Jul 22, 2026
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Read Article Cardinals vs. Royals prediction: St. Louis favored to win Sunday's MLB matchup [6/21/2026]
Updated: | First published:
Written by Jason Bevilacqua, Head of Content and Communities
Get St. Louis Cardinals vs Kansas City Royals predictions for MLB Sunday.
The Kansas City Royals will face the St. Louis Cardinals, in what is expected to be a tight MLB game, at Kauffman Stadium on Sunday, commencing at 2:10 PM ET.
The Royals will start Stephen Kolek (4-1, 2.68 ERA), up against Dustin May (5-6, 3.75 ERA) for the Cardinals.
Based on updated simulations, Dimers' proven MLB model gives the Cardinals a slight edge with a 51.3% win probability over the Royals.
This article offers a closer look at Sunday's Cardinals vs. Royals matchup, including best bets and picks.
Cardinals vs. Royals prediction: Who will win and cover?
Using trusted machine learning and statistical analysis, we have simulated the outcome of Sunday's MLB matchup between the Cardinals and Royals, forming part of our MLB predictions coverage.
Our famous predictive model gives the Cardinals a 51.3% chance of defeating the Royals.
According to our model, the Royals (+1.5) have a 60.3% chance of covering the run line, while the 9-run over/under has a 52.6% chance of going over,.
Cardinals vs. Royals odds [6/21/2026]
We have sourced the best MLB odds in America for this game, which are listed here:
| Bet Type | Cardinals | Royals |
|---|---|---|
| Run Line | -1.5 (+129) | +1.5 (-154) |
| Moneyline | -125 | +110 |
| Total | o9 (-105) | u9 (-112) |
All odds are correct at the time of publication and are subject to change.
Cardinals vs. Royals 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 | Royals +1.5 | -154 |
| Moneyline | Royals | +110 |
| Total | Over 9 | -105 |
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.
Cardinals vs. Royals game-day updates and essential details
Sunday's MLB matchup between the Royals and Cardinals at Kauffman Stadium is scheduled to start at 2:10 PM ET.
- Who: St. Louis Cardinals vs. Kansas City Royals
- Date: Sunday, June 21, 2026
- Time: 2:10 PM ET/11:10AM PT
- Venue: Kauffman Stadium
Conclusion
We predict the Cardinals, with a 51.3% win probability, will likely beat the Royals in Sunday's MLB matchup.
Additional tools and information for betting safely can be found in our Responsible Gambling hub.
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.
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