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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 34.2 4.93 1.56 21.2% 10.3%
199th 2
Sv
175th 37.0
IP
244th 4.30
ERA
283rd 1.36
WHIP
201st 22.4%
K%
216th 9.9%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.1 11.0% 26.2% 49.1% 6.0% 4.80 4.50
218th 94.5
FB MPH
216th 12.1%
SwStr%
270th 28.5%
CSW%
240th 50.9%
Str-ICR
271st 4.7%
MTK%
280th 4.93
PLV
308th 3.50
PLA

Articles

7/29/2026Fantasy Baseball Relief Pitcher Roundup: 7/28Rick Graham

7/26/2026Fantasy Baseball Relief Pitcher Roundup: 7/25Rick Graham

7/20/2026Fantasy Baseball Relief Pitcher Roundup: 7/19Rick Graham

7/19/2026Fantasy Baseball Relief Pitcher Roundup: 7/18Rick Graham

7/14/2026Pirates 2026 All-Star Break Report CardsJoe Landolina

See More 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 36 0 34.2 0-0 0 8 4.93 1.56 5.29 3.82 4.95 4.50 21.2% 10.3% 9.9 0.78 .340 9.4% 70.9% 48.1% 29.5% 11.0% 26.2% 0.49 4.80
RP MLB Percentile 63 0 48 0-77 0 75 30 19 17 63 24 12 42 37 19 65 17 81 41 3 7 38 22 50 19
RP MLB AVG 29 2 37.0 2-2 2 5 4.30 1.36 4.29 4.31 4.34 3.50 22.4% 9.9% 8.3 1.15 .289 18.1% 72.5% 36.9% 43.7% 12.1% 28.5% 0.50 4.93
Career 87 0 92.0 3-3 0 20 3.72 1.35 4.20 3.83 4.79 4.06 21.6% 11.3% 7.7 0.68 .282 9.6% 75.3% 40.5% 31.9% 11.4% 26.9% 0.52 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 36 0 34.2 0-0 0 0 8 648 420 228 156 38 23 12 0 3 33 16 1 1
RP MLB Percentile 63 0 48 0-77 0 0 75 59 61 43 52 30 36 9 40 54 48 35 51 37
RP MLB AVG 29 2 37.0 2-2 0 2 5 619 395 224 159 34 22 6 1 5 36 15 2 1
Career 87 0 92.0 3-3 0 0 20 1,616 1,054 562 399 79 52 20 0 7 86 45 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 21.2% 10.3% .275 .428 .781 .343 .340 .358 .273 .361 .317 .420 90.3 94.5 17.6 5.29
RP MLB Percentile 42 37 21 35 31 28 17 23 15 17 15 13 11 4 22 17
RP MLB AVG 22.4% 9.9% .241 .392 .717 .316 .289 .320 .237 .318 .281 .361 87.7 89.3 13.2 4.29
Career 21.6% 11.3% .230 .349 .671 .300 .282 .302 .235 .320 .278 .355 88.8 92.7 20.6 4.20

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 PIT70.5% (94.1)--11.9% (84.2)7.7% (82.9)-9.7% (86.0)-- 70.5% 29.3%
RP MLB Percentile 98 (36) - - 18 (21) 14 (55) - 30 (41) - - 95.7% 4.0%
RP MLB AVG 38.2% (94.5) 26.0% (93.9) 20.6% (89.4) 25.5% (85.3) 21.4% (82.5) 16.7% (79.6) 17.3% (86.2) 18.5% (86.4) 32.3% (68.3) 48.3% 51.5%
Career74.1% (93.9)--10.2% (84.7)3.1% (82.9)1.2% (80.0)11.4% (85.9)-- 74.1% 25.9%

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 PIT27.6% (47)--26.0% (12)26.0% (8)-17.5% (4)-- 27.6% 23.2%
RP MLB Percentile 54 (11) - - 29 (45) 37 (53) - 31 (59) - - 48.2% 12.5%
RP MLB AVG 27.1% (22) 27.2% (9) 26.9% (11) 29.0% (18) 27.9% (15) 27.4% (10) 21.6% (14) 23.7% (16) 22.0% (8) 27.9% 28.7%
Career27.9% (128)--26.8% (26)26.0% (8)40.0% (2)19.6% (20)-- 27.9% 24.2%

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 29.5% 29.5% 30.5% 10.5% 48.6% 31.4% 34.3% 34.3% 22.2% 51.4% 27.6% 9.5% 11.4% 48.1%
RP MLB Percentile 7 7 86 60 2 7 55 95 95 2 24 11 9 3
RP MLB AVG 43.7% 21.7% 24.4% 10.2% 34.7% 40.9% 34.0% 25.1% 18.0% 62.8% 24.4% 5.8% 7.1% 36.9%
Career 31.9% 22.4% 27.8% 17.9% 39.9% 27.0% 38.4% 34.6% 22.0% 59.4% 23.6% 8.7% 8.4% 40.5%

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 .275 .343 .340 .358 .273 .361 .317 .420 90.3 94.5 17.6 9.4% 48.1% 32.7%
RP MLB Percentile 21 28 17 23 15 17 15 13 11 4 22 81 3 5
RP MLB AVG .241 .316 .289 .320 .237 .318 .281 .361 87.7 89.3 13.2 18.1% 36.9% 24.6%
Career .230 .300 .282 .302 .235 .320 .278 .355 88.8 92.7 20.6 9.6% 40.5% 26.8%

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 45.7% 64.8% 49.5% 31.8% 22.1% 22.2% 77.9% 84.1% 66.1% 15.3% 11.0% 26.2% 16.4% 59.0% 0.49 49.1%
RP MLB Percentile 63 63 71 54 27 95 27 52 17 32 38 22 39 58 50 31
RP MLB AVG 44.5% 63.6% 47.3% 31.5% 25.6% 18.0% 74.4% 83.8% 58.6% 16.3% 12.1% 28.5% 17.1% 58.2% 0.50 50.9%
Career 48.0% 65.2% 49.7% 30.2% 22.9% 22.0% 77.1% 81.9% 66.5% 15.5% 11.4% 26.9% 16.3% 60.3% 0.52 52.0%

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 45.7% 41.9% 31.8% 26.3% 49.5% 22.9% 27.7% 28.7% 39.4% 9.1%
RP MLB Percentile 63 87 6 2 95 47 3 39 21 97
RP MLB AVG 44.5% 34.7% 26.9% 38.4% 36.3% 22.9% 40.8% 29.9% 43.2% 6.6%
Career 48.0% 40.6% 30.7% 28.7% 49.5% 22.4% 28.1% 27.6% 41.7% 7.7%

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 54.3% 12.0% 33.6% 13.9% 56.4% 45.5% 20.7% 25.2% 15.1%
RP MLB Percentile 3 52 89 40 17 17 47 38 17
RP MLB AVG 58.6% 12.3% 29.7% 14.5% 60.7% 50.0% 21.1% 26.5% 19.2%
Career 55.8% 12.1% 32.6% 13.5% 60.7% 48.6% 22.1% 24.7% 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 648 4.80 42.4% 17.1% 40.4% 2.0% 6.0% 3.4 +4 4.50
RP MLB Percentile 59 19 17 46 16 16 20 34 22 12
RP MLB AVG 619 4.93 45.8% 17.3% 36.8% 9.0% 4.7% 0.7 0 3.50
Career 1,616 4.85 44.2% 16.7% 39.0% 5.2% 6.1% -5.7 0 4.06
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