Players · B · Pitcher · 2026

Jonathan Bowlan

Philadelphia Phillies National League East

Age: 30
B/T: R/R
Height: 6' 6"
Weight: 240 lb
Number: #52

Born: December 1, 1996 in Arlington, TN, United States
MLB debut: September 27, 2023
Drafted: 2018, round 2
College: Memphis

dbWAR: .8
IP: 56.1
ERA: 3.36
FIP: 3.37
K/9: 11.7
FIP−: 81

Jonathan Bowlan is a relief pitcher for the Philadelphia Phillies. In 2026 he struck out 73 batters over 56.1 innings across 59 appearances, going 2-2. His ERA of 3.36 is 19.7% lower than the league average of 4.18 — 5th of 17 on his team, and 143rd of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 3.37 FIP suggests the ERA was no fluke. He missed bats on 31.4% of swings (15.7% of every pitch he threw), walked 6.6% of the batters he faced and struck out 31.9%. His 0.9 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.

FIP3.37

K/911.7

WHIP1.03

WAR.9

WAR by season

Pitching

Standard and advanced, by season.


2026	PHI	59	0	56.1	2	2	2	43	21	73	15	3.36	3.37	1.03	11.7	2.4	80	81	0.9
2025	KC	34	1	44.1	1	2	0	37	19	46	17	3.86	3.97	1.22	9.3	3.5	93	95	0.3
2024	KC	1	1	2.2	0	1	0	6	4	3	3	13.50	18.92	3.38	10.1	10.1	331	464	-0.4
2023	KC	2	1	3.0	0	1	0	5	1	3	0	3.00	5.59	1.67	9.0	0.0	69	129	-0.0

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	124	109	20	3	11	37	.183	.266	.284	.254	29.8%
vs RHB	105	99	23	5	4	36	.232	.276	.424	.305	34.3%

Pitch sequencing

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

ShowBatter

Four-seamSliderChangeupSinkerSweeperCurveball

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

Pitch arsenal

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

Season


Four-Seam Fastball	48.3%	463	97.1	2,412	59.8%	37.0%	86	.116	.422
Slider	18.5%	177	86.8	2,488	44.6%	34.8%	46	.174	.546
Changeup	13.3%	128	90.5	1,583	36.7%	29.9%	36	.250	.769
Sinker	11.2%	107	97.2	2,299	48.6%	5.6%	27	.370	.804
Sweeper	7.9%	76	84.8	2,593	31.6%	26.9%	15	.333	1.067

Jonathan Bowlan'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

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Similar players

Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.

Trevor WilliamsWSH

ERA: 3.14
FIP: 3.80
SO: 34
WAR: 0.3

Jack DreyerLAD

ERA: 3.16
FIP: 3.49
SO: 71
WAR: 0.9

Raisel IglesiasATL

ERA: 2.59
FIP: 3.17
SO: 64
WAR: 1.1

Kevin GinkelAZ

ERA: 4.18
FIP: 3.52
SO: 70
WAR: 0.9

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.