SD vs BOS prediction for April 4, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects BOS 3.8 - SD 3.5. BOS is favored with a 55.6% win probability. The run line is -1.5 and the total is 7.5. Model projects 7.3 total runs.
BOS
3.8
Projected Score
VS
O/U 7.5
SD
3.5
Projected Score
Win Probability
BOSSD
-1.5
Run Line (BOS)
7.5
Total Line
10,000
Simulations
SD W4BOS L5
Calibrated accuracy at this confidence: 53.6% (2,040 games)
Projected Runs Range 10th – 90th percentile
SD
245
BOS
246
Pick Results
Connelly Early OVER 4.5 Ksk_propsLOSS-1.00u
Starting Pitcher Matchup
Randy Vásquez R
SD
FC24%90 mph17% whiff
FF21%94 mph16% whiff
SI19%93 mph6% whiff
Connelly Early L
BOS
FF31%94 mph18% whiff
CH19%84 mph23% whiff
CU18%81 mph33% whiff
Weather Impact
Fenway Park
44°F14 mph wind
HR: 1.047 Total: 1.031
14mph out
Bullpen Comparison
SD
2.80ERA
3.31FIP
9.46K/9
3.41BB/9
1.09WHIP
BOS
3.75ERA
3.71FIP
9.75K/9
5.38BB/9
1.33WHIP
Betting Edges
RUN_LINE AWAY +1.5
-41.4% EV
-182
TOTAL OVER 7.5
-15.2% EV
-110
F5_ML HOME
-9.6% EV
-167
TOTAL UNDER 7.5
+8.4% EV
-110
F5 UNDER 4.5
+5.8% EV
-139
RUN_LINE HOME -1.5
-5.2% EV
+150
First 5 Innings & NRFI
SD F5
1.9 runs
37.4% win
BOS F5
2.1 runs
44.7% win
F5 Total
4.0
NRFI
60.8%
YRFI
39.2%
Avg 1st Inn Runs
0.78
HR Spotlight
Avg HRs
1.6
Over 0.5 HR
80%
Over 1.5 HR
47%
No HR
20%
Wilyer Abreu BOS50.0%
ISO: 0.237 | Barrel: 20.0% | vs Randy Vásquez | Park: 1.08x Platoon: 1.12x
Willson Contreras BOS23.1%
ISO: 0.182 | Barrel: 6.5% | vs Randy Vásquez | Park: 1.08x
Marcelo Mayer BOS22.5%
ISO: 0.198 | Barrel: 22.2% | vs Randy Vásquez | Park: 1.08x Platoon: 1.12x
Pitcher Strikeout Projections
Randy Vásquez
0.0 K projected
SD | K/9: 0.0
Connelly Early
0.0 K projected
BOS | K/9: 0.0
Injury Report
SD8 injured
Griffin Canning SP15-DAY-IL
Jason Adam RP15-DAY-IL
Joe Musgrove SP15-DAY-IL
Sung-Mun Song 3B10-DAY-IL
Matt Waldron SP15-DAY-IL
Yu Darvish SPOUT
+2 more
BOS8 injured
Triston Casas 1B10-DAY-IL
Johan Oviedo SP15-DAY-IL
Garrett Whitlock RPPATERNITY
Kutter Crawford SP15-DAY-IL
Patrick Sandoval SP15-DAY-IL
Brendan Rodgers 2BOUT
+2 more
AI Intelligence Analysis
LEANGREEN ZONE58.9% WR (n=113)
BOS market 7.5 UNDER with model 56.8% (8.4% edge). Connelly Early (B+, 1.83 ERA, 34.5% K) is elite home arm facing Vásquez (C+, 0.0 ERA, 14.8% K — likely rookie/no sample). Cold (43.9F) but 14mph wind OUT (+14 tail wind) = 3.1% run boost per weather data. Model projects 7.26 total vs market 7.5 = marginal 0.24 run gap. Conflicting signals: weather favors OVER, pitcher favors UNDER.
Key Factors
- UNDER edge: 8.4% (model 56.8% vs ~50% market) — but marginal on actual runs (7.26 vs 7.5)
- Pitching: Early (1.83 ERA, elite) vs Vásquez (0.0 ERA, unknown sample) — quality advantage to BOS but Vásquez data suspect
- Weather paradox: 14mph tailwind FAVORS runs (Fenway already HR-friendly park; +4.7% HR multiplier), but cold 43.9F suppresses slightly
- Park factor: Fenway 1.031 total multiplier = +3.1% runs from baseline; conflicts with under thesis
- F5 UNDER edge: 5.8% — weak secondary signal
Risk Factors
- Randy Vásquez ERA 0.0 is red flag — either new call-up or data quality issue; model may be anchoring to wrong baseline
- Fenway wind assists are overweighted in some models; 14mph tailwind helps fly balls but not necessarily walk-off singles
- Cold weather (43.9F) does suppress runs, but not enough to overcome Fenway bias toward overs
PITCHER MISMATCHWEATHER CONFLICTTBD PITCHERDATA QUALITY
Edge Analysis
Moneyline
BOS 55.6%
-5.2 pts
Run Line
-1.5
-5.2 pts
Total
7.5
+8.4 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. Full methodology →