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Isaac Mattson

#72 - Relief Pitcher

Pittsburgh Pirates

Bats / Throws Right / Right
Date of Birth 7/14/1995 (31)
Height, Weight 6'2", 214 lb
Hometown Erie, PA

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 36.2 4.91 1.58 20.5% 10.8%
210th 3
Sv
195th 42.0
IP
244th 4.24
ERA
290th 1.35
WHIP
220th 22.5%
K%
231st 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.1 10.7% 25.7% 49.1% 6.2% 4.79 4.55
216th 94.6
FB MPH
233rd 12.2%
SwStr%
287th 28.5%
CSW%
242nd 51.1%
Str-ICR
290th 4.7%
MTK%
288th 4.94
PLV
309th 3.53
PLA

Articles

7/29/2026Fantasy Baseball Relief Pitcher Roundup: 7/28Rick Graham

7/26/2026Fantasy Baseball Relief Pitcher Roundup: 7/25Rick Graham

7/20/2026Fantasy Baseball Relief Pitcher Roundup: 7/19Rick Graham

7/19/2026Fantasy Baseball Relief Pitcher Roundup: 7/18Rick Graham

7/14/2026Pirates 2026 All-Star Break Report CardsJoe Landolina

See More Articles
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Isaac Mattson Overview

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Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR% GB% SwStr% CSW% IPR% PLV
2021 BAL 4 0 4.1 0-0 0 0 6.23 2.31 3.62 5.37 9.30 6.88 13.0% 21.7% 10.4 0.00 .333 0.0% 70.0% 40.0% 33.3% 11.0% 24.2% 0.32 4.45
2024 PIT 3 0 5.1 0-0 0 0 5.06 1.13 5.01 4.34 5.28 4.87 26.1% 21.7% 1.7 0.00 .091 0.0% 57.1% 45.5% 54.5% 11.0% 27.0% 0.56 4.67
2025 PIT 44 0 47.2 3-3 0 12 2.45 1.13 3.37 3.67 4.27 3.39 22.3% 9.6% 6.6 0.76 .246 12.1% 83.3% 34.1% 31.8% 11.8% 27.8% 0.55 4.96
2026 PIT 37 0 36.2 0-0 0 8 4.91 1.58 5.20 3.86 5.04 4.55 20.5% 10.8% 9.8 0.74 .336 8.8% 71.2% 46.9% 30.4% 10.7% 25.7% 0.48 4.79
RP MLB Percentile 55 0 44 0-81 0 69 29 17 17 59 19 12 36 33 21 68 19 86 41 4 6 32 18 42 16
RP MLB AVG 33 2 42.0 2-2 3 6 4.24 1.35 4.23 4.26 4.31 3.53 22.5% 9.8% 8.3 1.13 .289 17.8% 72.7% 36.9% 43.7% 12.2% 28.5% 0.50 4.94
Career 88 0 94.0 3-3 0 20 3.73 1.36 4.19 3.84 4.82 4.09 21.3% 11.5% 7.8 0.67 .282 9.3% 75.3% 40.2% 32.2% 11.3% 26.7% 0.51 4.84

Isaac Mattson Repertoire

2021 2024 2025 2026 All
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Isaac Mattson Game Log

Isaac Mattson Standard

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Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2021 BAL 4 0 4.1 0-0 0 0 0 91 53 38 23 5 4 1 0 0 3 5 0 1
2024 PIT 3 0 5.1 0-0 0 0 0 100 62 38 23 1 1 0 0 0 6 5 1 0
2025 PIT 44 0 47.2 3-3 0 0 12 777 519 258 197 35 24 7 0 4 44 19 2 0
2026 PIT 37 0 36.2 0-0 0 0 8 689 444 245 166 40 24 13 0 3 34 18 1 1
RP MLB Percentile 55 0 44 0-81 0 0 69 53 52 47 46 35 41 8 44 60 43 37 58 42
RP MLB AVG 33 2 42.0 2-2 0 3 6 710 453 256 182 38 25 7 1 5 41 17 2 2
Career 88 0 94.0 3-3 0 0 20 1,657 1,078 579 409 81 53 21 0 7 87 47 4 2

Isaac Mattson Advanced

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Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2021 BAL 13.0% 21.7% .278 .333 .768 .357 .333 .333 .145 .291 .148 .215 90.1 90.4 25.4 3.62
2024 PIT 26.1% 21.7% .059 .059 .363 .219 .091 .091 .201 .347 .287 .347 83.3 97.8 6.7 5.01
2025 PIT 22.3% 9.6% .205 .316 .603 .266 .246 .269 .218 .285 .262 .316 87.9 91.1 23.6 3.37
2026 PIT 20.5% 10.8% .274 .425 .780 .344 .336 .354 .269 .359 .312 .410 90.5 94.0 17.2 5.20
RP MLB Percentile 36 33 24 32 28 25 19 25 17 17 16 14 8 4 23 17
RP MLB AVG 22.5% 9.8% .240 .391 .714 .315 .289 .320 .236 .316 .280 .360 87.7 89.2 13.3 4.23
Career 21.3% 11.5% .230 .349 .673 .302 .282 .301 .235 .320 .277 .352 88.9 92.5 20.3 4.19

Isaac Mattson Pitch › Mix

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Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2021 BAL65.9% (92.8)--13.2% (84.6)-13.2% (80.9)7.7% (86.2)-- 65.9% 34.1%
2024 PIT70.0% (94.0)--7.0% (86.2)--23.0% (85.1)-- 70.0% 30.0%
2025 PIT78.5% (93.9)--8.8% (85.1)-1.0% (78.8)11.7% (86.0)-- 78.5% 21.5%
2026 PIT71.4% (94.1)--11.5% (84.2)7.3% (82.9)-9.7% (86.0)-- 71.4% 28.4%
RP MLB Percentile 98 (37) - - 16 (21) 14 (56) - 30 (40) - - 97.2% 2.6%
RP MLB AVG 38.1% (94.6) 26.4% (93.9) 20.3% (89.4) 25.6% (85.7) 21.4% (82.5) 16.5% (79.6) 17.1% (86.2) 17.4% (86.6) 32.8% (68.2) 48.1% 51.8%
Career74.4% (93.9)--10.0% (84.7)3.0% (82.9)1.2% (80.0)11.4% (85.9)-- 74.4% 25.6%

Isaac Mattson Pitch › Results

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Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2021 BAL21.7% (5)--33.3% (3)-33.3% (2)14.3% (0)-- 21.7% 29.0%
2024 PIT28.6% (5)--0.0% (0)--30.4% (6)-- 28.6% 23.3%
2025 PIT28.7% (71)--29.4% (11)-50.0% (0)18.7% (10)-- 28.7% 24.6%
2026 PIT26.8% (50)--25.3% (12)26.0% (8)-17.9% (4)-- 26.8% 23.0%
RP MLB Percentile 49 (14) - - 27 (50) 37 (55) - 31 (59) - - 38.8% 11.4%
RP MLB AVG 27.0% (25) 27.5% (10) 26.6% (12) 29.3% (22) 28.2% (16) 27.0% (11) 21.5% (16) 23.4% (17) 22.0% (9) 27.8% 28.8%
Career27.6% (131)--26.5% (26)26.0% (8)40.0% (2)19.7% (20)-- 27.6% 24.1%

Isaac Mattson Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR%
2021 BAL 33.3% 6.7% 40.0% 20.0% 26.7% 26.7% 26.7% 46.7% 17.6% 60.0% 13.3% 13.3% 13.3% 40.0%
2024 PIT 54.5% 18.2% 18.2% 9.1% 36.4% 9.1% 45.5% 45.5% 24.0% 54.6% 27.3% 9.1% 9.1% 45.5%
2025 PIT 31.8% 18.9% 25.0% 24.2% 34.8% 25.0% 42.4% 32.6% 22.0% 66.0% 21.2% 7.6% 5.3% 34.1%
2026 PIT 30.4% 29.5% 30.4% 9.8% 47.3% 31.3% 32.1% 36.6% 22.4% 52.8% 26.8% 9.8% 10.7% 46.9%
RP MLB Percentile 6 5 87 53 3 5 38 98 96 5 26 8 9 4
RP MLB AVG 43.7% 21.6% 24.5% 10.2% 34.7% 41.0% 33.8% 25.2% 18.2% 62.8% 24.4% 5.8% 7.0% 36.9%
Career 32.2% 22.6% 27.8% 17.4% 39.6% 27.0% 37.4% 35.6% 22.0% 59.6% 23.3% 8.9% 8.1% 40.2%

Isaac Mattson Batted Ball › Outcomes

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Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR% IPA%
2021 BAL .278 .357 .333 .333 .145 .291 .148 .215 90.1 90.4 25.4 0.0% 40.0% 26.1%
2024 PIT .059 .219 .091 .091 .201 .347 .287 .347 83.3 97.8 6.7 0.0% 45.5% 21.7%
2025 PIT .205 .266 .246 .269 .218 .285 .262 .316 87.9 91.1 23.6 12.1% 34.1% 22.8%
2026 PIT .274 .344 .336 .354 .269 .359 .312 .410 90.5 94.0 17.2 8.8% 46.9% 31.9%
RP MLB Percentile 24 25 19 25 17 17 16 14 8 4 23 86 4 7
RP MLB AVG .240 .315 .289 .320 .236 .316 .280 .360 87.7 89.2 13.3 17.8% 36.9% 24.5%
Career .230 .302 .282 .301 .235 .320 .277 .352 88.9 92.5 20.3 9.3% 40.2% 26.7%

Isaac Mattson Approach › Plate Discipline

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Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR% Str-ICR
2021 BAL 42.9% 58.2% 45.1% 25.0% 24.4% 17.6% 75.6% 82.1% 61.5% 13.2% 11.0% 24.2% 16.5% 52.7% 0.32 45.1%
2024 PIT 45.0% 62.0% 46.0% 27.3% 23.9% 24.0% 76.1% 80.6% 66.7% 16.0% 11.0% 27.0% 11.0% 61.0% 0.56 52.0%
2025 PIT 50.8% 66.8% 50.8% 29.8% 23.3% 22.0% 76.7% 80.4% 67.5% 16.0% 11.8% 27.8% 17.0% 62.3% 0.55 55.2%
2026 PIT 45.7% 64.4% 49.5% 31.8% 21.7% 22.4% 78.3% 84.6% 66.4% 14.9% 10.7% 25.7% 16.4% 58.6% 0.48 49.1%
RP MLB Percentile 68 58 71 54 25 96 25 50 17 26 32 18 38 57 42 30
RP MLB AVG 44.4% 63.8% 47.5% 31.8% 25.7% 18.2% 74.3% 83.8% 58.5% 16.3% 12.2% 28.5% 17.1% 58.4% 0.50 51.1%
Career 47.9% 65.1% 49.7% 30.2% 22.7% 22.0% 77.3% 82.2% 66.7% 15.4% 11.3% 26.7% 16.4% 60.2% 0.51 51.9%

Isaac Mattson Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2021 BAL 42.9% 40.7% 19.8% 39.6% 42.9% 17.6% 39.6% 33.0% 47.3% 1.1%
2024 PIT 45.0% 43.0% 27.0% 30.0% 49.0% 23.0% 28.0% 25.0% 48.0% 10.0%
2025 PIT 50.8% 39.3% 31.5% 29.2% 50.3% 22.5% 27.2% 26.3% 42.2% 7.1%
2026 PIT 45.7% 42.7% 31.5% 25.7% 50.9% 22.5% 26.6% 29.1% 39.4% 8.6%
RP MLB Percentile 68 90 7 1 97 53 1 44 21 95
RP MLB AVG 44.4% 34.5% 27.0% 38.5% 36.4% 22.9% 40.8% 29.8% 43.2% 6.6%
Career 47.9% 41.0% 30.6% 28.4% 50.1% 22.3% 27.7% 27.7% 41.7% 7.5%

Isaac Mattson Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2021 BAL 51.6% 16.5% 31.9% 19.1% 52.2% 34.8% 17.0% 24.1% 10.3%
2024 PIT 56.0% 12.0% 32.0% 7.1% 47.8% 47.8% 25.0% 25.0% 18.8%
2025 PIT 57.4% 11.7% 31.9% 13.5% 66.7% 52.8% 23.3% 24.2% 17.7%
2026 PIT 54.1% 12.2% 33.7% 13.9% 57.2% 45.2% 20.4% 25.9% 14.7%
RP MLB Percentile 1 46 91 42 21 16 43 42 15
RP MLB AVG 58.5% 12.1% 29.9% 14.4% 60.9% 50.1% 21.1% 26.9% 19.1%
Career 55.6% 12.2% 32.6% 13.6% 60.9% 48.4% 21.9% 25.0% 16.1%

Isaac Mattson PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2021 BAL 91 4.45 44.0% 11.0% 45.1% -1.1% 4.4% 0.4 +3 6.88
2024 PIT 100 4.67 44.0% 18.0% 38.0% 6.0% 8.0% -2.8 -4 4.87
2025 PIT 777 4.96 45.8% 16.9% 37.3% 8.5% 6.2% -6.7 -3 3.39
2026 PIT 689 4.79 42.7% 16.4% 40.9% 1.7% 6.2% 3.6 +5 4.55
RP MLB Percentile 53 16 19 33 11 11 17 33 20 12
RP MLB AVG 710 4.94 46.0% 17.4% 36.7% 9.3% 4.7% 0.8 0 3.53
Career 1,657 4.84 44.3% 16.4% 39.3% 5.0% 6.2% -5.5 0 4.09
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