Players · H · Pitcher · 2026

Jonathan Heasley

Age: 29
B/T: R/R
Height: 6' 3"
Weight: 225 lb
Number: #68

Born: January 27, 1997 in Charlotte, NC, United States
MLB debut: September 17, 2021
Drafted: 2018, round 13
College: Oklahoma State
High school: Prestonwood Christian Academy

dbWAR: -1.7
IP: 4.0
ERA: 11.25
FIP: 8.60
K/9: 4.5
FIP−: 206

Jonathan Heasley is a relief pitcher for the Tampa Bay Rays. In 2026 he struck out 2 batters over 4.0 innings across 1 appearance, going 0-0. His ERA of 11.25 is 169.3% higher than the league average of 4.18. Stripping out defence, his 8.60 FIP suggests he pitched better than his ERA shows. He missed bats on 7.9% of swings (4.7% of every pitch he threw), walked 0.0% of the batters he faced and struck out 10.5%. His -0.2 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.

League context

Percentile among qualified pitchers, 2026.

FIP8.60

K/94.5

WHIP2.00

WAR-.2

WAR by season

Pitching

Standard and advanced, by season.


2026	TB	1	0	4.0	0	0	8	5	2	0	11.25	8.60	2.00	4.5	0.0	269	206	-0.2
2024	BAL	4	0	5.1	0	1	10	10	4	3	16.88	8.79	2.44	6.8	5.1	414	216	-0.3
2023	KC	12	0	15.0	0	0	17	12	9	2	7.20	6.99	1.27	5.4	1.2	166	161	-0.3
2022	KC	21	21	104.0	4	10	108	61	70	47	5.28	5.67	1.49	6.1	4.1	133	143	-0.8
2021	KC	3	3	14.2	1	1	15	8	6	3	4.91	6.03	1.23	3.7	1.8	115	141	-0.1

Platoon splits

How left- and right-handed hitters fare against him.

Season

Opponent batting by the side the hitter bats from, 2026. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	8	8	5	1	0	1	.625	.625	1.125	.745	12.5%
vs RHB	11	11	3	1	0	1	.273	.273	.636	.379	9.1%

Pitch sequencing

What Jonathan Heasley throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

Four-seamSliderChangeupCurveball

Select a count to see exactly what Jonathan Heasley throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Season


Four-Seam Fastball	39.1%	25	91.4	2,100	52.0%	5.3%	10	—	—
Slider	32.8%	21	83.2	2,018	38.1%	10.0%	4	—	—
Changeup	18.8%	12	84.2	1,314	50.0%	16.7%	3	—	—

Jonathan Heasley's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

Put Jonathan Heasley beside up to three others.

Compare — add up to 3 more players

Jonathan Heasley

How these are computed

wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.