Marlins vs Padres Prediction, September 19, 2026 | Padres moneyline
Eury Pérez vs Casey Mize at Petco Park
Published September 19, 2026 · MLB Prediction Data Lab
The moneyline on Padres at -151 is a run-prevention bet first. Eury Pérez projects 4.04 earned runs allowed across a 5.35-inning start plus relief; Casey Mize projects 3.79. The side that prevents more does not have to outslug anyone.
This is the largest stake on today's card. The other unders the same night load on the same run-environment factor; size the card as one bet, not seven independent shots. Full board: MLB picks today.
The listed matchup
Miami Marlins (76–78) at San Diego Padres (85–69), Petco Park, San Diego. Eury Pérez, a right-hander, is listed for the visitors. Casey Mize, a right-hander, is listed for the home club. Void the play if either listed starter is scratched.
| Side | Listed starter | Record | Park |
|---|---|---|---|
| Marlins | Eury Pérez | 76–78 | Petco Park |
| Padres | Casey Mize | 85–69 | 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. Eury Pérez has faced 602 hitters. Casey Mize has faced 510.
| Starter | BF | K% | BB% | K−BB | K/BB | Pitches/BF |
|---|---|---|---|---|---|---|
| Eury Pérez | 602 | 25.7 | 10.6 | 15.1 | 2.42 | 4.08 |
| Casey Mize | 510 | 21.0 | 6.1 | 14.9 | 3.45 | 3.80 |
| Starter | W-L | ERA | IP | WHIP | K/9 | BB/9 | HR/9 | Opp AVG |
|---|---|---|---|---|---|---|---|---|
| Eury Pérez (R) | 7-11 | 3.99 | 144.1 | 1.24 | 9.67 | 3.99 | 1.12 | .218 |
| Casey Mize (R) | 6-9 | 3.69 | 124.1 | 1.14 | 7.75 | 2.24 | 1.01 | .237 |
Eury Pérez sits at a 3.99 ERA with a 1.24 WHIP and 64 walks in 144.1 innings. Casey Mize sits at a 3.69 ERA with a 1.14 WHIP and 31 walks in 124.1 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.
| Eury Pérez — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-22 | 5.0 | 1 | 4 | 3 | 3 | — | 100 |
| 2026-08-28 | 3.0 | 5 | 5 | 4 | 2 | 1 | 74 |
| 2026-09-02 | 4.2 | 6 | 3 | 3 | 9 | 3 | 102 |
| 2026-09-07 | 4.0 | 5 | 5 | 3 | 10 | — | 92 |
| 2026-09-13 | 5.0 | 3 | 5 | 2 | 4 | 1 | 96 |
| Casey Mize — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-22 | 2.2 | 4 | — | 1 | 4 | 3 | 47 |
| 2026-08-28 | 5.0 | 2 | 1 | 1 | 6 | 1 | 77 |
| 2026-09-02 | 4.0 | 4 | 4 | 1 | 5 | 2 | 85 |
| 2026-09-08 | 5.2 | 3 | 7 | 1 | 4 | 1 | 90 |
| 2026-09-14 | 5.0 | 2 | — | 2 | 8 | — | 75 |
The run environment, before the starters
Marlins have scored 683 runs in 154 games (4.44 per game) with a .727 OPS. Padres have scored 676 in 154 (4.39) with a .716 OPS. The pitching staffs have allowed 4.42 and 4.16 runs per game.
| Club | Record | R/G | OPS | Staff ERA | Staff WHIP | RA/G |
|---|---|---|---|---|---|---|
| Marlins | 76–78 | 4.44 | .727 | 4.12 | 1.29 | 4.42 |
| Padres | 85–69 | 4.39 | .716 | 3.93 | 1.29 | 4.16 |
Reassembling the buckets
Eury Pérez averages 5.35 innings per start. Casey Mize averages 5.18. 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 |
|---|---|---|---|---|---|
| Marlins (Eury Pérez) | 5.35 | 3.99 | 3.65 | 4.12 | 4.04 |
| Padres (Casey Mize) | 5.18 | 3.69 | 3.82 | 3.93 | 3.79 |
| Combined | 7.83 |
A combined 7.83 projected earned runs. 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
Petco Park is listed at 336 feet to left, 386 feet to left center, 396 feet to center, 391 feet to right center, 322 feet to right, on grass, open at 23 feet above sea level with a listed capacity of 40,000. 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
Moneyline edges this thin die when the length assumption fails. If the better starter is out in the fourth, the staff rate takes over and the partition no longer applies.
What would falsify it
A short outing from the starter on the backed side, or a crooked inning against the relief bucket that the partition treats as average, is the miss. The model is only as good as the length assumption of 5.35 and 5.18 innings.
The position
San Diego Padres ML at -151, 3 units. A price of -151 implies a 60.2% break-even. Grade it against this published number. If a listed starter is scratched, the play is void.
- San Diego Padres ML -151 · 3u
Who is on the mound?
Eury Pérez for Marlins. Casey Mize for Padres. 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. Eury Pérez at 15.1 points of K−BB separation versus Casey Mize at 14.9 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.