Marlins vs. Diamondbacks prediction: Why Arizona is favored to win Tuesday's MLB matchup [9/15/2026]

The Arizona Diamondbacks and Miami Marlins will lock horns in MLB action at Chase Field on Tuesday, starting at 9:40 PM ET.

The Diamondbacks will send Michael Soroka (8-5, 3.53 ERA) to the mound, up against Janson Junk (6-9, 4.54 ERA) for the Marlins.

Dimers' advanced MLB model projects the Diamondbacks as the most likely winner in this Marlins vs. Diamondbacks prediction.

This article offers a closer look at Tuesday's matchup, including best bets and picks.

Marlins vs. Diamondbacks prediction and odds

Using innovative machine learning and data analysis, we have re-simulated the outcome of Tuesday's MLB matchup between the Marlins and Diamondbacks, forming part of our MLB predictions coverage.

Our famous predictive model currently gives the Diamondbacks a 60.1% chance of defeating the Marlins. According to our model, the Marlins (+1.5) have a 56.2% chance of covering the run line, while the 8.5-run over/under has a 60.5% 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: Marlins +1.5 (-147) / Diamondbacks -1.5 (+144)
• Moneyline: Marlins +147, Diamondbacks -150
• Total: Over/Under 8.5 (-108/+108)

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 current 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: Diamondbacks -1.5 @ 41¢ via Polymarket
• Moneyline: Diamondbacks @ -150 via bet365
• Total: Over 8.5 @ 52¢ via Novig

According to our MLB best bets, the top play to make on this game is Over 8.5 total runs.

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

Game info & first pitch details

Tuesday's MLB action between the Diamondbacks and Marlins at Chase Field is scheduled to start at 9:40 PM ET.

• Who: Miami Marlins vs. Arizona Diamondbacks
• Date: Tuesday, September 15, 2026
• Time: 9:40 PM ET/6:40PM PT
• Venue: Chase Field

Conclusion

We predict the Diamondbacks, with a 60.1% win probability, will likely beat the Marlins in Tuesday'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.