DataBaseball
2026
Kohei Arihara headshot

Players · A · Pitcher · 2022

Kohei Arihara

Age
30
B/T
R/R
Height
6' 2"
Weight
210 lb
Born
August 11, 1992 in Hiroshima, Japan
MLB debut
April 3, 2021
dbWAR
-1.1
3 season(s)
IP
20.0
ERA
9.45
FIP
6.41
K/9
6.3
FIP−
162
100 = avg

Kohei Arihara was a starting pitcher for the Texas Rangers. In 2022 he struck out 14 batters over 20.0 innings across 5 appearances, 4 of them starts, going 1-3. His ERA of 9.45 was 138.1% higher than the league average of 3.97 — the worst on his team, and the second worst among MLB pitchers with 20+ innings. Stripping out defence, his 6.41 FIP suggests he pitched better than his ERA shows. He missed bats on 21.6% of swings (10.3% of every pitch he threw), walked 10.2% of the batters he faced and struck out 13.0%. His -0.4 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, 2022.

FIP6.41
K/96.3
WHIP2.35
WAR-.4

WAR by season

0.0-0.3-0.72122

Pitching

Standard and advanced, by season.

Trend
2022TEX5420.0130362114119.456.412.356.35.0238162-0.4
2021TEX101040.2240453024136.646.761.435.32.9156158-0.7

Batting

Standard and advanced, by season.

Trend
2021TEX12000001.000.000.000.000.0000.0%50.0%.000-0.5-121-0.0—

Platoon splits

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

Opponent batting by the side the hitter bats from, 2022. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB514616247.348.412.565.42413.7%
vs RHB574720277.426.518.723.52912.3%

Pitch sequencing

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

ShowBatter
CutterSinkerChangeupSliderSplitterFour-seam

Select a count to see exactly what Kohei Arihara throws in it.

Pitch arsenal

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

Cutter25.4%9988.02,13639.4%16.0%24.4171.396
Sinker24.9%9790.52,05936.1%11.4%15.6671.656
Changeup20.8%8181.21,40740.7%32.5%18.222.652
Slider14.4%5681.72,12433.9%14.3%17.4121.059
Splitter11.3%4482.71,42545.5%38.5%16.188.465
Four-Seam Fastball3.1%1292.12,19558.3%16.7%3——
Kohei Arihara'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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Kohei Arihara

Similar players

Nearest 2022 seasons by command, run prevention and role, on rate statistics rather than totals.

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.