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Isaac Mattson

#72 - Relief Pitcher

Pittsburgh Pirates

Bats / Throws Right / Right
Date of Birth 7/14/1995 (30)
Height, Weight 6'2", 214 lb
Hometown Erie, PA

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 19.2 4.12 1.47 17.2% 11.5%
138th 1
Sv
161st 19.0
IP
194th 4.56
ERA
218th 1.44
WHIP
275th 22.2%
K%
229th 10.7%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
93.8 9.5% 24.6% 46.2% 5.6% 4.79 4.39
211th 94.3
FB MPH
270th 11.9%
SwStr%
312th 28.5%
CSW%
299th 50.5%
Str-ICR
249th 4.5%
MTK%
279th 4.93
PLV
282nd 3.57
PLA

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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 21 0 19.2 0-0 0 7 4.12 1.47 4.84 3.24 5.45 4.39 17.2% 11.5% 8.7 0.00 .311 0.0% 70.0% 50.8% 26.7% 9.5% 24.6% 0.42 4.79
RP MLB Percentile 70 0 52 0-59 0 90 45 37 29 72 16 21 22 36 39 83 36 83 41 2 6 24 12 29 20
RP MLB AVG 15 1 19.0 1-1 1 2 4.56 1.44 4.36 4.39 4.35 3.57 22.2% 10.7% 8.6 1.08 .293 17.3% 72.0% 37.1% 44.5% 11.9% 28.5% 0.49 4.93
Career 72 0 77.0 3-3 0 19 3.27 1.29 3.87 3.68 4.88 3.94 20.6% 11.8% 7.0 0.47 .263 6.7% 76.0% 39.7% 31.7% 11.1% 26.6% 0.50 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 21 0 19.2 0-0 0 0 7 357 227 130 87 19 13 6 0 0 15 10 1 0
RP MLB Percentile 70 0 52 0-59 0 0 90 65 66 34 58 32 29 10 23 83 42 24 24 47
RP MLB AVG 15 1 19.0 1-1 0 1 2 324 205 119 83 17 12 3 0 2 18 8 1 1
Career 72 0 77.0 3-3 0 0 19 1,325 861 464 330 60 42 14 0 4 68 39 4 1

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 17.2% 11.5% .253 .333 .678 .312 .311 .311 .269 .356 .311 .381 90.6 92.2 20.6 4.84
RP MLB Percentile 22 36 42 64 58 53 36 53 22 29 26 37 19 26 11 29
RP MLB AVG 22.2% 10.7% .241 .386 .717 .321 .293 .321 .236 .323 .284 .364 88.0 89.3 13.0 4.36
Career 20.6% 11.8% .214 .306 .620 .285 .263 .276 .226 .313 .269 .334 88.6 91.6 22.0 3.87

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 BAL 65.9% (92.8) - - 13.2% (84.6) - 13.2% (80.9) 7.7% (86.2) - - 65.9% 34.1%
2024 PIT 70.0% (94.0) - - 7.0% (86.2) - - 23.0% (85.1) - - 70.0% 30.0%
2025 PIT 78.5% (93.9) - - 8.8% (85.1) - 1.0% (78.8) 11.7% (86.0) - - 78.5% 21.5%
2026 PIT 80.4% (93.8) - - 4.2% (86.0) - 5.9% (83.3) 9.2% (85.8) - - 80.4% 19.3%
RP MLB Percentile 99 (39) - - 4 (43) - 15 (75) 25 (40) - - 99.2% 0.6%
RP MLB AVG 36.5% (94.3) 26.4% (93.8) 21.1% (89.2) 26.5% (85.5) 22.9% (82.4) 17.5% (80.2) 18.4% (86.1) 20.4% (86.4) 31.8% (68.1) 48.0% 51.9%
Career 77.5% (93.8) - - 7.7% (85.3) - 3.1% (81.7) 11.6% (85.8) - - 77.5% 22.4%

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 BAL 21.7% (5) - - 33.3% (3) - 33.3% (2) 14.3% (0) - - 21.7% 29.0%
2024 PIT 28.6% (5) - - 0.0% (0) - - 30.4% (6) - - 28.6% 23.3%
2025 PIT 28.7% (71) - - 29.4% (11) - 50.0% (0) 18.7% (10) - - 28.7% 24.6%
2026 PIT 24.7% (26) - - 26.7% (4) - 33.3% (3) 18.2% (1) - - 24.7% 24.6%
RP MLB Percentile 37 (9) - - 33 (59) - 68 (49) 29 (76) - - 23.0% 23.6%
RP MLB AVG 26.5% (11) 27.6% (5) 26.7% (6) 29.7% (10) 27.8% (9) 26.9% (6) 22.1% (8) 25.2% (11) 23.3% (6) 27.9% 28.6%
Career 27.2% (107) - - 27.5% (18) - 36.6% (5) 20.1% (17) - - 27.2% 24.9%

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 26.7% 30.0% 31.7% 11.7% 50.0% 26.7% 31.7% 41.7% 21.8% 48.3% 31.7% 11.7% 8.3% 50.8%
RP MLB Percentile 6 10 85 65 2 4 40 99 92 2 13 7 31 2
RP MLB AVG 44.5% 21.3% 24.0% 10.2% 34.1% 41.4% 33.8% 24.8% 17.6% 62.6% 24.3% 6.0% 7.1% 37.1%
Career 31.7% 21.1% 27.5% 19.7% 38.5% 24.8% 38.5% 36.7% 21.8% 60.1% 23.9% 9.2% 6.9% 39.7%

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 .253 .312 .311 .311 .269 .356 .311 .381 90.6 92.2 20.6 0.0% 50.8% 35.6%
RP MLB Percentile 42 53 36 53 22 29 26 37 19 26 11 83 2 3
RP MLB AVG .241 .321 .293 .321 .236 .323 .284 .364 88.0 89.3 13.0 17.3% 37.1% 24.4%
Career .214 .285 .263 .276 .226 .313 .269 .334 88.6 91.6 22.0 6.7% 39.7% 26.4%

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 44.0% 63.6% 48.5% 31.5% 19.7% 21.8% 80.3% 86.2% 69.8% 15.1% 9.5% 24.6% 17.1% 58.3% 0.42 46.2%
RP MLB Percentile 47 54 68 53 18 92 18 37 13 27 24 12 51 54 29 15
RP MLB AVG 44.2% 63.0% 46.4% 30.8% 25.6% 17.6% 74.4% 83.8% 58.6% 16.6% 11.9% 28.5% 16.9% 57.6% 0.49 50.5%
Career 48.0% 65.0% 49.4% 29.8% 22.4% 21.8% 77.6% 82.0% 67.8% 15.5% 11.1% 26.6% 16.5% 60.5% 0.50 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 44.0% 43.3% 31.5% 25.3% 52.2% 21.3% 26.4% 29.5% 39.0% 7.6%
RP MLB Percentile 47 86 12 4 98 64 2 46 26 78
RP MLB AVG 44.2% 34.8% 26.8% 38.4% 36.3% 22.8% 40.9% 30.5% 42.7% 6.4%
Career 48.0% 40.7% 30.4% 28.9% 50.2% 21.9% 27.9% 27.5% 42.1% 7.0%

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 55.2% 12.0% 32.8% 13.2% 58.6% 47.1% 21.3% 26.5% 12.8%
RP MLB Percentile 12 57 81 35 38 33 54 50 10
RP MLB AVG 58.5% 12.8% 29.4% 14.1% 60.1% 49.6% 21.2% 26.3% 19.4%
Career 56.3% 12.2% 32.2% 13.3% 62.2% 49.7% 22.5% 24.9% 16.0%

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 357 4.79 44.3% 14.3% 41.5% 2.8% 5.6% -1.1 +2 4.39
RP MLB Percentile 65 20 31 17 14 14 28 63 30 21
RP MLB AVG 324 4.93 46.2% 16.8% 37.0% 9.2% 4.5% 0.3 0 3.57
Career 1,325 4.86 45.1% 15.8% 39.0% 6.1% 6.0% -10.3 -3 3.94
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