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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%
221st 3
Sv
227th 52.0
IP
278th 4.19
ERA
294th 1.34
WHIP
222nd 22.7%
K%
206th 9.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.2 10.3% 25.4% 48.9% 6.0% 4.84 4.36
210th 94.7
FB MPH
250th 12.2%
SwStr%
304th 28.6%
CSW%
266th 51.2%
Str-ICR
286th 4.7%
MTK%
264th 4.94
PLV
303rd 3.56
PLA
Holds List
Rank
38th
Saves+Holds List
Rank
64th

Articles

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See More Articles
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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 4.96 26.1% 21.7% 1.7 0.00 .091 0.0% 57.1% 45.5% 54.5% 11.0% 27.0% 0.56 4.69
2025 PIT 44 0 47.2 3-3 0 12 2.45 1.13 3.37 3.67 4.27 3.13 22.3% 9.6% 6.6 0.76 .246 12.1% 83.3% 34.1% 31.8% 11.8% 27.8% 0.55 4.91
2026 PIT 38 0 38.2 0-0 0 8 5.35 1.60 5.32 3.73 4.96 4.36 20.5% 10.2% 10.2 0.70 .347 8.3% 68.0% 47.9% 30.8% 10.3% 25.4% 0.47 4.84
RP MLB Percentile 46 0 34 0-85 0 61 20 15 12 67 16 13 35 41 12 71 12 89 28 1 5 29 12 42 23
RP MLB AVG 42 2 52.0 3-3 3 7 4.19 1.34 4.16 4.17 4.24 3.56 22.7% 9.8% 8.3 1.08 .291 17.6% 72.5% 36.8% 44.0% 12.2% 28.6% 0.50 4.94
Career 89 0 96.0 3-3 0 20 3.94 1.38 4.26 3.79 4.80 3.90 21.2% 11.2% 8.0 0.66 .289 9.1% 73.7% 40.9% 32.4% 11.1% 26.5% 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 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 46 0 34 0-85 0 0 61 44 45 57 36 45 54 11 50 70 33 53 64 51
RP MLB AVG 42 2 52.0 3-3 0 3 7 884 565 319 227 48 32 9 1 6 52 21 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

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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 .349 .347 .364 .275 .362 .319 .417 90.7 93.7 16.6 5.32
RP MLB Percentile 35 41 15 25 23 20 12 17 10 12 9 9 5 3 26 12
RP MLB AVG 22.7% 9.8% .241 .388 .712 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 4.16
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 (40) - - 16 (19) 14 (59) - 29 (44) - - 95.7% 4.0%
RP MLB AVG 38.7% (94.7) 26.6% (94.1) 19.6% (89.4) 25.9% (86.1) 20.7% (82.3) 15.3% (80.3) 17.6% (86.1) 18.9% (86.6) 42.7% (61.5) 48.7% 51.2%
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 45 (21) - - 35 (58) 26 (60) - 20 (70) - - 34.6% 8.9%
RP MLB AVG 27.2% (32) 27.6% (13) 26.9% (15) 29.7% (28) 28.4% (20) 27.3% (15) 22.4% (21) 22.6% (21) 19.3% (9) 27.9% 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 5 3 88 47 0 12 24 97 98 1 20 5 5 1
RP MLB AVG 44.0% 21.7% 24.1% 10.2% 34.6% 40.9% 33.7% 25.4% 18.1% 63.0% 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 .349 .347 .364 .275 .362 .319 .417 90.7 93.7 16.6 8.3% 47.9% 33.0%
RP MLB Percentile 15 20 12 17 10 12 9 9 5 3 26 89 1 2
RP MLB AVG .241 .314 .291 .321 .235 .314 .280 .358 87.6 89.3 13.1 17.6% 36.8% 24.4%
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 68 62 75 55 17 98 17 38 14 27 29 12 41 56 42 23
RP MLB AVG 44.5% 63.8% 47.4% 31.7% 25.6% 18.1% 74.4% 83.9% 58.5% 16.4% 12.2% 28.6% 17.1% 58.3% 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 68 89 8 2 97 49 2 39 23 94
RP MLB AVG 44.5% 34.6% 27.0% 38.4% 36.2% 22.9% 40.9% 29.9% 43.1% 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 56 95 42 32 16 44 33 10
RP MLB AVG 58.5% 12.1% 29.9% 14.5% 61.1% 50.2% 21.1% 26.7% 19.3%
Career 55.5% 11.9% 33.0% 13.7% 61.6% 48.7% 22.0% 24.6% 15.9%

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 4.69 43.0% 19.0% 38.0% 5.0% 8.0% -2.8 -4 4.96
2025 PIT 777 4.91 44.6% 17.3% 38.2% 6.4% 6.4% -5.1 -2 3.13
2026 PIT 728 4.84 43.5% 16.9% 39.6% 4.0% 6.0% 5.7 +6 4.36
RP MLB Percentile 44 23 22 42 20 20 17 25 17 13
RP MLB AVG 884 4.94 45.9% 17.3% 36.8% 9.1% 4.7% 0.6 0 3.56
Career 1,696 4.84 44.0% 16.9% 39.2% 4.8% 6.2% -1.9 +3 3.90
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