.

Game info & first pitch details

Sunday's MLB matchup between the Red Sox and Royals at Fenway Park is scheduled to begin at 3:05 PM ET.

• Who: Kansas City Royals vs. Boston Red Sox
• Date: Sunday, September 13, 2026
• Time: 3:05 PM ET/12:05PM PT
• Venue: Fenway Park

Conclusion

We predict the Red Sox, with a 59.9% win probability, will likely beat the Royals in Sunday's MLB matchup.

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

This article's predictions and probabilities are generated by Dimers' proprietary MLB prediction model. Our editorial team reviews the resulting content for accuracy and presentation before publication.