Vs. pull-fly-ball-prone pitcher (>18%)
1.67× HR rate
330 yes / 118 no · 70 HRs
Vs. high-xwOBA pitcher (xwOBA allowed > .340)
+41%
94 yes / 357 no · 70 HRs
No rest day (B2B or doubleheader)
0.60× HR rate
365 yes / 87 no · 71 HRs
Vs. high-contact-quality pitcher (avg EV allowed ≥ 89 mph)
+33%
196 yes / 255 no · 70 HRs
Batting 3-4-5 in the order
+32%
259 yes / 194 no · 71 HRs
Summer game (Jun-Aug)
+30%
196 yes / 257 no · 71 HRs
Rested (2+ days off)
+30%
19 yes / 433 no · 71 HRs
HR-friendly park (factor ≥ 1.10)
+29%
136 yes / 317 no · 71 HRs
Vs. HR-prone pitcher (HR/PA > 3.8%)
+28%
103 yes / 346 no · 70 HRs
≥2 career HRs vs this pitcher
+26%
15 yes / 438 no · 71 HRs
Opposing starter's recent FB velo down ≥1 mph
−25%
57 yes / 333 no · 61 HRs
Vs. fastball-heavy pitcher (FB% ≥ 55%)
+22%
238 yes / 199 no · 70 HRs
Opposing starter coming off >7 days rest
+22%
75 yes / 354 no · 70 HRs
Cold month (Apr / Sep / Oct)
−21%
133 yes / 320 no · 71 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.