ATL vs MIA prediction for May 21, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects MIA 3.9 - ATL 4.0. MIA is favored with a 52.3% win probability. The run line is 1.5 and the total is 7.5. Model projects 7.8 total runs.
MIA
3.9
Projected Score
VS
O/U 7.5
ATL
4.0
Projected Score
Win Probability
MIAATL
+1.5
Run Line (MIA)
7.5
Total Line
10,000
Simulations
Calibrated accuracy at this confidence: 51.7% (2,221 games)
Projected Runs Range 10th – 90th percentile
ATL
246
MIA
246
Projected
MIA 3.9 — ATL 4.0
Actual
MIA 3 — ATL 9
Starting Pitcher Matchup
Spencer Strider R
ATL
FF48%95 mph16% whiff
SL28%85 mph43% whiff
CU17%79 mph50% whiff
Sandy Alcantara R
MIA
CH23%91 mph34% whiff
SI23%97 mph9% whiff
FF20%97 mph14% whiff
Weather Impact
loanDepot park
84°F11 mph windRoof: retractable
HR: 1.086 Total: 1.048
thin air, 11mph out
Bullpen Comparison
ATL
2.42ERA
2.80FIP
9.92K/9
2.79BB/9
0.99WHIP
MIA
3.58ERA
3.55FIP
9.32K/9
4.61BB/9
1.20WHIP
Betting Edges
RUN_LINE HOME +1.5
-34.5% EV
-152
RUN_LINE AWAY -1.5
-18.3% EV
+126
F5_ML AWAY
-17.8% EV
-130
ML AWAY
-14.4% EV
-135
ML HOME
+9.7% EV
+116
F5_ML HOME
+9.3% EV
+104
First 5 Innings & NRFI
ATL F5
1.9 runs
36.2% win
MIA F5
2.3 runs
46.2% win
F5 Total
4.2
NRFI
58.1%
YRFI
41.9%
Avg 1st Inn Runs
0.85
HR Spotlight
Avg HRs
1.8
Over 0.5 HR
83%
Over 1.5 HR
53%
No HR
17%
Michael Harris II ATL23.2%
ISO: 0.197 | Barrel: 11.3% | vs Sandy Alcantara | Park: 0.93x Platoon: 1.12x
Matt Olson ATL17.9%
ISO: 0.334 | Barrel: 17.4% | vs Sandy Alcantara | Park: 0.93x Platoon: 1.12x
Ozzie Albies ATL17.9%
ISO: 0.141 | Barrel: 8.4% | vs Sandy Alcantara | Park: 0.93x Platoon: 1.12x
Pitcher Strikeout Projections
Spencer Strider
0.0 K projected
ATL | K/9: 0.0
Sandy Alcantara
0.0 K projected
MIA | K/9: 0.0
Injury Report
ATL8 injured
Hurston Waldrep SP60-DAY-IL
Drake Baldwin C10-DAY-IL
Kyle Farmer DH10-DAY-IL
Joe Jimenez RP60-DAY-IL
Spencer Schwellenbach SP60-DAY-IL
Sean Murphy C10-DAY-IL
+2 more
MIA8 injured
Leo Jimenez 3B7-DAY IL
Robby Snelling SP60-DAY-IL
Thomas White SPDAY-TO-DAY
Kemp Alderman RFDAY-TO-DAY
Ronny Henriquez RP60-DAY-IL
Jesus Tinoco RPOUT
+2 more
AI Intelligence Analysis
LEAN +1YELLOW ZONE52.6% WR (n=5)
MIA home ML shows +9.7% edge (50.8% model vs 46.3% market) with strong GREEN zone support (home ML 59.3% WR), driven by home field and Miami's elite bullpen (2.42 ERA) — despite ATL holding a significant pitcher edge with Strider's elite 31% K-rate and B+ stuff versus Alcantara's pedestrian 17.2% K-rate, the home field and bullpen quality combine to give MIA value.
Key Factors
- PITCHER MISMATCH (against model): Strider 31.0% K (elite B+) vs Alcantara 17.2% K (pedestrian C) — 13.8% gap worth ~1.0-1.5 runs, ATL should have advantage
- Bullpen parity: Both teams 2.42 ERA (tied for elite) — no bullpen advantage despite proximity difference
- Home field +4.6pt swing: MIA 52.3% vs ATL 47.7%, standard home advantage
- Weather boost: 84°F Miami, 11 mph out wind, humid, 1.048 total mult — adds ~0.8 runs favorable to home hitters
- GREEN zone home ML: 59.3% WR (n=74), strong historical support for home underdogs
Risk Factors
- Strider elite (31% K, B+ stuff) can neutralize home field and weather — if he performs to grade, ATL wins despite underdog status
- Public money likely heavily on ATL (sharp pitcher) — market may be correctly discounting MIA despite zone value
- Retractable roof closed mitigates some hot weather benefit to MIA
PITCHER MISMATCHGREEN ZONESHARP SUPPORTWEATHER IMPACTHIGH EDGE WARNINGML VALUE
Edge Analysis
Moneyline
MIA 52.3%
-34.5 pts
Run Line
+1.5
-34.5 pts
Total
7.5
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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 →