Players · K · Pitcher · 2021

Ian Krol

Age: 30
B/T: L/L
Height: 6' 1"
Weight: 210 lb
Number: #46

Born: May 9, 1991 in Hinsdale, IL, United States
MLB debut: June 5, 2013

dbWAR: .9
IP: 18.2
ERA: 4.34
FIP: 3.92
K/9: 8.7
FIP−: 92

Ian Krol was a relief pitcher for the Detroit Tigers. In 2021 he struck out 18 batters over 18.2 innings across 18 appearances, going 0-0. His ERA of 4.34 was 1.7% higher than the league average of 4.27. Stripping out defence, his 3.92 FIP suggests he pitched better than his ERA shows. He missed bats on 23.8% of swings (11.5% of every pitch he threw), walked 9.3% of the batters he faced and struck out 20.9%. 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, 2021.

FIP3.92

K/98.7

WHIP1.66

WAR.2

WAR by season

Pitching

Standard and advanced, by season.


2021	DET	18	18.2	0	0	23	9	18	8	4.34	3.92	1.66	8.7	3.9	102	92	0.2
2018	LAA	1	2.0	0	0	1	0	2	1	0.00	2.66	1.00	9.0	4.5	0	64	0.0
2017	ATL	51	49.0	2	2	50	29	44	21	5.33	5.01	1.45	8.1	3.9	122	115	-0.1
2016	ATL	63	51.0	2	0	54	18	56	13	3.18	2.91	1.31	9.9	2.3	76	69	1.1
2015	DET	33	28.0	2	3	31	18	26	17	5.79	5.17	1.71	8.4	5.5	146	130	-0.3

Batting

Standard and advanced, by season.

																					Trend
2017	ATL	1	1	0	0	0	0	0	0	.000	.000	.000	.000	.000	0.0%	0.0%	.000	-0.3	-123	-0.0
2016	ATL	1	1	0	0	0	0	0	0	.000	.000	.000	.000	.000	0.0%	0.0%	.000	-0.3	-115	-0.0

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2021. 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	26	23	7	0	3	3	.304	.385	.391	.348	11.5%
vs RHB	60	53	16	2	5	15	.302	.356	.509	.368	25.0%

Pitch sequencing

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

ShowBatter

SliderFour-seamSinkerChangeupCurveball

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Pitch arsenal

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

Season


Slider	38.7%	135	87.3	2,415	43.7%	20.5%	40	.350	.956
Four-Seam Fastball	18.3%	64	93.6	2,387	39.1%	15.0%	7	—	—
Sinker	17.2%	60	94.0	2,304	53.3%	17.9%	11	—	—
Changeup	13.5%	47	85.1	1,800	40.4%	35.7%	13	—	—
Curveball	11.5%	40	78.0	2,527	52.5%	38.5%	5	—	—

Ian Krol'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.

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Ian Krol

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.