Jun 21, 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 and St. Louis Cardinals will lock horns in MLB action at Kauffman Stadium on Sunday, starting at 2:10 PM ET.
Stephen Kolek (4-1, 2.68 ERA) will start for the Royals, pitting him against Dustin May (5-6, 3.75 ERA) for the Cardinals.
Based on updated simulation results, Dimers' proven MLB model gives the Cardinals a slight edge with a 50.6% win probability over the Royals.
This article offers further insights into Sunday's Cardinals vs. Royals matchup, including best bets and picks.
Cardinals vs. Royals prediction: Who will win and cover?
Using powerful machine learning and data 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 50.6% chance of beating the Royals.
According to our model, the Royals (+1.5) have a 60.3% chance of covering the run line, while the over/under total of nine runs has a 52.8% chance of going over,.
Cardinals vs. Royals odds [6/21/2026]
We have researched the best MLB odds in America for this game, which are listed here:
| Bet Type | Cardinals | Royals |
|---|---|---|
| Run Line | -1.5 (+130) | +1.5 (-155) |
| Moneyline | -124 | +106 |
| Total | o9 (-110) | u9 (-105) |
All odds are correct at the time of publication and are subject to change.
Cardinals vs. Royals picks and best bet
After matching our probabilities against the best current 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 | -155 |
| Moneyline | Royals | +106 |
| Total | Over 9 | -110 |
According to our MLB best bets, the top play to make on this game is Royals to win.
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 action between the Royals and Cardinals at Kauffman Stadium is scheduled to commence 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 50.6% 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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