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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", 215 lb
Hometown Erie, PA

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 16.0 1.13 1.19 18.5% 10.8%
96th 1
Sv
43rd 10.0
IP
40th 5.21
ERA
127th 1.53
WHIP
254th 22.1%
K%
187th 11.0%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
93.6 8.4% 24.4% 46.2% 3.8% 4.94 3.43
202nd 94.2
FB MPH
275th 12.0%
SwStr%
300th 28.6%
CSW%
274th 49.8%
Str-ICR
167th 4.2%
MTK%
211th 4.97
PLV
200th 3.58
PLA
Holds List
Rank
99th

Articles

4/28/2026Fantasy Baseball Relief Pitcher Roundup: 4/27Rick Graham

4/28/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/28Rick Graham

4/27/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/27Rick Graham

4/26/2026Fantasy Baseball Relief Pitcher Roundup: 4/25Rick Graham

4/26/2026Relief Pitcher Streamer Rankings Fantasy Baseball: 4/26Rick Graham

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 16 0 16.0 0-0 0 6 1.13 1.19 4.29 2.94 5.10 3.43 18.5% 10.8% 6.8 0.00 .261 0.0% 89.5% 50.0% 24.4% 8.4% 24.4% 0.41 4.94
RP MLB Percentile 97 0 87 0-43 0 95 89 64 43 73 25 43 28 46 63 68 60 70 83 10 8 22 13 26 38
RP MLB AVG 8 0 10.0 1-1 1 1 5.21 1.53 4.85 4.86 4.64 3.58 22.1% 11.0% 9.1 1.29 .301 18.9% 71.5% 38.3% 43.9% 12.0% 28.6% 0.49 4.97
Career 67 0 73.1 3-3 0 18 2.58 1.21 3.70 3.64 4.79 3.71 21.1% 11.7% 6.5 0.49 .247 7.1% 81.0% 38.7% 31.5% 11.0% 26.7% 0.51 4.89

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 16 0 16.0 0-0 0 0 6 262 167 95 65 12 11 1 0 0 12 7 0 0
RP MLB Percentile 97 0 87 0-43 0 0 95 86 86 16 85 24 13 50 13 68 54 18 40 36
RP MLB AVG 8 0 10.0 1-1 0 1 1 180 114 67 46 10 7 2 0 1 10 5 1 1
Career 67 0 73.1 3-3 0 0 18 1,230 801 429 308 53 40 9 0 4 65 36 3 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 18.5% 10.8% .211 .228 .520 .249 .261 .261 .268 .333 .318 .364 89.8 91.1 21.8 4.29
RP MLB Percentile 28 46 62 88 84 81 60 71 25 43 30 46 34 45 15 43
RP MLB AVG 22.1% 11.0% .249 .407 .747 .332 .301 .332 .243 .333 .289 .377 88.4 89.7 13.2 4.85
Career 21.1% 11.7% .202 .281 .582 .270 .247 .262 .223 .305 .267 .326 88.2 91.2 22.4 3.70

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 81.3% (93.6) - - 2.3% (87.3) - 6.1% (83.6) 9.9% (85.8) - - 81.3% 18.3%
RP MLB Percentile 100 (35) - - 0 (67) - 8 (76) 23 (45) - - 99.2% 0.3%
RP MLB AVG 34.9% (94.2) 27.0% (93.8) 20.5% (89.3) 27.6% (85.6) 23.1% (82.5) 18.2% (80.8) 18.9% (86.0) 19.9% (86.4) - (-) 47.5% 52.4%
Career 77.5% (93.7) - - 7.6% (85.3) - 2.9% (81.6) 12.0% (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 24.4% (17) - - 16.7% (1) - 37.5% (3) 19.2% (1) - - 24.4% 25.0%
RP MLB Percentile 39 (5) - - 8 (78) - 80 (45) 34 (72) - - 22.8% 26.8%
RP MLB AVG 26.6% (6) 28.1% (3) 28.0% (4) 30.5% (7) 28.6% (6) 28.2% (4) 22.3% (5) 25.1% (7) - (-) 28.0% 28.6%
Career 27.3% (98) - - 26.9% (15) - 38.9% (5) 20.4% (17) - - 27.3% 25.0%

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 24.4% 28.9% 33.3% 13.3% 46.7% 28.9% 24.4% 46.7% 21.8% 48.9% 33.3% 11.1% 6.7% 50.0%
RP MLB Percentile 8 20 81 70 11 13 18 99 88 9 13 13 52 10
RP MLB AVG 43.9% 21.8% 24.4% 10.0% 35.0% 42.1% 33.2% 24.7% 17.4% 61.6% 24.6% 5.8% 8.1% 38.3%
Career 31.5% 20.2% 27.6% 20.7% 36.9% 25.1% 37.4% 37.4% 21.8% 61.0% 23.6% 8.9% 6.4% 38.7%

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 .211 .249 .261 .261 .268 .333 .318 .364 89.8 91.1 21.8 0.0% 50.0% 35.4%
RP MLB Percentile 62 81 60 71 25 43 30 46 34 45 15 70 10 7
RP MLB AVG .249 .332 .301 .332 .243 .333 .289 .377 88.4 89.7 13.2 18.9% 38.3% 25.1%
Career .202 .270 .247 .262 .223 .305 .267 .326 88.2 91.2 22.4 7.1% 38.7% 25.6%

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 44.7% 63.7% 47.7% 30.3% 17.6% 21.8% 82.4% 86.3% 75.0% 16.0% 8.4% 24.4% 17.6% 59.2% 0.41 46.2%
RP MLB Percentile 48 51 63 50 18 88 18 39 12 35 22 13 64 58 26 22
RP MLB AVG 44.1% 62.8% 46.2% 30.5% 25.7% 17.4% 74.3% 83.7% 58.5% 16.6% 12.0% 28.6% 16.9% 57.3% 0.49 49.8%
Career 48.5% 65.1% 49.3% 29.3% 22.2% 21.8% 77.8% 81.7% 68.8% 15.8% 11.0% 26.7% 16.6% 60.8% 0.51 52.3%

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 44.7% 39.5% 31.0% 29.5% 51.7% 21.5% 26.8% 29.1% 39.8% 8.0%
RP MLB Percentile 48 73 15 11 95 62 3 42 27 77
RP MLB AVG 44.1% 34.8% 26.5% 38.7% 36.3% 22.8% 40.9% 30.4% 43.2% 6.3%
Career 48.5% 39.7% 30.2% 30.1% 50.0% 22.0% 28.1% 27.3% 42.6% 7.1%

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 55.7% 13.0% 31.3% 15.1% 56.9% 44.6% 21.2% 25.6% 14.6%
RP MLB Percentile 22 45 65 70 32 25 49 48 17
RP MLB AVG 58.5% 13.1% 29.0% 13.8% 59.4% 49.5% 21.1% 26.4% 19.7%
Career 56.5% 12.4% 31.8% 13.7% 62.1% 49.3% 22.6% 24.6% 16.6%

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 262 4.94 44.7% 16.0% 39.3% 5.3% 3.8% -3.5 +1 3.43
RP MLB Percentile 86 38 31 40 24 24 51 94 51 43
RP MLB AVG 180 4.97 46.1% 17.9% 36.1% 10.0% 4.2% 1.5 +1 3.58
Career 1,230 4.89 45.3% 16.3% 38.4% 6.9% 5.7% -12.6 -4 3.71
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