MLB matchup analysis
White Sox vs Cardinals Prediction, Odds and Model Pick
Saturday, September 12, 2026 at Busch Stadium · 7:15 PM ET
Leo decision: Pass on White Sox vs Cardinals
The case for Chicago White Sox
The case for St. Louis Cardinals
Why it is not official
Why the setup score is what it is
Why the price is what it is
Read the full model output
This is a bullpen game -- no confirmed traditional starter, so Leo does not publish an official pick here.
Final result
White Sox 6, Cardinals 5
How the analysis held up
Chicago White Sox won, the side Leo's model favored.
Leo's two internal reads disagreed pregame by 48.7 points — the team-strength model favored Chicago White Sox, the run-projection model favored St. Louis Cardinals. The team-strength model had the winner here.
Sean Newcomb (Chicago White Sox) was Leo's favored starter by pitcher score, but Kyle Leahy actually pitched better tonight: 3.0 IP, 0 ER (0.00 ERA) against 1.1 IP, 1 ER (6.75 ERA). The edge did not show up in this game.
The Chicago White Sox bullpen was flagged as elevated risk pregame (High risk). In relief it actually allowed 4 earned runs over 7.2 innings (4.70 ERA) — the risk read showed up.
The St. Louis Cardinals bullpen was flagged as elevated risk pregame (Tired). In relief it actually allowed 6 earned runs over 6.0 innings (9.00 ERA) — the risk read showed up.
Chicago White Sox scored 6, 2.2 more than the 3.8 pregame projection.
Game information
| Matchup | Chicago White Sox at St. Louis Cardinals |
|---|---|
| Date | Saturday, September 12, 2026 |
| First pitch | 7:15 PM ET |
| Venue | Busch Stadium |
| Starting pitchers | Sean Newcomb vs Kyle Leahy |
| Weather | Game-time forecast: 84°F, 0% precipitation chance, 3 mph wind from W. |
Starting pitcher matchup
Full Pitcher Matchup Tool →| Metric | White Sox | Cardinals |
|---|---|---|
| Pitching plan | Opener / bullpen game | Traditional starter |
| Expected innings | 2 | 4⅔ |
| Throws | L | R |
| Leo pitcher score (higher is better) | 74 | 69 |
| ERA (lower is better) | 2.77 | 3.36 |
| WHIP (lower is better) | 1.14 | 1.31 |
| K/9 (higher is better) | 8.3 | 8.5 |
| K-BB% (higher is better) | 13.9% | 15.7% |
| K% (higher is better) | 22.6% | 22.4% |
| BB% (lower is better) | 8.7% | 6.7% |
| BB/9 (lower is better) | 3.2 | 2.6 |
| HR/9 (lower is better) | 0.2 | 0.9 |
| Ground-ball rate | 51.8% | 52.5% |
| Fly-ball rate | 48.2% | 47.5% |
Pitching plan edge: Leo gives the Chicago White Sox pitching plan the edge over Kyle Leahy (9 points on Leo's pitcher score). Sean Newcomb is projected for only 2 innings, with the Chicago White Sox bullpen covering the rest -- this compares the Chicago White Sox blended starting-pitcher-and-bullpen quality against Kyle Leahy's own line, not two starters directly.
Blended read: For the Chicago White Sox, the bullpen is projected to throw more of the game than Sean Newcomb (about 2 innings for the starter), so Leo grades that side on a whole-game effective ERA of 3.37 rather than Sean Newcomb's own 2.77. Whole-game, that is 3.37 for the Chicago White Sox against 4.41 on the other side, so the blended read leans Chicago White Sox.
How to read this: the scorecards above name the starters; every number lives in this table.
Strikeout Projections Full strikeout projections →
Same data source as the Pitcher Matchup Tool, where every starter on the slate is compared side by side.
Recent form
Full Stats page →White Sox are 3-7 in their last 10 and averaging 3.4 runs per game over the last 15 days; Cardinals are 5-5 in their last 10 and averaging 5.8 runs per game over the last 15 days. Season run differential separates them by almost nothing (+0.24 against -0.06).
| Metric | White Sox | Cardinals |
|---|---|---|
| Last 10 | 3-7 | 5-5 |
| Last 10 by venue (away team on the road, home team at home) | 5-5 on the road | 5-5 at home |
| OPS, last 15 days | 0.644 | 0.742 |
| wOBA, last 15 days (hot/cold read) | 0.291 | 0.326 |
| Runs per game, last 15 days | 3.4 | 5.8 |
| K% last 15 days (lower is better) | 25.3% | 20.4% |
Last 15 days only. Hot and cold streaks for all 30 teams live on the Stats page.
30-day offense
Full offense tool →| Last 30 days | White Sox | Cardinals |
|---|---|---|
| OPS | 0.723 | 0.734 (+0.031 vs szn) |
| Runs per game | 4.41 (-0.275 vs szn) | 5.39 (+0.829 vs szn) |
| wOBA (model offense input) | 0.322 | 0.323 (+0.011 vs szn) |
| K% (lower is better) | 24.4% | 21.8% (+1.2% vs szn) |
Over the last 30 days the Cardinals have been the better offense, 0.323 wOBA to 0.322. They are running hot against their own season line (+0.011 wOBA). White Sox are striking out at 24.4% over the window — something the opposing starter can lean on.
Season profile
Full Stats page →| Metric | White Sox | Cardinals |
|---|---|---|
| Record | 75-72 | 73-75 |
| Run differential / game (team quality) | +0.24 | -0.06 |
| Runs scored / game (offense, season) | 4.69 | 4.56 |
| Runs allowed / game (defense, season, lower better) | 4.45 | 4.62 |
| Season OPS | 0.723 | 0.703 |
| K% season (lower is better) | 24.0% | 20.7% |
| OPS vs opposing hand (season) | 0.718 | 0.713 |
Season-long team quality, not recent form. Run differential and run environment come from the season standings; splits for all 30 teams live on the Stats page, including the run environment table.
The Map
Full interactive map →Every team on today's slate, on any two axes you pick. White Sox and Cardinals are highlighted.
Bullpen matchup
Full Bullpen Fatigue Index →Risk is what the model actually uses: fatigue blended with how well the pen has pitched. High fatigue with high efficiency is a tired pen that is still getting outs.
| Metric | White Sox | Cardinals |
|---|---|---|
| Fatigue | 8.6/10, High risk | 6.5/10, Tired |
| Efficiency | 4.7/10, Average | 3.8/10, Below average |
| Combined risk | 8.8/10, High risk | 7.1/10, Tired |
| Relief innings, last 7 days | 39.7 | 23.3 |
| Back-to-back arms | 2 | 9 |
| 7-day ERA | 4.54 | 5.79 |
| 7-day WHIP | 1.34 | 1.46 |
Fatigue measures workload. Efficiency measures recent run prevention. Combined risk is what the moneyline and totals systems use.
Run total projection
Full Totals Projections →The current model and market total cannot be compared yet. Team totals remain research-only until their graded sample is established.
More games today
All matchups →Every Leo pick, graded in public
Free daily model card by email, or open today's full slate. Membership adds delivery before first pitch.
Model outputs are not guarantees. Leo provides analysis and education only. Every official pick remains visible on the Results page. 21+. If you or someone you know has a gambling problem, call 1-800-GAMBLER.