Reds vs. Diamondbacks prediction: Why Arizona is favored to win Friday's MLB matchup [8/21/2026]

The Arizona Diamondbacks will square off with the Cincinnati Reds in MLB action at Chase Field on Friday, beginning at 9:40 PM ET.

The Diamondbacks will have Eduardo Rodriguez (12-4, 2.71 ERA) as their starting pitcher, while the Reds are going with Nick Lodolo (3-2, 4.52 ERA).

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

This article offers an expanded analysis of Friday's matchup, including best bets and picks.

Reds vs. Diamondbacks prediction: Who will win and cover?

Using innovative machine learning and statistical analysis, we have simulated the outcome of Friday's MLB game between the Reds and Diamondbacks, forming part of our MLB predictions coverage.

Our leading predictive model gives the Diamondbacks a 57.4% chance of defeating the Reds.

According to our model, the Reds (+1.5) have a 59.2% chance of covering the run line, while the 8.5-run over/under has a 58.6% chance of going over.

Reds vs. Diamondbacks odds [8/21/2026]

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

• Run Line: Reds +1.5 (-147) / Diamondbacks -1.5 (+145)
• Moneyline: Reds +141, Diamondbacks -141

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

Reds vs. Diamondbacks 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: Diamondbacks -1.5 @ +145 via DraftKings
• Moneyline: Reds @ +141 via Novig
• Total: Over 8.5 @ +106 via Novig

According to our best MLB 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 sportsbook odds.

Reds vs. Diamondbacks game-day updates and essential details

Friday's MLB matchup between the Diamondbacks and Reds at Chase Field is scheduled to begin at 9:40 PM ET.

• Who: Cincinnati Reds vs. Arizona Diamondbacks
• Date: Friday, August 21, 2026
• Time: 9:40 PM ET/6:40PM PT
• Venue: Chase Field

Conclusion

We predict the Diamondbacks, with a 57.4% win probability, will likely beat the Reds in Friday's MLB matchup.

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