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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 25.2 3.51 1.29 20.2% 11.0%
176th 2
Sv
206th 29.0
IP
144th 4.41
ERA
140th 1.40
WHIP
200th 22.2%
K%
232nd 10.2%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
93.9 10.5% 27.1% 49.2% 6.5% 4.74 4.39
222nd 94.5
FB MPH
252nd 12.1%
SwStr%
218th 28.4%
CSW%
243rd 50.6%
Str-ICR
298th 4.6%
MTK%
307th 4.93
PLV
295th 3.55
PLA

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 27 0 25.2 0-0 0 7 3.51 1.29 4.65 3.42 5.10 4.39 20.2% 11.0% 7.4 0.35 .274 4.3% 73.6% 47.3% 28.8% 10.5% 27.1% 0.51 4.74
RP MLB Percentile 55 0 40 0-72 0 76 59 59 26 75 23 16 42 33 71 88 64 93 50 3 4 28 37 58 12
RP MLB AVG 23 1 29.0 2-2 2 4 4.41 1.40 4.35 4.37 4.42 3.55 22.2% 10.2% 8.5 1.13 .291 18.0% 72.0% 37.2% 43.4% 12.1% 28.4% 0.49 4.93
Career 78 0 83.0 3-3 0 19 3.14 1.24 3.88 3.71 4.81 3.97 21.3% 11.6% 6.7 0.54 .253 7.8% 77.0% 39.2% 32.0% 11.3% 27.3% 0.52 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 27 0 25.2 0-0 0 0 7 447 290 157 109 21 14 6 0 1 22 12 1 1
RP MLB Percentile 55 0 40 0-72 0 0 76 44 44 56 39 61 58 27 34 77 38 40 39 33
RP MLB AVG 23 1 29.0 2-2 0 2 4 494 314 180 127 27 18 5 0 4 28 12 2 1
Career 78 0 83.0 3-3 0 0 19 1,415 924 491 352 62 43 14 0 5 75 41 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 20.2% 11.0% .221 .316 .628 .287 .274 .284 .248 .341 .284 .379 89.0 93.4 19.8 4.65
RP MLB Percentile 42 33 70 79 74 73 64 76 31 26 38 27 20 14 8 26
RP MLB AVG 22.2% 10.2% .243 .393 .721 .319 .291 .321 .237 .320 .280 .361 87.8 89.3 13.4 4.35
Career 21.3% 11.6% .206 .302 .608 .277 .253 .270 .222 .309 .262 .333 88.2 92.0 21.7 3.88

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 74.7% (93.9) - - 11.0% (84.0) 3.8% (83.0) 0.2% (83.1) 10.1% (86.1) - - 74.7% 25.1%
RP MLB Percentile 99 (36) - - 17 (22) 2 (55) 0 (76) 30 (42) - - 98.3% 1.4%
RP MLB AVG 37.5% (94.5) 25.1% (94.0) 21.0% (89.4) 26.0% (85.1) 21.1% (82.6) 17.4% (79.6) 17.8% (86.2) 19.1% (86.4) 31.8% (68.1) 48.0% 51.8%
Career 75.9% (93.8) - - 9.6% (84.7) 1.2% (84.7) 1.5% (80.2) 11.7% (85.9) - - 75.9% 24.0%

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 28.7% (33) - - 30.6% (11) 11.8% (0) 0.0% (0) 17.8% (3) - - 28.7% 22.3%
RP MLB Percentile 61 (14) - - 56 (43) 2 (95) 0 (0) 29 (61) - - 60.8% 11.1%
RP MLB AVG 26.9% (17) 27.3% (7) 27.4% (9) 29.6% (15) 28.3% (12) 27.7% (8) 21.6% (12) 24.1% (14) 23.3% (6) 27.6% 28.7%
Career 28.3% (114) - - 28.7% (25) 11.8% (0) 38.1% (2) 19.9% (19) - - 28.3% 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 28.8% 26.0% 31.5% 13.7% 46.6% 30.1% 32.9% 37.0% 21.3% 52.1% 27.4% 11.0% 9.6% 47.3%
RP MLB Percentile 4 15 91 81 3 3 46 98 90 2 21 5 19 3
RP MLB AVG 43.4% 21.6% 24.5% 10.5% 34.5% 41.1% 33.7% 25.2% 17.9% 62.5% 24.5% 5.9% 7.2% 37.2%
Career 32.0% 20.3% 27.7% 19.9% 38.1% 26.0% 38.5% 35.5% 21.6% 60.6% 22.9% 9.1% 7.4% 39.2%

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 .221 .287 .274 .284 .248 .341 .284 .379 89.0 93.4 19.8 4.3% 47.3% 32.1%
RP MLB Percentile 70 73 64 76 31 26 38 27 20 14 8 93 3 4
RP MLB AVG .243 .319 .291 .321 .237 .320 .280 .361 87.8 89.3 13.4 18.0% 37.2% 24.7%
Career .206 .277 .253 .270 .222 .309 .262 .333 88.2 92.0 21.7 7.8% 39.2% 25.9%

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 45.6% 64.9% 48.3% 31.3% 21.8% 21.3% 78.2% 84.9% 65.8% 16.6% 10.5% 27.1% 16.6% 60.2% 0.51 49.2%
RP MLB Percentile 62 61 54 46 23 90 23 43 18 61 28 37 33 73 58 29
RP MLB AVG 44.4% 63.4% 47.0% 31.3% 25.6% 17.9% 74.4% 83.9% 58.6% 16.3% 12.1% 28.4% 17.1% 57.9% 0.49 50.6%
Career 48.3% 65.3% 49.3% 29.8% 22.9% 21.6% 77.1% 81.8% 66.5% 16.0% 11.3% 27.3% 16.4% 60.9% 0.52 52.4%

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 45.6% 41.3% 32.5% 26.2% 50.7% 22.4% 26.9% 28.5% 39.0% 9.9%
RP MLB Percentile 62 84 6 2 97 54 2 36 21 97
RP MLB AVG 44.4% 34.5% 27.0% 38.5% 36.5% 22.8% 40.7% 29.9% 43.1% 6.5%
Career 48.3% 40.2% 30.8% 29.0% 49.9% 22.2% 27.9% 27.3% 41.9% 7.8%

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 54.4% 11.9% 33.8% 13.2% 60.6% 49.5% 23.5% 25.2% 14.6%
RP MLB Percentile 3 50 89 27 48 49 81 38 20
RP MLB AVG 58.5% 12.4% 29.6% 14.4% 60.6% 49.8% 21.0% 26.4% 19.1%
Career 56.0% 12.1% 32.5% 13.3% 62.6% 50.3% 23.1% 24.6% 16.3%

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 447 4.74 41.2% 18.3% 40.5% 0.7% 6.5% -4.5 -2 4.39
RP MLB Percentile 44 12 9 66 16 16 14 85 72 16
RP MLB AVG 494 4.93 45.8% 17.2% 37.0% 8.9% 4.6% 0.9 +0 3.55
Career 1,415 4.84 44.1% 17.0% 38.9% 5.2% 6.3% -13.6 -7 3.97
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