No rest day (B2B or doubleheader)tonight
1.57× HR rate
359 yes / 110 no · 75 HRs
Platoon advantage (LHB-vs-RHP or RHB-vs-LHP)
+47%
105 yes / 225 no · 54 HRs
Vs. high-xwOBA pitcher (xwOBA allowed > .340)
+40%
96 yes / 371 no · 75 HRs
Rested (2+ days off)
0.61× HR rate
27 yes / 442 no · 75 HRs
Playing at hometonight
+37%
241 yes / 229 no · 75 HRs
HR-suppressing park (factor ≤ 0.95)
0.64× HR rate
42 yes / 426 no · 75 HRs
Vs. hittable pitcher (BAA > .260)
+32%
96 yes / 372 no · 75 HRs
Vs. fly-ball-prone pitcher (FB% allowed > 40%)tonight
−30%
61 yes / 406 no · 75 HRs
Vs. HR-prone pitcher (HR/PA > 3.8%)tonight
+29%
94 yes / 372 no · 74 HRs
First-pitch temperature > 78°F
−27%
93 yes / 350 no · 74 HRs
Vs. pull-fly-ball-prone pitcher (>18%)
−27%
358 yes / 109 no · 75 HRs
Hot streak (L5 avg EV > career baseline)tonight
+27%
177 yes / 288 no · 74 HRs
Vs. high-contact-quality pitcher (avg EV allowed ≥ 89 mph)tonight
+24%
203 yes / 265 no · 75 HRs
≥1 career HR vs this pitcher
−23%
62 yes / 408 no · 75 HRs
Opposing starter's recent FB velo down ≥1 mph
−22%
46 yes / 353 no · 63 HRs
Cold month (Apr / Sep / Oct)tonight
−21%
132 yes / 338 no · 75 HRs
// LIFT = P(HR | factor true) ÷ P(HR | factor false), Bayesian- shrunk with K=30 pseudo-games. Significance requires |lift − 1| ≥ 0.20 AND smaller cohort n ≥ 15. Cohort = top 60 HR hitters, last 2 seasons. Refreshed weekly. Green/red = the factor's effect on tonight's HR chance; gray = not in play tonight.