DataBaseball
2026
Stephen Gonsalves headshot

Pitcher · 2021

Stephen Gonsalves

Age
27
B/T
L/L
Height
6' 5"
Weight
218 lb
Born
July 8, 1994 in San Diego, CA, USA
MLB debut
August 20, 2018
dbWAR
-.2
2 season(s)
IP
4.1
ERA
4.15
FIP
3.40
K/9
8.3
FIP−
80
100 = avg

Stephen Gonsalves is a relief pitcher for the Boston Red Sox. In 2021 he struck out 4 batters over 4.1 innings across 3 appearances, going 0-0. His ERA of 4.15 was 2.6% lower than the league average of 4.27. Stripping out defence, his 3.40 FIP suggests he pitched better than his ERA shows. He missed bats on 28.6% of swings (14.6% of every pitch he threw), walked 11.1% of the batters he faced and struck out 22.2%. His 0.1 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.

FIP3.40
K/98.3
WHIP0.92
WAR.1

Pitching

Standard and advanced, by season.

Trend
2021304.100022424.153.400.928.34.297800.1
20187424.2220281816226.575.712.035.88.0158138-0.2

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.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB981013.125.222.125.17833.3%
vs RHB971011.143.333.286.30311.1%

Pitch sequencing

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

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Four-seamCurveballSlider

Select a count to see exactly what Stephen Gonsalves throws in it.

Pitch arsenal

What he throws, how hard, and how often it misses in 2021.

Four-Seam Fastball51.2%4292.82,35442.9%21.7%
Curveball28.0%2372.32,37056.5%37.5%
Slider18.3%1583.32,29046.7%30.0%
Stephen Gonsalves'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.

Head to head

Put Stephen Gonsalves beside up to three others.

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Stephen Gonsalves
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.