Players · F · Pitcher · 2021 regular season

Jay Flaa

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

Born: June 10, 1992 in Bismarck, ND, United States
MLB debut: April 27, 2021

dbWAR: -.3
IP: 2.2
ERA: 13.50
FIP: 14.05
K/9: 10.1
FIP−: 329

Jay Flaa was a relief pitcher for the Atlanta Braves. In 2021 he struck out 3 batters over 2.2 innings across 2 appearances, going 0-0. His ERA of 13.50 was 216.5% higher than the league average of 4.27. Stripping out defence, his 14.05 FIP suggests that his ERA had some help behind him. He missed bats on 42.3% of swings (18.0% of every pitch he threw), walked 23.1% of the batters he faced and struck out 23.1%. His -0.3 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 regular season.

FIP14.05

K/910.1

WHIP2.25

WAR-.3

Pitching Regular season

Standard and advanced, by season. Regular-season games only.

																				Trend
2021	BAL/ATL	2	0	2.2	0	0	0	3	4	3	3	13.50	14.05	2.25	10.1	10.1	316	329	-0.3	—

Platoon splits

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

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	5	4	2	2	1	1	.500	.600	2.000	.939	20.0%
vs RHB	8	6	1	0	2	2	.167	.375	.167	.291	25.0%

Pitch sequencing

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

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Four-seamChangeupCurveball

Select a count to see exactly what Jay Flaa throws in it.

Pitch arsenal

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


Four-Seam Fastball	60.7%	37	91.7	2,053	43.2%	26.7%	5	—	—
Changeup	23.0%	14	84.4	726	35.7%	57.1%	4	—	—

Jay Flaa'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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Jay Flaa

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.