Rockies vs. Diamondbacks prediction: Why Arizona is favored to win Wednesday's MLB matchup [8/12/2026]
Get Colorado Rockies vs Arizona Diamondbacks predictions for MLB Wednesday.
The Arizona Diamondbacks and Colorado Rockies are scheduled to meet in MLB action at Chase Field on Wednesday, starting at 3:40 PM ET.
Merrill Kelly (8-9, 4.88 ERA) will start on the mound for the Diamondbacks, pitting him against Ryan Feltner (4-6, 5.71 ERA) for the Rockies.
Dimers' proven MLB model projects the Diamondbacks as the most likely winner in this Rockies vs. Diamondbacks prediction.
This article offers an expanded analysis of Wednesday's matchup, including best bets and picks.
Rockies vs. Diamondbacks prediction: Who will win and cover?
Our independent predictive model currently gives the Diamondbacks a 62.9% chance of beating the Rockies.
According to our model, the Rockies (+1.5) have a 54.2% chance of covering the run line, while the over/under total of 9.5 runs has a 52.7% chance of going over,.
Rockies vs. Diamondbacks odds [8/12/2026]
We have sourced the best MLB odds in America for this game, which are listed here:
- Run Line: Rockies +1.5 (-125) / Diamondbacks -1.5 (+120)
- Moneyline: Rockies +163, Diamondbacks -167
All odds are correct at the time of publication and are subject to change.
Rockies vs. Diamondbacks 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 @ +120 via DraftKings
- Moneyline: Diamondbacks @ -167 via Novig
- Total: Over 9.5 @ +108 via Novig
According to our best MLB bets, the top play to make on this game is Over 9.5 total runs.
These picks are based on our probabilities matched against the implied probabilities from the sportsbook odds.
Rockies vs. Diamondbacks game-day updates and essential details
Wednesday's MLB action between the Diamondbacks and Rockies at Chase Field is scheduled to commence at 3:40 PM ET.
- Who: Colorado Rockies vs. Arizona Diamondbacks
- Date: Wednesday, August 12, 2026
- Time: 3:40 PM ET/12:40PM PT
- Venue: Chase Field
Conclusion
We predict the Diamondbacks, with a 62.9% win probability, will likely beat the Rockies in Wednesday's MLB matchup.
Additional tools and information for betting safely can be found in our Responsible Gambling hub.
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Dave Garofolo uses sophisticated AI-driven analytics to make predictions and evaluate player performances in the NBA, MLB, NFL, NHL, NCAAM, and PGA TOUR tournaments, crafting insightful game and prop previews.
