MLB Baseball

ARI vs COL Prediction

September 23, 2026

10,000 Monte Carlo simulations

FINAL: COL 3 — ARI 5. Our Monte Carlo simulation projected COL 6.1 - ARI 6.4 (ARI at 50.0% win probability). The run line is 1.5 and the total is 11.0. Model projects 12.5 total runs.

COL
6.1
Projected Score
VS O/U 11.0
ARI
6.4
Projected Score
Win Probability
50.0%
50.0%
COLARI
+1.5
Run Line (COL)
11.0
Total Line
10,000
Simulations
ARICOL L5
☑ Calibrated accuracy at this confidence: 48.5% (4,029 games)

Projected Runs Range 10th – 90th percentile

ARI
468
COL
468
FINALCOL 3 — ARI 5
Projected
COL 6.1 — ARI 6.4
Actual
COL 3 — ARI 5

Pick Results

COL MLmlLOSS-0.50u
COL MLmlLOSS-0.50u

Starting Pitcher Matchup

Merrill Kelly R
ARI
FF28% · 92
CH28% · 88
FC13% · 91
usagewhiffbar labels show usage · mph
FF28%92 mph12% whiff
CH28%88 mph28% whiff
FC13%91 mph11% whiff
Mason Adams R
COL
FF32% · 93
SI26% · 92
CU18% · 82
usagewhiffbar labels show usage · mph
FF32%93 mph18% whiff
SI26%92 mph6% whiff
CU18%82 mph44% whiff

Weather Impact

Coors Field
64°F7 mph wind
HR: 1.151 Total: 1.077
thin air, 7mph out

Bullpen Comparison

ARI
3.13ERA
3.45FIP
8.07K/9
2.93BB/9
1.12WHIP
COL
4.77ERA
4.27FIP
7.81K/9
4.17BB/9
1.49WHIP

Betting Edges

NRFI NRFI
-13.6% EV
+116
TOTAL OVER 11.0
+9.8% EV
-103
ML AWAY
-9.8% EV
-164
RUN_LINE AWAY -1.5
-9.7% EV
-108
ML HOME
+9.4% EV
+149
F5_ML AWAY
-9.0% EV
-132

First 5 Innings & NRFI

ARI F5
3.9 runs
45.1% win
COL F5
3.8 runs
44.4% win
F5 Total
7.7
NRFI
38.1%
YRFI
61.9%
Avg 1st Inn Runs
1.65

HR Spotlight

Avg HRs
3.3
Over 0.5 HR
96%
Over 1.5 HR
83%
No HR
4%
Hunter Goodman COL30.0%
ISO: 0.294 | Barrel: 16.2% | vs Merrill Kelly | Park: 1.18x
Lars Nootbaar ARI28.5%
ISO: 0.150 | Barrel: 7.0% | vs Mason Adams | Park: 1.18x Platoon: 1.12x
Ketel Marte ARI27.0%
ISO: 0.158 | Barrel: 9.3% | vs Mason Adams | Park: 1.18x Platoon: 1.12x

Pitcher Strikeout Projections

Merrill Kelly
0.0 K projected
ARI | K/9: 0.0
Mason Adams
0.0 K projected
COL | K/9: 0.0

Injury Report

ARI5 injured
Tyler Locklear 1B60-DAY-IL
Ryan Thompson RP60-DAY-IL
A.J. Puk RP60-DAY-IL
Andrew Saalfrank RP60-DAY-IL
Cristian Mena RP60-DAY-IL
COL7 injured
Willi Castro 2B10-DAY-IL
Chase Dollander SP60-DAY-IL
Welinton Herrera RP60-DAY-IL
McCade Brown SP60-DAY-IL
RJ Petit RP60-DAY-IL
Pierson Ohl RP60-DAY-IL
+1 more

AI Intelligence Analysis

LEAN +1
Coors Field's extreme park factor (1.18, +18% runs) combined with warm weather and thin air genuinely overwhelms two mediocre starters (Adams 5.5 ERA, Kelly 5.4 ERA), supporting OVER 11.0 — but the 13.6% edge size still warrants a reduced position given known model overconfidence at high edges.

Key Factors

  • Coors Field park factor 1.18 is the most extreme run environment in MLB — this is a genuine outlier, not model noise
  • Weather: 79.2F warm, thin air (2675 density altitude), rare favorable tail wind +3.1 — all factors compound toward more scoring
  • Neither starter (Adams 5.5 ERA, Kelly 5.4 ERA) can suppress this kind of environment
  • Model total 13.09 vs market 11.0 (+2.09 gap) reflects Coors' known tendency to run hotter than market numbers suggest

Risk Factors

  • 13.6% edge is within the historically weaker high-edge bucket — reduce sizing even though Coors is a legitimate exception case
  • Depleted ARI bullpen (multiple relievers on 60-day IL) adds unpredictability to late innings

Edge Analysis

Moneyline
ARI 50.0%
+4.8 pts
Run Line
+1.5
+4.8 pts
Total
11.0
+9.8 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 →
Permanent record: this game page is retired 90 days after the event. The full graded MLB 2026 record — every pick, win rate, units and ROI — lives on the MLB 2026 season report card.

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