Orioles vs Athletics Prediction, August 29, 2026 | Orioles moneyline
Shane Baz vs Jack Perkins at Sutter Health Park
Published August 29, 2026 · MLB Prediction Data Lab
The moneyline on Orioles at -129 is a run-prevention bet first. Shane Baz projects 4.09 earned runs allowed across a 5.82-inning start plus relief; Jack Perkins projects 6.57. The side that prevents more does not have to outslug anyone.
Full slate: MLB picks today, August 29, 2026.
The listed matchup
Baltimore Orioles (66–69) at Athletics (53–82), Sutter Health Park, Sacramento. Shane Baz, a right-hander, is listed for the visitors. Jack Perkins, a right-hander, is listed for the home club. Void the play if either listed starter is scratched.
| Side | Listed starter | Record | Park |
|---|---|---|---|
| Orioles | Shane Baz | 66–69 | Sutter Health Park |
| Athletics | Jack Perkins | 53–82 | 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. Shane Baz has faced 645 hitters. Jack Perkins has faced 411.
| Starter | BF | K% | BB% | K−BB | K/BB | Pitches/BF |
|---|---|---|---|---|---|---|
| Shane Baz | 645 | 20.9 | 8.1 | 12.9 | 2.60 | 3.83 |
| Jack Perkins | 411 | 25.3 | 9.2 | 16.1 | 2.74 | 3.88 |
| Starter | W-L | ERA | IP | WHIP | K/9 | BB/9 | HR/9 | Opp AVG |
|---|---|---|---|---|---|---|---|---|
| Shane Baz (R) | 4-14 | 4.04 | 151.1 | 1.35 | 8.03 | 3.09 | 0.65 | .264 |
| Jack Perkins (R) | 3-9 | 6.68 | 90.1 | 1.48 | 10.36 | 3.79 | 1.69 | .267 |
Shane Baz sits at a 4.04 ERA with a 1.35 WHIP and 52 walks in 151.1 innings. Jack Perkins sits at a 6.68 ERA with a 1.48 WHIP and 38 walks in 90.1 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.
| Shane Baz — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-01 | 6.1 | 1 | 4 | 1 | 6 | — | 99 |
| 2026-08-07 | 8.0 | 2 | 9 | 1 | 3 | 1 | 93 |
| 2026-08-12 | 3.0 | 5 | 2 | 1 | 9 | — | 65 |
| 2026-08-18 | 6.1 | 3 | 10 | 2 | 4 | 1 | 104 |
| 2026-08-23 | 5.2 | 3 | 3 | 3 | 5 | — | 96 |
| Jack Perkins — last starts | IP | ER | K | BB | H | HR | Pitches |
|---|---|---|---|---|---|---|---|
| 2026-08-01 | 5.1 | 6 | 9 | 1 | 9 | 3 | 91 |
| 2026-08-07 | 3.0 | 5 | 3 | 3 | 5 | 1 | 70 |
| 2026-08-12 | 5.0 | 6 | 2 | 1 | 12 | 1 | 97 |
| 2026-08-18 | 3.2 | 0 | 4 | 1 | 1 | — | 53 |
| 2026-08-23 | 5.0 | 1 | 6 | 5 | 3 | 1 | 91 |
The run environment, before the starters
Orioles have scored 613 runs in 135 games (4.54 per game) with a .716 OPS. Athletics have scored 588 in 135 (4.36) with a .720 OPS. The pitching staffs have allowed 4.71 and 5.73 runs per game.
| Club | Record | R/G | OPS | Staff ERA | Staff WHIP | RA/G |
|---|---|---|---|---|---|---|
| Orioles | 66–69 | 4.54 | .716 | 4.19 | 1.34 | 4.71 |
| Athletics | 53–82 | 4.36 | .720 | 5.43 | 1.50 | 5.73 |
Reassembling the buckets
Shane Baz averages 5.82 innings per start. Jack Perkins averages 8.21. 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 |
|---|---|---|---|---|---|
| Orioles (Shane Baz) | 5.82 | 4.04 | 3.18 | 4.19 | 4.09 |
| Athletics (Jack Perkins) | 8.21 | 6.68 | 0.79 | 5.43 | 6.57 |
| Combined | 10.66 |
A combined 10.66 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
Sutter Health Park is listed at 330 feet to left, 380 feet to left center, 403 feet to center, 380 feet to right center, 325 feet to right, on grass, open at 24 feet above sea level with a listed capacity of 14,111. 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 5.82 and 8.21 innings.
The position
Baltimore Orioles Moneyline at -129, 2 units. A price of -129 implies a 56.3% break-even. Grade it against this published number. If a listed starter is scratched, the play is void.
- Baltimore Orioles Moneyline -129 · 2u
Who is on the mound?
Shane Baz for Orioles. Jack Perkins for Athletics. 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. Shane Baz at 12.9 points of K−BB separation versus Jack Perkins at 16.1 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.