Cardinals vs Rockies Prediction, September 6, 2026 | Over 11.0
Kyle Leahy vs Tanner Gordon at Coors Field
Published September 6, 2026 · MLB Prediction Data Lab
The posted total is 11.0. Season run rates already sit at 9.25 combined runs, and the partition of starter plus relief earned-run rates still projects 10.03. The over is a statement that tonight's environment is at or above the season mean, not a one-start suppression.
Full slate: MLB picks today, September 6, 2026.
The listed matchup
St. Louis Cardinals (71–72) at Colorado Rockies (55–87), Coors Field, Denver. Kyle Leahy, a right-hander, is listed for the visitors. Tanner Gordon, a right-hander, is listed for the home club. Void the play if either listed starter is scratched.
| Side | Listed starter | Record | Park |
|---|---|---|---|
| Cardinals | Kyle Leahy | 71–72 | Coors Field |
| Rockies | Tanner Gordon | 55–87 | Open, grass |
The two starters, measured per batter faced
Rate statistics expressed per nine innings reward pitchers who work deep. Expressing them as a share of batters faced removes that distortion. Kyle Leahy has faced 545 hitters. Tanner Gordon has faced 383.
| Starter | BF | K% | BB% | K−BB | K/BB | Pitches/BF |
|---|---|---|---|---|---|---|
| Kyle Leahy | 545 | 21.7 | 7.0 | 14.7 | 3.11 | 3.92 |
| Tanner Gordon | 383 | 18.8 | 4.2 | 14.6 | 4.50 | 3.51 |
| Starter | W-L | ERA | IP | WHIP | K/9 | BB/9 | HR/9 | Opp AVG |
|---|---|---|---|---|---|---|---|---|
| Kyle Leahy (R) | 10-4 | 3.13 | 129.1 | 1.31 | 8.21 | 2.64 | 0.90 | .263 |
| Tanner Gordon (R) | 1-4 | 5.18 | 88.2 | 1.40 | 7.31 | 1.62 | 1.73 | .301 |
Kyle Leahy sits at a 3.13 ERA with a 1.31 WHIP and 38 walks in 129.1 innings. Tanner Gordon sits at a 5.18 ERA with a 1.40 WHIP and 16 walks in 88.2 innings. Walks stabilize faster than earned runs, so the walk column is the more trustworthy August reading.
Direction inside the season
Season aggregates hide the last month. These are the prior starts, excluding today's outing so the table does not leak a result into a published prediction.
| Kyle Leahy — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-07 | 5.0 | 2 | 8 | — | 8 | — | 82 |
| 2026-08-12 | 5.0 | 1 | 6 | — | 6 | — | 81 |
| 2026-08-18 | 5.0 | 0 | 6 | — | 3 | — | 90 |
| 2026-08-23 | 4.0 | 0 | 4 | 2 | 2 | — | 63 |
| 2026-08-29 | 3.0 | 1 | 3 | 1 | 4 | 1 | 51 |
| Tanner Gordon — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-09 | 3.1 | 2 | 2 | — | 4 | — | 48 |
| 2026-08-15 | 4.0 | 0 | 4 | — | 3 | — | 63 |
| 2026-08-21 | 5.1 | 5 | 2 | 2 | 9 | 1 | 82 |
| 2026-08-26 | 7.0 | 1 | 5 | — | 6 | 1 | 90 |
| 2026-08-31 | 5.0 | 1 | 3 | 1 | 3 | — | 60 |
The run environment, before the starters
Cardinals have scored 647 runs in 143 games (4.52 per game) with a .702 OPS. Rockies have scored 671 in 142 (4.73) with a .740 OPS. The pitching staffs have allowed 4.60 and 5.70 runs per game.
| Club | Record | R/G | OPS | Staff ERA | Staff WHIP | RA/G |
|---|---|---|---|---|---|---|
| Cardinals | 71–72 | 4.52 | .702 | 4.29 | 1.35 | 4.60 |
| Rockies | 55–87 | 4.73 | .740 | 5.44 | 1.52 | 5.70 |
Reassembling the buckets
Kyle Leahy averages 4.97 innings per start. Tanner Gordon averages 11.08. Weight each starter's own earned run average across that length, then hand the remainder of the nine innings to his club's season staff rate. That is a conservative relief proxy — it mixes rotation and bullpen — and it is stated as a limitation, not hidden.
| Side | Starter IP | Starter ERA | Relief IP | Staff ERA | Projected ER |
|---|---|---|---|---|---|
| Cardinals (Kyle Leahy) | 4.97 | 3.13 | 4.03 | 4.29 | 3.65 |
| Rockies (Tanner Gordon) | 11.08 | 5.18 | 0.00 | 5.44 | 6.38 |
| Combined | 10.03 |
A combined 10.03 projected earned runs against a 11.0 total. Unearned runs are ignored. Neither starter hits his average length every night. The opposing lineups are not in the formula; they sit in the table above.
The park
Coors Field is listed at 347 feet to left, 420 feet to left center, 415 feet to center, 424 feet to right center, 350 feet to right, on grass, open at 5190 feet above sea level with a listed capacity of 50,480. Park dimensions do not decide a total by themselves. They decide whether a walk plus a ball in the air becomes two runs or a long out.
Where this reading is weakest
If both starters hit their season length and staff rates hold, the partition sits at 10.03 earned runs. That is not automatically above 11.0 once unearned runs and sequencing are stripped out.
What would falsify it
Two starters working into the seventh with fewer than two walks combined would be the clearest miss. An over at 11.0 needs traffic and innings that leak.
The position
Rockies/Cardinals Over 11 at -110, 1 units. A price of -110 implies a 52.4% break-even. Grade it against this published number. If a listed starter is scratched, the play is void.
- Rockies/Cardinals Over 11 -110 · 1u
Who is on the mound?
Kyle Leahy for Cardinals. Tanner Gordon for Rockies. Those names come from the MLB probable-pitcher feed, not from a guessed rotation.
Why use batters-faced rates instead of ERA?
Earned run average is a counting result. Strikeout and walk rates as a share of batters faced describe the process that produced it, and they stabilize on a smaller sample. Kyle Leahy at 14.7 points of K−BB separation versus Tanner Gordon at 14.6 is the comparison ERA hides.
How is the pick graded?
Against the published price, on the public record. Pending is not a win. Today's full card lives at a stable URL: mlb-picks.html.
Pick, odds, and unit size come from the BetLegend daily tracker. Probable starters, season rates, and venue facts are from the MLB Stats API. Educational analysis. 18+ only. 1-800-GAMBLER.