Reds vs. Mariners prediction: Seattle favored to win Monday's MLB matchup [7/20/2026]
Get Cincinnati Reds vs Seattle Mariners predictions for MLB Monday.
The Seattle Mariners will square off with the Cincinnati Reds in MLB action at T-Mobile Park on Monday, commencing at 9:40 PM ET.
The Mariners will send George Kirby (7-8, 3.76 ERA) to the mound, up against Andrew Abbott (5-5, 4.11 ERA) for the Reds.
Based on the latest simulation results, Dimers' advanced MLB model predicts the Mariners as the most likely winner of the Reds vs. Mariners game.
This article offers an expanded analysis of Monday's matchup, including best bets and picks.
Reds vs. Mariners prediction: Who will win and cover?
Our leading predictive model currently gives the Mariners a 58.1% chance of defeating the Reds.
According to our model, the Reds (+1.5) have a 59.7% chance of covering the run line, while the over/under total of 7.5 runs has a 55.4% chance of going over,.
Reds vs. Mariners odds [7/20/2026]
We have researched the best MLB odds in America for this game, which are listed here:
| Bet Type | Reds | Mariners |
|---|---|---|
| Run Line | +1.5 (-156) | -1.5 (+156) |
| Moneyline | +138 | -138 |
| Total | o7.5 (-104) | u7.5 (+102) |
All odds are correct at the time of publication and are subject to change.
Reds vs. Mariners 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:
| Bet Type | Pick | Bet Now |
|---|---|---|
| Run Line | Mariners -1.5 | +156 |
| Moneyline | Mariners | -138 |
| Total | Over 7.5 | -104 |
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 sportsbook odds.
Reds vs. Mariners game-day updates and essential details
Monday's MLB action between the Mariners and Reds at T-Mobile Park is scheduled to start at 9:40 PM ET.
- Who: Cincinnati Reds vs. Seattle Mariners
- Date: Monday, July 20, 2026
- Time: 9:40 PM ET/6:40PM PT
- Venue: T-Mobile Park
Conclusion
We predict the Mariners, with a 58.1% win probability, will likely beat the Reds in Monday's MLB matchup.
Additional tools and information for betting safely can be found in our Responsible Gambling hub.
Continue reading with Dimers Pro
Join now to unlock this article and get full access to our predictions and betting tools. Cancel anytime.
Jason Bevilacqua, an expert in MLB, NHL, NBA, MLS, and NFL, delivers game previews, best bets, and props. Since 2020, as Head of Social and Community at Dimers, he has contributed insightful articles utilizing data-driven models and simulations.
