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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 32.2 4.13 1.38 20.6% 9.9%
188th 2
Sv
182nd 34.0
IP
193rd 4.31
ERA
225th 1.36
WHIP
224th 22.4%
K%
203rd 10.0%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.1 10.6% 26.2% 50.1% 6.5% 4.83 4.19
214th 94.5
FB MPH
230th 12.1%
SwStr%
272nd 28.5%
CSW%
212th 50.8%
Str-ICR
314th 4.7%
MTK%
273rd 4.93
PLV
290th 3.55
PLA

Articles

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

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

7/13/2026Fantasy Baseball Relief Pitcher Roundup: 7/12Rick Graham

7/12/2026Fantasy Baseball Relief Pitcher Roundup: 7/11Rick Graham

7/9/2026Fantasy Baseball Relief Pitcher Roundup: 7/8Rick Graham

See More Articles
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Isaac Mattson Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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 34 0 32.2 0-0 0 8 4.13 1.38 4.60 3.91 5.06 4.19 20.6% 9.9% 8.5 0.83 .298 9.7% 74.2% 45.4% 29.2% 10.6% 26.2% 0.50 4.83
RP MLB Percentile 63 0 47 0-75 0 77 45 35 26 58 21 17 35 40 38 63 41 81 56 6 7 32 21 51 21
RP MLB AVG 27 1 34.0 2-2 2 4 4.31 1.36 4.32 4.35 4.39 3.55 22.4% 10.0% 8.3 1.16 .289 18.3% 72.5% 37.1% 43.6% 12.1% 28.5% 0.50 4.93
Career 85 0 90.0 3-3 0 20 3.40 1.28 3.92 3.86 4.82 3.93 21.4% 11.2% 7.2 0.70 .264 9.7% 76.9% 39.2% 31.9% 11.3% 27.0% 0.52 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 34 0 32.2 0-0 0 0 8 583 380 203 141 31 20 8 0 3 29 14 1 1
RP MLB Percentile 63 0 47 0-75 0 0 77 56 57 47 49 39 41 19 38 49 42 39 48 34
RP MLB AVG 27 1 34.0 2-2 0 2 4 579 369 210 149 31 21 6 1 4 33 14 2 1
Career 85 0 90.0 3-3 0 0 20 1,551 1,014 537 384 72 49 16 0 7 82 43 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 20.6% 9.9% .248 .384 .710 .316 .298 .320 .247 .337 .278 .382 89.3 94.2 18.5 4.60
RP MLB Percentile 35 40 39 47 46 45 41 49 30 26 47 29 26 5 18 26
RP MLB AVG 22.4% 10.0% .241 .392 .717 .317 .289 .320 .237 .319 .281 .361 87.7 89.3 13.3 4.32
Career 21.4% 11.2% .218 .329 .641 .289 .264 .285 .224 .310 .262 .338 88.4 92.6 21.1 3.92

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 PIT72.6% (94.1)--11.0% (83.8)6.9% (82.9)-9.4% (85.9)-- 72.6% 27.3%
RP MLB Percentile 98 (37) - - 16 (18) 12 (54) - 29 (39) - - 97.4% 2.3%
RP MLB AVG 38.1% (94.5) 25.8% (94.0) 20.7% (89.4) 25.5% (85.4) 21.4% (82.5) 16.4% (80.0) 17.2% (86.3) 18.5% (86.4) 32.3% (68.2) 48.3% 51.5%
Career75.0% (93.9)--9.7% (84.6)2.6% (82.9)1.3% (80.0)11.4% (85.8)-- 75.0% 25.0%

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 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 PIT28.1% (45)--29.7% (11)15.0% (3)-16.4% (3)-- 28.1% 21.4%
RP MLB Percentile 57 (9) - - 52 (45) 5 (73) - 25 (62) - - 54.0% 4.6%
RP MLB AVG 27.0% (20) 27.0% (8) 27.1% (10) 29.2% (17) 28.2% (14) 27.6% (9) 21.6% (13) 23.7% (15) 23.8% (8) 27.8% 28.8%
Career28.1% (126)--28.5% (25)15.0% (3)40.0% (2)19.3% (19)-- 28.1% 23.5%

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 29.2% 27.1% 32.3% 11.5% 46.9% 29.2% 34.4% 36.5% 22.3% 54.2% 26.0% 9.4% 10.4% 45.4%
RP MLB Percentile 7 15 90 68 4 3 63 96 96 4 31 11 14 6
RP MLB AVG 43.6% 21.7% 24.4% 10.3% 34.6% 41.0% 33.9% 25.1% 17.9% 62.6% 24.4% 5.9% 7.1% 37.1%
Career 31.9% 21.3% 28.3% 18.5% 39.0% 26.0% 38.6% 35.4% 22.0% 60.6% 22.8% 8.7% 7.9% 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 .248 .316 .298 .320 .247 .337 .278 .382 89.3 94.2 18.5 9.7% 45.4% 31.2%
RP MLB Percentile 39 45 41 49 30 26 47 29 26 5 18 81 6 6
RP MLB AVG .241 .317 .289 .320 .237 .319 .281 .361 87.7 89.3 13.3 18.3% 37.1% 24.6%
Career .218 .289 .264 .285 .224 .310 .262 .338 88.4 92.6 21.1 9.7% 39.2% 26.0%

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% 65.2% 49.6% 32.2% 21.5% 22.3% 78.5% 84.9% 66.7% 15.6% 10.6% 26.2% 16.6% 59.9% 0.50 50.1%
RP MLB Percentile 66 69 76 59 24 96 24 47 16 35 32 21 43 69 51 38
RP MLB AVG 44.5% 63.5% 47.2% 31.4% 25.6% 17.9% 74.4% 83.8% 58.4% 16.4% 12.1% 28.5% 17.1% 58.1% 0.50 50.8%
Career 48.0% 65.4% 49.7% 30.3% 22.7% 22.0% 77.3% 82.1% 66.8% 15.7% 11.3% 27.0% 16.4% 60.7% 0.52 52.5%

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% 42.4% 31.8% 25.8% 50.0% 22.7% 27.3% 29.2% 39.0% 9.5%
RP MLB Percentile 66 87 4 1 96 52 3 42 17 99
RP MLB AVG 44.5% 34.7% 27.0% 38.4% 36.4% 22.9% 40.7% 30.0% 43.0% 6.6%
Career 48.0% 40.8% 30.6% 28.6% 49.7% 22.3% 28.0% 27.7% 41.7% 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 54.2% 11.7% 34.1% 13.9% 58.2% 46.8% 21.8% 25.1% 14.6%
RP MLB Percentile 4 61 91 39 33 30 57 37 15
RP MLB AVG 58.5% 12.3% 29.7% 14.5% 60.8% 50.0% 21.1% 26.5% 19.2%
Career 55.8% 12.0% 32.8% 13.5% 61.5% 49.2% 22.5% 24.6% 16.1%

Isaac Mattson PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
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 583 4.83 42.2% 17.5% 40.3% 1.9% 6.5% -0.4 +0 4.19
RP MLB Percentile 56 21 13 56 14 14 10 53 41 17
RP MLB AVG 579 4.93 45.8% 17.3% 36.8% 9.0% 4.7% 0.9 0 3.55
Career 1,551 4.86 44.2% 16.8% 38.9% 5.3% 6.3% -9.6 -4 3.93
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