BAL vs BOS prediction for July 21, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects BOS 5.7 - BAL 5.0. BOS is favored with a 54.3% win probability. The run line is 1.5 and the total is 8.5. Model projects 10.8 total runs.
BOS
5.7
Projected Score
VS
O/U 8.5
BAL
5.0
Projected Score
Win Probability
BOSBAL
+1.5
Run Line (BOS)
8.5
Total Line
10,000
Simulations
Calibrated accuracy at this confidence: 53.9% (2,971 games)
Projected Runs Range 10th – 90th percentile
BAL
357
BOS
468
Starting Pitcher Matchup
Kyle Bradish R
BAL
usagewhiffbar labels show usage · mph
SI33%95 mph9% whiff
SL27%87 mph34% whiff
CU22%85 mph40% whiff
Eduardo Rivera L
BOS
usagewhiffbar labels show usage · mph
FF61%95 mph21% whiff
SL25%88 mph23% whiff
CH14%87 mph29% whiff
Weather Impact
Fenway Park
78°F9 mph wind
HR: 1.031 Total: 1.016
neutral
Bullpen Comparison
BAL
4.34ERA
4.01FIP
8.76K/9
3.44BB/9
1.30WHIP
BOS
3.90ERA
4.18FIP
9.00K/9
3.45BB/9
1.30WHIP
Betting Edges
First 5 Innings & NRFI
BAL F5
2.7 runs
39.1% win
BOS F5
3.2 runs
48.5% win
F5 Total
5.9
NRFI
48.9%
YRFI
51.1%
Avg 1st Inn Runs
1.21
HR Spotlight
Injury Report
BAL8 injured
Samuel Basallo CDAY-TO-DAY
Adley Rutschman C10-DAY-IL
Ryan Helsley RP60-DAY-IL
Chris Bassitt SP60-DAY-IL
Blaze Alexander 3B10-DAY-IL
Keegan Akin RP60-DAY-IL
+2 more
BOS8 injured
Zack Kelly RP60-DAY-IL
Ranger Suarez SP15-DAY-IL
Trevor Story SS60-DAY-IL
Isiah Kiner-Falefa 2B10-DAY-IL
Marcelo Mayer 2B10-DAY-IL
Tanner Houck SP60-DAY-IL
+2 more
AI Intelligence Analysis
LEAN +1
Model 63.3% OVER 8.5 (10.77 total, +15.8% edge) with supporting F5 OVER 4.5 at +8.4% edge (58.6% prob). SP: Rivera (B-, ERA TBD, 8.7 K/9, standard command 0.56) vs Bradish (C+, ERA TBD, 9.0 K/9, command 0.415) — both mediocre but Rivera slight edge. Weather neutral (77.6F) with open roof, Fenway (slight HR bias 1.031x but overall neutral). BAL bullpen weak (4.34 ERA, closer 3.66 ERA), BOS slightly better (3.9 ERA, closer 1.7 ERA) — advantage BOS late-game. 15.8% edge at 63.3% prob is in manageable 15-20% historical support, not extreme. F5 historically well-supported supports early confidence.
Key Factors
- SP analysis: Rivera (B-, 8.7 K/9, command 0.56) vs Bradish (C+, 9.0 K/9, command 0.415) — Rivera better overall grade and command, slight edge Boston home
- Bullpen gap: BOS 3.9 ERA (closer 1.7 elite) vs BAL 4.34 ERA (closer 3.66 mediocre) — 0.4 ERA advantage late game adds ~0.25 runs
- Fenway Park HR factor 1.031x + 77.6F warm + humidity 68% = neutral totals multiplier (~1.016x) — slight overs lean from weather
- F5 OVER 4.5 at +8.4% edge (58.6% prob) = supporting early-game edge, encouraging full-game lean
- BAL lineup includes power hitters (Pete Alonso, Coby Mayo, both 30% HR prob) suggesting run potential despite middle-tier SP quality
Risk Factors
- Both pitchers TBD (no established ERA) = data uncertainty for SP comparison
- historically mixed offers no historical advantage vs breakeven
- Market showing -25.3% edge on UNDER (suggesting smart money leaning under) vs +15.8% on OVER — may indicate model overconfidence
Edge Analysis
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 →