St.Louis Cardinals vs Kansas City Royals Prediction
Expert prediction, odds analysis, and best bet for St.Louis Cardinals vs Kansas City Royals on June 18, 2026.
Win Probability
Best Bet
Current Odds
API-Sports| Team | Moneyline | Run Line | Total | Impl. Prob. |
|---|---|---|---|---|
St.Louis CardinalsAway | +100 | -208 | -105 | 50% |
Kansas City RoyalsHome | -120 | +163 | -116 | 55% |
Additional Full-Game Markets
First 5 Innings (F5)
Statistical Analysis
- 1
Kansas City Royals season record: 30–45 (40% win rate).
- 2
St.Louis Cardinals season record: 40–32 (56% win rate).
- 3
Limited game history — projection uses standings data only. Confidence reduced.
How This Prediction Was Made
Show model inputs ▼
Team Data Inputs
| Metric | Cardinals | Royals |
|---|---|---|
| Season Win% | 55.6% | 40.0% |
| Games Played | 72 | 75 |
| Season RF/G | 4.41 | 4.10 |
| Season RA/G | 4.19 | 4.50 |
| Run Diff/G | 0.22 | -0.40 |
| Last-5 RF/G | 4.30 | 4.30 |
| Last-5 RA/G | 4.30 | 4.30 |
| Venue RF/G | 4.41 | 4.10 |
| Venue RA/G | 4.19 | 4.50 |
| Venue Win% | 55.6% | 40.0% |
| Form (last-5) | 3/5 W | 3/5 W |
| Rest Days | 1 | 1 |
| Games (Last 7d) | 0 | 0 |
| Data Quality | 15% | 15% |
Run Projection Formula
Projected runs = weighted blend of offense + opponent defense (season & recent) + venue split.
| Component | Value | Wt | Contrib |
|---|---|---|---|
| Season RF/G | 4.41 | 30% | 1.324 |
| Opp Season RA/G | 4.50 | 30% | 1.350 |
| Recent RF/G (5G) | 4.30 | 15% | 0.645 |
| Opp Recent RA/G | 4.30 | 15% | 0.645 |
| Venue RF/G | 4.41 | 5% | 0.221 |
| Opp Venue RA/G | 4.50 | 5% | 0.225 |
| Projected runs | 4.4 | ||
| Component | Value | Wt | Contrib |
|---|---|---|---|
| Season RF/G | 4.10 | 30% | 1.230 |
| Opp Season RA/G | 4.19 | 30% | 1.256 |
| Recent RF/G (5G) | 4.30 | 15% | 0.645 |
| Opp Recent RA/G | 4.30 | 15% | 0.645 |
| Venue RF/G | 4.10 | 5% | 0.205 |
| Opp Venue RA/G | 4.19 | 5% | 0.209 |
| Home bonus | 0.12 | — | 0.120 |
| Projected runs | 4.3 | ||
Win Probability Blend (Home)
Three signals are blended to produce the final home win probability.
| Signal | Prob | Weight | Contribution |
|---|---|---|---|
| Run margin (projected score diff) | 49.0% | 65% | 31.85% |
| Team strength (win% + venue) | 44.2% | 25% | 11.05% |
| Recent form (last-5 W/L) | 50.0% | 10% | 5.00% |
| Final home win probability | 48% | ||
Confidence Score Breakdown
| Factor | Points |
|---|---|
| Base (win probability distance from 50%) | +51 |
| Run margin bonus (larger margin = more predictable) | +0.4 |
| Data quality adjust (more game history = tighter estimates) | -7 |
| Form agreement (recent form aligns with season record) | 0 |
| Market odds available (confirms edge vs vig) | 0 |
| Final confidence score (low) | 45 |
Market Edge Analysis
Edge = model probability minus market-implied probability. Positive edge = model sees value vs the book.
| Bet Type | Edge | Signal |
|---|---|---|
| Moneyline | -6.8% | ✓ fade |
| Run Line (-1.5) | -36.0% | ✓ fade |
| Over/Under | -3.5% | no edge |
| Royals Team Total | -2.5% | no edge |
| Cardinals Team Total | +0.0% | no edge |
| F5 Moneyline | -0.3% | no edge |
| F5 Over/Under | -3.5% | no edge |
4%+ edge threshold required for a value bet recommendation.
St.Louis Cardinals vs Kansas City Royals Prediction — Expert Analysis
Our model projects St.Louis Cardinals to win this matchup with a 52% win probability. The predicted final score is Cardinals 4.4 – Royals 4.3.
St.Louis Cardinals come into this game with a 40-32 record, good for a 55.6% winning percentage.
Kansas City Royals are 30-45 at home this season, with a 40.0% overall win rate. Home field advantage gives them an additional 3-4% boost to their projected win probability.
Our best bet for this matchup is the No bet, which carries a low confidence rating based on current statistical inputs.