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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%
156th 1
Sv
210th 23.0
IP
188th 4.43
ERA
233rd 1.39
WHIP
268th 22.2%
K%
239th 10.4%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
93.8 9.5% 24.6% 46.2% 5.3% 4.76 4.51
218th 94.3
FB MPH
274th 12.0%
SwStr%
309th 28.5%
CSW%
304th 50.5%
Str-ICR
228th 4.5%
MTK%
298th 4.93
PLV
297th 3.60
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 4.90 3.27 5.56 4.51 17.2% 11.5% 8.7 0.00 .311 0.0% 70.0% 50.8% 26.7% 9.5% 24.6% 0.42 4.76
RP MLB Percentile 57 0 39 0-65 0 83 46 33 26 75 14 15 23 32 40 90 36 90 41 3 6 21 11 29 14
RP MLB AVG 18 1 23.0 1-1 1 3 4.43 1.39 4.30 4.30 4.34 3.60 22.2% 10.4% 8.5 1.08 .292 17.6% 72.0% 37.4% 43.7% 12.0% 28.5% 0.49 4.93
Career 72 0 77.0 3-3 0 19 3.27 1.29 3.89 3.69 4.91 3.97 20.6% 11.8% 7.0 0.47 .263 6.7% 76.0% 39.7% 31.7% 11.1% 26.6% 0.50 4.85

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 57 0 39 0-65 0 0 83 45 45 55 42 45 44 16 27 90 30 37 32 53
RP MLB AVG 18 1 23.0 1-1 0 1 3 397 252 146 102 21 14 4 0 3 23 10 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 .311 .311 .311 .269 .354 .311 .379 90.6 92.2 20.6 4.90
RP MLB Percentile 23 32 40 66 57 50 36 54 19 26 26 35 13 24 11 26
RP MLB AVG 22.2% 10.4% .242 .390 .720 .320 .292 .322 .237 .322 .283 .364 87.9 89.5 13.3 4.30
Career 20.6% 11.8% .214 .306 .620 .284 .263 .276 .226 .311 .269 .332 88.6 91.6 22.0 3.89

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) - - 9.5% (84.6) - 0.6% (82.4) 9.2% (85.8) - - 80.4% 19.3%
RP MLB Percentile 99 (36) - - 12 (27) - 0 (67) 26 (39) - - 99.4% 0.3%
RP MLB AVG 37.6% (94.3) 25.8% (93.9) 21.7% (89.3) 26.0% (85.4) 22.0% (82.5) 17.5% (79.8) 18.4% (86.2) 19.8% (86.5) 31.8% (68.1) 47.7% 52.2%
Career 77.5% (93.8) - - 9.1% (85.0) - 1.7% (80.2) 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) - - 32.4% (7) - 0.0% (0) 18.2% (1) - - 24.7% 24.6%
RP MLB Percentile 33 (15) - - 63 (50) - 0 (0) 29 (77) - - 20.2% 21.9%
RP MLB AVG 27.0% (14) 27.4% (6) 27.0% (7) 29.3% (12) 28.2% (11) 26.9% (7) 21.8% (10) 24.5% (13) 23.3% (6) 27.9% 28.6%
Career 27.2% (107) - - 28.9% (21) - 36.4% (2) 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 9 87 64 2 3 38 100 94 2 11 5 32 3
RP MLB AVG 43.7% 21.7% 24.2% 10.4% 34.6% 41.3% 33.6% 25.2% 17.7% 62.3% 24.6% 5.9% 7.2% 37.4%
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 .311 .311 .311 .269 .354 .311 .379 90.6 92.2 20.6 0.0% 50.8% 35.6%
RP MLB Percentile 40 50 36 54 19 26 26 35 13 24 11 90 3 2
RP MLB AVG .242 .320 .292 .322 .237 .322 .283 .364 87.9 89.5 13.3 17.6% 37.4% 24.7%
Career .214 .284 .263 .276 .226 .311 .269 .332 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 46 51 65 52 16 94 16 37 12 27 21 11 50 56 29 13
RP MLB AVG 44.3% 63.2% 46.6% 31.0% 25.6% 17.7% 74.4% 84.0% 58.4% 16.5% 12.0% 28.5% 17.0% 57.7% 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 46 90 11 2 98 64 2 44 23 78
RP MLB AVG 44.3% 34.7% 26.8% 38.5% 36.3% 22.8% 40.9% 30.1% 43.0% 6.5%
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 10 55 83 34 35 31 54 51 7
RP MLB AVG 58.5% 12.6% 29.5% 14.2% 60.2% 49.6% 21.2% 26.3% 19.2%
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 4.76 42.6% 16.8% 40.6% 2.0% 5.3% -1.4 +2 4.51
RP MLB Percentile 45 14 17 48 16 16 33 64 34 15
RP MLB AVG 397 4.93 46.0% 17.0% 37.0% 9.0% 4.5% 0.5 +0 3.60
Career 1,325 4.85 44.7% 16.5% 38.8% 5.9% 6.0% -10.6 -3 3.97
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