DataBaseball
2026
Mike Fiers headshot

Players · F · Pitcher · 2021 regular season

Mike Fiers

Age
36
B/T
R/R
Height
6' 2"
Weight
211 lb
Born
June 15, 1985 in Hollywood, FL, United States
MLB debut
September 14, 2011

Compare with…

dbWAR
7.9
Regular season, 16 season(s)
IP
9.1
ERA
7.71
FIP
8.96
K/9
4.8
FIP−
210
100 = avg

Mike Fiers was a starting pitcher for the Oakland Athletics. In 2021 he struck out 5 batters over 9.1 innings across 2 appearances, 2 of them starts, going 0-2. His ERA of 7.71 was 80.8% higher than the league average of 4.27. Stripping out defence, his 8.96 FIP suggests that his ERA had some help behind him. He missed bats on 11.3% of swings (5.3% of every pitch he threw), walked 8.9% of the batters he faced and struck out 11.1%. 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, 2021 regular season.

FIP8.96
K/94.8
WHIP2.04
WAR-.4

WAR by season

3.01.1-0.71112131415161718192021

Pitching Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.

Trend
2021OAK229.1020158547.718.962.044.83.9181210-0.4
2020OAK111159.0630653037164.584.941.375.62.41031110.4
2019OAK3333184.2154016680126533.904.971.196.12.6871101.2
2018DET/OAK3130172.0128016668139373.564.751.187.31.9861140.8
2017HOU2928153.1810015789146625.225.431.438.63.6120125-0.3
2016HOU3130168.2118018784134424.484.431.367.22.21071061.3
2015MIL/HOU3130180.1710016274180643.694.031.259.03.2931022.0
2014MIL141071.2650461776172.132.990.889.52.157801.4
2013MIL11322.114028181567.257.171.526.02.4188185-0.7
2012MIL2322127.2910012553135363.743.091.269.52.593773.0
2011MIL202.000020230.005.532.509.013.50140-0.0

Batting Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below.

Trend
2017HOU21000001.000.000.000.000—0.0%100.0%.000-0.3-128-0.0
2015MIL18343000012.100.100.100.000.1670.0%35.3%.088-6.2-59-0.2
2014MIL11261000011.053.053.053.000.1250.0%42.3%.047-5.3-88-0.2
2013MIL45000004.000.000.000.000—0.0%80.0%.000-1.2-118-0.1
2012MIL20383020017.094.094.094.000.2000.0%44.7%.083-7.0-59-0.2

Separate from the regular season

Postseason Postseason

Wild Card through World Series. These games are counted on their own: none of them are in the regular-season tables, career totals, league context, leaderboards or dbWAR on this page.

Postseason pitching

Postseason Mike Fiers's postseason pitching, by October and round. Not part of any regular-season figure on this page.
SeasonTeamRoundGGSIPWLSVHERHRBBSOERAWHIPK/9
2020 PostOAKWild Card111.2000511125.403.6010.8
2015 PostHOUALDS101.0000110009.001.000.0
CareerPostseason total · 2 Octobers212.2000621126.752.636.8

Box-score and rate statistics only. wOBA, wRC+, FIP and dbWAR are measured against a full league season, and a postseason is a few teams playing each other for a month, so they are not computed for October.

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 LHB13115123.455.538.727.53423.1%
vs RHB323010322.333.375.700.4476.3%

Pitch sequencing

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

ShowBatter
SinkerSliderFour-seamChangeupCurveball

Select a count to see exactly what Mike Fiers throws in it.

Pitch arsenal

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

Sinker32.9%5086.92,23034.0%0.0%14——
Slider25.0%3883.42,37647.4%18.2%9——
Four-Seam Fastball23.0%3587.02,28937.1%14.3%9——
Changeup11.2%1781.41,87452.9%18.2%6——
Curveball7.9%1271.62,72033.3%0.0%3——
Mike Fiers'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.

Compare Mike Fiers with…

Side by side with up to three others.

Compare with… add up to 3 more players
Mike Fiers
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.