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Read Article Giants vs. Diamondbacks prediction: Why Arizona is favored to win Monday's MLB matchup [5/18/2026]
Updated: | First published:
Written by Dave Garofolo, Content Producer
Get San Francisco Giants vs Arizona Diamondbacks predictions for MLB Monday.
The Arizona Diamondbacks will face the San Francisco Giants in MLB action at Chase Field on Monday, beginning at 9:40 PM ET.
Zac Gallen (1-4, 5.02 ERA) will get the ball for the Diamondbacks, pitting him against Robbie Ray (3-5, 3.04 ERA) for the Giants.
Based on the latest simulation results, Dimers' proven MLB model projects the Diamondbacks as the most likely winner of the Giants vs. Diamondbacks game.
This article offers a closer look at Monday's matchup, including best bets and picks.
Giants vs. Diamondbacks prediction: Who will win and cover?
Using powerful machine learning and data, we have simulated the outcome of Monday's MLB game between the Giants and Diamondbacks, forming part of our MLB predictions coverage.
Our leading predictive model currently gives the Diamondbacks a 57% chance of defeating the Giants.
According to our model, the Giants (+1.5) have a 59% chance of covering the run line, while the over/under total of nine runs has a 59% chance of going over.
Giants vs. Diamondbacks odds [5/18/2026]
We have sourced the best MLB odds in America for this game, which are listed here:
| Bet Type | Giants | Diamondbacks |
|---|---|---|
| Run Line | +1.5 (-178) | -1.5 (+147) |
| Moneyline | +116 | -136 |
| Total | o9 (-115) | u9 (-103) |
All odds are correct at the time of publication and are subject to change.
Giants 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. Plus, find our best bet for the game below:
| Bet Type | Pick | Bet Now |
|---|---|---|
| Run Line | Diamondbacks -1.5 | +147 |
| Moneyline | Diamondbacks | -136 |
| Total | Over 9 | -115 |
According to our MLB best bets, the top play to make on this game is Over 9 total runs.
These picks are based on our probabilities matched against the implied probabilities from the sportsbook odds.
Giants vs. Diamondbacks game-day updates and essential details
Monday's MLB matchup between the Diamondbacks and Giants at Chase Field is scheduled to commence at 9:40 PM ET.
- Who: San Francisco Giants vs. Arizona Diamondbacks
- Date: Monday, May 18, 2026
- Time: 9:40 PM ET/6:40PM PT
- Venue: Chase Field
Conclusion
We predict the Diamondbacks, with a 57% win probability, will likely beat the Giants in Monday'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.
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