Jonah Heim creates bases at a better-than-most clip — better than 71% of qualified hitters. The contact is soft, though — only 24% of qualified hitters hit the ball with less authority.
Each spoke is a skill estimate adjusted for sample size — not raw season stats — so farther out = better.
Percentiles vs. 463 qualified hitters.
Data through 2026-07-15.
Plays like…
Same archetype, nearest by rate — the hitters whose profile looks most like this one.
Every plate appearance ends one of three ways: a strikeout (0 bases), a walk (1 base), or a ball in play worth its estimated bases.
The bar splits his value into those pieces, versus the league.
More bases is better. In the table, 100th percentile = best in MLB.
Ball-in-play basesWalk bases
Bases per plate appearance
.387
.072
Jonah Heim
.351
.084
League average
What a replacement bat would have done
over Jonah Heim's 180 plate appearances
83
Jonah Heim
65
Replacement level
▲ +18 bases above replacement (created 83 vs 65)
Jonah Heim
League
Percentile
Bases per ball in play(higher = better)
.536
.510
71st
Walk rate(higher = better)
7%
8%
42nd
Strikeout rate(fewer = better)
19%
23%
68th
Platoon splits
Platoon splits (EB/PA)
Dot = shrunk true-talent estimate; bar = 89% credible interval.
Faint diamond = his raw, unshrunk rate against that hand — small samples make it noisy, which is why the model pulls the dot toward a more trustworthy estimate.
Shrunk splits beat raw splits decisively at low PA counts and converge with them as playing time builds — individual platoon gaps need roughly 1,000+ PA vs a hand before the raw number alone can be trusted.
Jonah Heim switch-hits — he can choose the platoon-advantaged side almost every plate appearance, so a small gap here is expected. It is not missing data or a modeling error.
Headline EB/PA (0.479)
vs LHP83 PA0.480
vs LHP: shrunk estimate 0.480 EB/PA, 89% credible interval 0.424 to 0.541, based on 83 plate appearances. Raw (unshrunk) rate: 0.540 EB/PA.
vs RHP94 PA0.479
vs RHP: shrunk estimate 0.479 EB/PA, 89% credible interval 0.425 to 0.534, based on 94 plate appearances. Raw (unshrunk) rate: 0.394 EB/PA.
Raw vs RHP rate (0.394) is off this scale — small samples like this are exactly why the shrunk estimate (the dot) is the trustworthy number, not the raw one.
0.4100.4460.4830.5190.555
0.002 EB/PA better vs LHP than vs RHP (shrunk estimate).
89% credible interval: -0.040 to +0.043
That interval crosses zero, so the model can’t confidently say which side he’s actually better against.
How he hits
Hits it to Pull most often, and does the most damage to Center.
Best batted balls
Where every ball Jonah Heim put in play landed this season.
Dots are colored by estimated bases (EB) — pale slate (easy out) to dark teal (home-run territory).
Filled dots are hits; hollow rings are outs — a dark ring in the outfield is a crushed ball that got caught.
Hover a dot or a row to link the two; click to watch on Baseball Savant.
