OAK vs ARI prediction for July 20, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects ARI 6.1 - OAK 5.3. ARI is favored with a 56.1% win probability. The run line is -1.5 and the total is 9.0. Model projects 11.4 total runs.
ARI
6.1
Projected Score
VS
O/U 9.0
OAK
5.3
Projected Score
Win Probability
ARIOAK
-1.5
Run Line (ARI)
9.0
Total Line
10,000
Simulations
Calibrated accuracy at this confidence: 56.2% (2,956 games)
Projected Runs Range 10th – 90th percentile
OAK
357
ARI
468
Starting Pitcher Matchup
Jack Perkins R
OAK
usagewhiffbar labels show usage · mph
FF36%96 mph13% whiff
ST30%86 mph34% whiff
CH18%90 mph43% whiff
R TBD
ARI
Weather Impact
Chase Field
105°F9 mph windRoof: retractable
HR: 1.067 Total: 1.033
thin air
Bullpen Comparison
OAK
4.87ERA
3.91FIP
9.81K/9
4.20BB/9
1.44WHIP
ARI
3.28ERA
3.68FIP
8.28K/9
3.10BB/9
1.10WHIP
Betting Edges
First 5 Innings & NRFI
OAK F5
3.0 runs
38.8% win
ARI F5
3.5 runs
49.4% win
F5 Total
6.5
NRFI
49.0%
YRFI
51.0%
Avg 1st Inn Runs
1.19
HR Spotlight
Injury Report
OAK8 injured
Luis Severino SP60-DAY-IL
Denzel Clarke CF60-DAY-IL
Zack Gelof 3B10-DAY-IL
Nick Kurtz 1B10-DAY-IL
Justin Sterner RP15-DAY-IL
Brent Rooker DH60-DAY-IL
+2 more
ARI8 injured
Corbin Carroll RFDAY-TO-DAY
Justin Martinez RP60-DAY-IL
Lourdes Gurriel Jr. LF10-DAY-IL
A.J. Puk RP60-DAY-IL
Jordan Lawlar LF10-DAY-IL
Ryne Nelson SP60-DAY-IL
+2 more
AI Intelligence Analysis
LEAN +1
Model projects 12.15 total (64.7% OVER 9.0) with 19.8% edge. High-edge zone (YELLOW 50.1% WR) but justified: Mitch Bratt (0.141 overall, C-, 2.7 mean Ks = garbage arm) vs Jeffrey Springs (0.421 overall, B-, 7.8 K/9 = solid). AWAY pitcher IS BETTER despite road status. Model favors home (53% win prob) but away pitcher > home pitcher. This is pitcher attribution failure unless model is weighting park factor heavily. Chase Field park factor 1.06 (+6% runs) + heat 104.6F (extreme) + thin air (3491 ft) justify 12.15 total. Lean OVER on reframed 5-10% edge (F5 OVER 5.5 at 26.6% edge shows better signal).
Key Factors
- PITCHER ATTRIBUTION RULE VIOLATION: Model favors ARI home at 53.9%, ARI pitcher (Bratt) is WORSE (0.141 overall C-) than OAK pitcher (Springs 0.421 overall B-). Model thesis must explain: home field dominance (park 1.06 + heat 104.6F) overrides pitcher quality gap. This is plausible at extreme heat + thin air
- Bratt is TERRIBLE (0.141, C-, 2.7 mean Ks, 0.109 stuff score D-grade). Springs is solid (0.421, B-, 7.8 K/9, 0.314 stuff score). Normal model should heavily favor away
- Heat (104.6F = EXTREME, tied for highest on slate) + park 1.06 + thin air 3491 ft create offensive boost. Model total 12.15 is justified by environment, not pitchers
- F5 OVER 5.5 shows 26.6% edge at 59.7% prob — superior risk/reward. F5 is cleaner market signal
- Model-market issue: Model 53.9% home win prob, market 57.1% — market 3.2% sharper on home. Market correctly overweights home field + park factor vs pitcher quality
Risk Factors
- Bratt is so weak (0.141, D-grade stuff) that model may be overestimating home field benefit. Away pitcher (Springs) should dominate despite road status
- 19.8% edge is high; expect ~50% zone WR
- Extreme heat (104.6F) at close to human endurance limit; game may be delayed or abbreviated, reducing scoring
HIGH EDGE WARNINGPITCHER MISMATCHEXTREME HEATPARK FACTORF5 VALUE
Edge Analysis
Moneyline
ARI 56.1%
+14.8 pts
Run Line
-1.5
+14.8 pts
Total
9.0
+12.2 pts
How this prediction was generated: This page shows output from the Olympus Bets MLB Baseball Monte Carlo engine. Each game is simulated 10,000 times using real-time team data, injury reports, and current odds. Probabilities are calibrated using Bayesian methods and sized via the Kelly Criterion. Probabilities are calibrated using Bayesian methods and sized via the Kelly Criterion. Full methodology →