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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%
130th 1
Sv
130th 18.0
IP
184th 4.59
ERA
211th 1.44
WHIP
265th 22.1%
K%
227th 10.8%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
93.8 9.5% 24.6% 46.2% 5.6% 4.79 4.39
206th 94.1
FB MPH
263rd 11.9%
SwStr%
307th 28.5%
CSW%
295th 50.4%
Str-ICR
248th 4.5%
MTK%
277th 4.93
PLV
281st 3.51
PLA
Holds List
Rank
114th

Articles

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5/18/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 5/18Rick Graham

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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 4.88 3.27 5.51 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 80 0 60 0-58 0 92 48 40 31 72 17 21 25 35 41 79 40 79 46 3 5 25 13 32 19
RP MLB AVG 14 1 18.0 1-1 1 2 4.59 1.44 4.38 4.37 4.39 3.51 22.1% 10.8% 8.6 1.05 .294 17.2% 71.5% 37.3% 44.5% 11.9% 28.5% 0.49 4.93
Career 72 0 77.0 3-3 0 19 3.27 1.29 3.88 3.69 4.89 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 80 0 60 0-58 0 0 92 75 74 27 66 27 25 7 21 79 46 22 23 47
RP MLB AVG 14 1 18.0 1-1 0 1 2 302 191 111 77 16 11 3 0 2 17 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 4.88
RP MLB Percentile 25 35 44 64 57 53 40 54 23 31 27 38 19 28 11 31
RP MLB AVG 22.1% 10.8% .243 .386 .718 .322 .294 .322 .238 .324 .285 .363 88.1 89.3 13.0 4.38
Career 20.6% 11.8% .214 .306 .620 .286 .263 .276 .226 .313 .269 .333 88.6 91.6 22.0 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 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 (42) - 13 (73) 25 (41) - - 98.9% 0.9%
RP MLB AVG 36.1% (94.1) 26.7% (93.9) 20.8% (89.3) 26.6% (85.6) 22.9% (82.4) 17.2% (80.4) 18.6% (86.0) 19.8% (86.3) 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 36 (7) - - 32 (59) - 70 (50) 30 (76) - - 24.0% 26.0%
RP MLB AVG 26.5% (10) 27.8% (5) 27.0% (6) 30.1% (10) 27.8% (9) 26.8% (6) 22.2% (8) 25.7% (10) 23.3% (6) 28.1% 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 5 11 85 66 2 5 38 99 91 3 13 8 32 3
RP MLB AVG 44.5% 21.4% 23.9% 10.2% 34.1% 41.3% 33.8% 24.9% 17.5% 62.4% 24.4% 6.0% 7.1% 37.3%
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 44 53 40 54 23 31 27 38 19 28 11 79 3 3
RP MLB AVG .243 .322 .294 .322 .238 .324 .285 .363 88.1 89.3 13.0 17.2% 37.3% 24.5%
Career .214 .286 .263 .276 .226 .313 .269 .333 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 55 69 54 19 91 19 38 14 29 25 13 49 55 32 16
RP MLB AVG 44.3% 62.9% 46.3% 30.6% 25.6% 17.5% 74.4% 83.8% 58.5% 16.6% 11.9% 28.5% 16.9% 57.6% 0.49 50.4%
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 86 11 5 98 66 2 44 26 75
RP MLB AVG 44.3% 34.8% 26.7% 38.5% 36.2% 22.8% 41.0% 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 82 36 38 33 54 52 11
RP MLB AVG 58.5% 12.8% 29.3% 14.1% 60.0% 49.5% 21.2% 26.1% 19.3%
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 75 19 31 19 16 16 29 65 31 21
RP MLB AVG 302 4.93 46.1% 16.8% 37.0% 9.1% 4.5% 0.4 +0 3.51
Career 1,325 4.86 45.1% 15.8% 39.0% 6.1% 6.0% -10.3 -3 3.94
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