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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 38.2 5.35 1.60 20.5% 10.2%
217th 3
Sv
212th 48.0
IP
277th 4.22
ERA
293rd 1.35
WHIP
221st 22.5%
K%
207th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.2 10.3% 25.4% 48.9% 6.2% 4.83 4.40
213th 94.6
FB MPH
252nd 12.1%
SwStr%
300th 28.5%
CSW%
257th 51.2%
Str-ICR
293rd 4.7%
MTK%
266th 4.94
PLV
301st 3.51
PLA

Articles

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

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

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Isaac Mattson Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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 38 0 38.2 0-0 0 8 5.35 1.60 5.32 3.72 4.95 4.40 20.5% 10.2% 10.2 0.70 .347 8.3% 68.0% 47.9% 30.8% 10.3% 25.4% 0.47 4.83
RP MLB Percentile 50 0 38 0-84 0 64 21 15 14 67 20 13 36 40 14 71 12 89 30 2 6 28 13 41 21
RP MLB AVG 38 2 48.0 3-3 3 6 4.22 1.35 4.21 4.21 4.28 3.51 22.5% 9.8% 8.3 1.10 .290 17.5% 72.6% 36.8% 43.7% 12.1% 28.5% 0.50 4.94
Career 89 0 96.0 3-3 0 20 3.94 1.38 4.26 3.79 4.80 4.03 21.2% 11.2% 8.0 0.66 .289 9.1% 73.7% 40.9% 32.4% 11.1% 26.5% 0.51 4.86

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 38 0 38.2 0-0 0 0 8 728 472 256 176 44 26 15 0 3 36 18 1 1
RP MLB Percentile 50 0 38 0-84 0 0 64 47 48 52 42 37 46 9 47 66 37 47 63 47
RP MLB AVG 38 2 48.0 3-3 0 3 6 807 516 291 207 44 29 8 1 6 47 20 3 2
Career 89 0 96.0 3-3 0 0 20 1,696 1,106 590 419 85 55 23 0 7 89 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% 10.2% .282 .436 .794 .350 .347 .364 .275 .362 .319 .417 90.7 93.7 16.6 5.32
RP MLB Percentile 36 40 16 27 25 21 12 19 12 14 11 12 5 3 27 14
RP MLB AVG 22.5% 9.8% .240 .389 .713 .314 .290 .320 .235 .315 .279 .358 87.7 89.2 13.3 4.21
Career 21.2% 11.2% .235 .356 .682 .305 .289 .307 .238 .323 .281 .357 89.1 92.4 20.0 4.26

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 PIT70.3% (94.2)--12.1% (84.4)7.3% (83.0)-10.2% (86.0)-- 70.3% 29.5%
RP MLB Percentile 98 (38) - - 16 (22) 14 (58) - 33 (41) - - 95.4% 4.0%
RP MLB AVG 38.6% (94.6) 26.5% (94.0) 20.1% (89.4) 25.8% (85.9) 21.2% (82.4) 15.5% (80.3) 16.7% (86.2) 18.1% (86.6) 43.2% (61.5) 48.5% 51.3%
Career73.8% (93.9)--10.3% (84.8)3.1% (83.0)1.2% (80.0)11.5% (85.9)-- 73.8% 26.1%

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 PIT26.6% (50)--27.3% (13)24.5% (8)-16.2% (4)-- 26.6% 22.8%
RP MLB Percentile 46 (17) - - 35 (53) 25 (59) - 25 (62) - - 38.6% 8.3%
RP MLB AVG 27.1% (29) 27.4% (12) 26.7% (13) 29.8% (25) 28.3% (18) 26.9% (13) 21.6% (17) 22.1% (18) 20.0% (9) 27.8% 28.8%
Career27.5% (131)--27.4% (27)24.5% (8)40.0% (2)19.0% (20)-- 27.5% 23.9%

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 30.8% 30.0% 30.0% 9.2% 47.5% 34.2% 30.8% 35.0% 22.8% 51.7% 27.5% 10.0% 10.8% 47.9%
RP MLB Percentile 6 5 85 46 2 12 23 97 98 1 22 6 7 2
RP MLB AVG 43.7% 21.6% 24.4% 10.3% 34.7% 40.8% 33.7% 25.5% 18.2% 62.9% 24.5% 5.8% 6.8% 36.8%
Career 32.4% 23.0% 27.7% 16.9% 39.9% 28.4% 36.7% 34.9% 22.2% 59.1% 23.7% 9.0% 8.3% 40.9%

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 .282 .350 .347 .364 .275 .362 .319 .417 90.7 93.7 16.6 8.3% 47.9% 33.0%
RP MLB Percentile 16 21 12 19 12 14 11 12 5 3 27 89 2 3
RP MLB AVG .240 .314 .290 .320 .235 .315 .279 .358 87.7 89.2 13.3 17.5% 36.8% 24.5%
Career .235 .305 .289 .307 .238 .323 .281 .357 89.1 92.4 20.0 9.1% 40.9% 27.2%

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 45.9% 64.8% 49.7% 32.0% 20.7% 22.8% 79.3% 85.5% 67.5% 15.1% 10.3% 25.4% 16.6% 58.8% 0.47 48.9%
RP MLB Percentile 71 64 73 54 18 98 18 40 13 27 28 13 42 57 41 26
RP MLB AVG 44.4% 63.8% 47.4% 31.8% 25.5% 18.2% 74.5% 84.0% 58.7% 16.4% 12.1% 28.5% 17.1% 58.4% 0.50 51.2%
Career 47.9% 65.2% 49.8% 30.4% 22.3% 22.2% 77.7% 82.6% 67.2% 15.4% 11.1% 26.5% 16.5% 60.2% 0.51 51.8%

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 45.9% 42.1% 31.6% 26.3% 50.5% 22.8% 26.7% 28.5% 39.9% 8.5%
RP MLB Percentile 71 88 7 2 97 48 3 39 23 95
RP MLB AVG 44.4% 34.5% 27.0% 38.5% 36.4% 22.8% 40.8% 29.8% 43.2% 6.6%
Career 47.9% 40.8% 30.7% 28.6% 49.9% 22.4% 27.7% 27.5% 41.8% 7.6%

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 54.0% 11.5% 34.5% 14.2% 59.1% 46.0% 20.6% 25.1% 14.3%
RP MLB Percentile 1 57 94 43 32 17 45 33 11
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.0% 50.1% 21.1% 26.8% 19.2%
Career 55.5% 11.9% 33.0% 13.7% 61.6% 48.7% 22.0% 24.6% 15.9%

Isaac Mattson PLV

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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 728 4.83 42.9% 17.2% 40.0% 2.9% 6.2% 5.5 +6 4.40
RP MLB Percentile 47 21 19 47 15 15 15 28 16 13
RP MLB AVG 807 4.94 46.0% 17.3% 36.7% 9.2% 4.7% 0.6 -1 3.51
Career 1,696 4.86 44.3% 16.7% 38.9% 5.4% 6.2% -3.7 +2 4.03
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