Players · A · Pitcher · 2026

Robby Ahlstrom

Age: 27
B/T: L/L
Height: 6' 3"
Weight: 195 lb
Number: #54

Born: June 18, 1999 in Placerville, CA, United States
MLB debut: June 3, 2026
Drafted: 2021, round 7
College: Oregon

dbWAR: -.2
IP: 37.0
ERA: 6.08
FIP: 5.18
K/9: 8.3
FIP−: 124

Robby Ahlstrom is a relief pitcher for the Texas Rangers. In 2026 he struck out 34 batters over 37.0 innings across 42 appearances, going 3-1. His ERA of 6.08 is 45.6% higher than the league average of 4.18 — the worst on his team, and 490th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 5.18 FIP suggests he pitched better than his ERA shows. He missed bats on 25.6% of swings (12.2% of every pitch he threw), walked 9.1% of the batters he faced and struck out 20.7%. 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.

FIP5.18

K/98.3

WHIP1.43

WAR-.2

Pitching

Standard and advanced, by season.

																				Trend
2026	TEX	42	0	37.0	3	1	0	38	25	34	15	6.08	5.18	1.43	8.3	3.6	146	124	-0.2	—

Platoon splits

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

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	79	74	20	3	2	19	.270	.299	.419	.314	24.1%
vs RHB	85	70	18	4	13	15	.257	.388	.514	.385	17.6%

Pitch sequencing

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

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Four-seamSliderSinkerChangeupCurveball

Select a count to see exactly what Robby Ahlstrom throws in it.

Pitch arsenal

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


Four-Seam Fastball	32.6%	211	94.4	2,182	46.4%	30.0%	31	.290	.969
Slider	25.8%	167	85.9	2,335	45.5%	36.3%	44	.205	.725
Sinker	22.2%	144	94.4	2,093	50.7%	14.3%	34	.294	.675
Changeup	15.7%	102	86.7	1,324	39.2%	21.2%	32	.250	.781
Curveball	3.7%	24	81.0	2,599	37.5%	10.0%	4	—	—

Robby Ahlstrom'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 Robby Ahlstrom beside up to three others.

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Robby Ahlstrom

Similar players

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

Dennis SantanaPIT

ERA: 5.43
FIP: 5.17
SO: 49
WAR: -0.2

Very close

Jimmy HergetCOL

ERA: 5.70
FIP: 5.39
SO: 47
WAR: -0.3

Very close

Ron MarinaccioSD

ERA: 6.09
FIP: 5.69
SO: 48
WAR: -0.7

Very close

Mitchell ParkerWSH

ERA: 6.58
FIP: 5.47
SO: 34
WAR: -0.3

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.