Isaac Mattson | Pittsburgh Pirates
MLB Player
Isaac Mattson
Pittsburgh PiratesHeight6' 2"Weight214 lbsAge31Experience4th Season
0SVTied-261st
5.35ERA
36KTied-404th
1.60WHIP
Player Information
PositionRelief Pitcher
Jersey#72
Date of Birth14/7/1995
BirthplaceErie, PA
Experience4th Season
Draft2017: Rd 19, Pk 565 (LAA)
Bats / ThrowsRight/Right
MLB Debut2021
StatusActive
Next Game
vs Toronto Blue Jays
More Pittsburgh Pirates Players
Season, Postseason & Career
| Split | GP | GS | CG | SHO | IP | H | R | ER | HR | BB | K |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Regular Season | 38 | 0 | 0 | 0 | 38.2 | 44 | 23 | 23 | 3 | 18 | 36 |
| Career | 89 | 0 | 0 | 0 | 96.0 | 85 | 43 | 42 | 7 | 47 | 90 |
Pitching by Season
| Season | GP | GS | W | L | W% | WAR | ERA | WHIP | IP | K | BB | K/BB | H | R | ER | SV | HLD | BLSV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 4 | 0 | 0 | 0 | .000 | 0.0 | 6.23 | 2.31 | 4.1 | 3 | 5 | 0.6 | 5 | 3 | 3 | 0 | 0 | 0 |
| 2024 | 3 | 0 | 0 | 0 | .000 | 0.0 | 5.06 | 1.13 | 5.1 | 6 | 5 | 1.2 | 1 | 3 | 3 | 0 | 0 | 0 |
| 2025 | 44 | 0 | 3 | 3 | .500 | 1.5 | 2.45 | 1.13 | 47.2 | 45 | 19 | 2.4 | 35 | 14 | 13 | 0 | 12 | 3 |
| 2026 | 38 | 0 | 0 | 0 | .000 | 0.0 | 5.35 | 1.60 | 38.2 | 36 | 18 | 2.0 | 44 | 23 | 23 | 0 | 8 | 2 |
| Career | 89 | 0 | 3 | 3 | .500 | -- | 3.94 | 1.38 | 96.0 | 90 | 47 | 1.9 | 85 | 43 | 42 | 0 | 20 | 5 |
Opponent Batting by Season
| Season | P | TBF | P-TBF | OBA | OOBP | OSLUG | OOPS | 2B | 3B | HR | TB | RBI | BH | SH | SF | IBB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 91 | 23 | 3.957 | .278 | .435 | .333 | .768 | 1 | 0 | 0 | 6 | 3 | 0 | 0 | 0 | 0 |
| 2024 | 100 | 23 | 4.348 | .059 | .304 | .059 | .363 | 0 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 |
| 2025 | 777 | 198 | 3.924 | .203 | .286 | .314 | .600 | 7 | 0 | 4 | 54 | 18 | 2 | 2 | 3 | 2 |
| 2026 | 728 | 176 | 4.136 | .282 | .358 | .436 | .794 | 15 | 0 | 3 | 68 | 28 | 1 | 0 | 1 | 0 |
| Career | 1696 | 420 | 4.038 | .234 | .325 | .355 | .681 | 23 | 0 | 7 | 129 | 51 | 4 | 2 | 4 | 2 |
Expanded Pitching by Season
| Season | P/S | P/I | K/9 | QS | CG | SHO | GSC | GB | FB | G/F | IR | IRS | WP | BK | SB | CS | RSUP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 0.0 | 21.0 | 6.2 | 0 | 0 | 0 | 0.0 | 5 | 10 | 0.5 | 3 | 1 | 1 | 0 | 0 | 0 | 0.0 |
| 2024 | 0.0 | 18.8 | 10.1 | 0 | 0 | 0 | 0.0 | 6 | 5 | 1.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0.0 |
| 2025 | 0.0 | 16.3 | 8.5 | 0 | 0 | 0 | 0.0 | 38 | 94 | 0.4 | 18 | 6 | 0 | 0 | 0 | 0 | 0.0 |
| 2026 | 0.0 | 18.8 | 8.4 | 0 | 0 | 0 | 0.0 | 33 | 88 | 0.4 | 16 | 8 | 1 | 0 | 0 | 1 | 0.0 |
| Career | 0.0 | 17.7 | 8.4 | 0 | 0 | 0 | 0.0 | 82 | 197 | 0.4 | 37 | 15 | 2 | 0 | 0 | 1 | 0.0 |
Game Log
| Game | Result | IP | H | R | ER | HR | BB | K | GB | FB | P | TBF | GSC | Dec | Rel | ERA |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 vs LAA2026 Regular Season | L 6-1 | 2.0 | 4 | 3 | 3 | 0 | 0 | 2 | 3 | 5 | 39 | 10 | 0.0 | - | - | 5.35 |
 vs DET2026 Regular Season | L 8-5 | 2.0 | 2 | 1 | 1 | 0 | 2 | 1 | 3 | 4 | 41 | 10 | 0.0 | - | - | 4.91 |
 vs ARI2026 Regular Season | L 8-7 F/12 | 1.2 | 3 | 1 | 1 | 0 | 1 | 3 | 3 | 2 | 39 | 9 | 0.0 | - | - | 4.93 |
 vs CHC2026 Regular Season | L 11-0 | 0.1 | 4 | 3 | 3 | 0 | 1 | 1 | 0 | 4 | 26 | 6 | 0.0 | - | - | 4.91 |
 @ CLE2026 Regular Season | W 7-1 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 13 | 3 | 0.0 | - | - | 4.13 |
| @ CLE2026 Regular Season | W 7-1 | 1.0 | 1 | 0 | 0 | 0 | 0 | 2 | 1 | 1 | 20 | 4 | 0.0 | - | - | 4.26 |
 vs MIL2026 Regular Season | W 14-5 | 0.2 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 18 | 4 | 0.0 | - | - | 4.40 |
| vs MIL2026 Regular Season | W 3-2 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 24 | 4 | 0.0 | - | HLD(8) | 4.50 |
 vs ATL2026 Regular SeasonWeek 27 | L 3-0 | 1.0 | 2 | 1 | 1 | 0 | 0 | 1 | 1 | 3 | 12 | 5 | 0.0 | - | - | 4.66 |
 @ WSH2026 Regular SeasonWeek 27 | W 11-5 | 1.0 | 2 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 12 | 4 | 0.0 | - | - | 4.50 |
| @ WSH2026 Regular SeasonWeek 27 | L 9-5 | 1.1 | 3 | 4 | 4 | 2 | 1 | 1 | 2 | 4 | 37 | 8 | 0.0 | - | - | 4.67 |
 @ PHI2026 Regular SeasonWeek 26 | L 8-0 | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 9 | 3 | 0.0 | - | - | 3.51 |
 vs CIN2026 Regular SeasonWeek 26 | L 9-7 | 1.0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 13 | 3 | 0.0 | - | - | 3.60 |
| vs CIN2026 Regular SeasonWeek 26 | L 6-4 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 12 | 3 | 0.0 | - | - | 3.75 |
 vs SEA2026 Regular SeasonWeek 25 | L 3-2 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 13 | 3 | 0.0 | - | - | 3.91 |
 @ ATH2026 Regular SeasonWeek 24 | W 12-4 | 1.0 | 1 | 1 | 1 | 1 | 0 | 2 | 0 | 2 | 16 | 4 | 0.0 | - | - | 4.09 |
 vs MIA2026 Regular SeasonWeek 24 | L 4-2 | 1.1 | 0 | 0 | 0 | 0 | 2 | 1 | 1 | 2 | 27 | 6 | 0.0 | - | - | 3.86 |
| vs PHI2026 Regular SeasonWeek 20 | L 6-0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 15 | 5 | 0.0 | - | - | 4.12 |
| vs PHI2026 Regular SeasonWeek 20 | L 6-0 | 1.1 | 0 | 0 | 0 | 0 | 1 | 2 | 1 | 1 | 25 | 5 | 0.0 | - | - | 4.34 |
 @ SF2026 Regular SeasonWeek 19 | L 7-6 F/12 | 0.1 | 3 | 2 | 2 | 0 | 0 | 0 | 1 | 3 | 18 | 4 | 0.0 | - | BLSV(2) | 4.67 |
| @ ARI2026 Regular SeasonWeek 19 | W 4-2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 6 | 1 | 0.0 | - | HLD(7) | 3.71 |
 vs STL2026 Regular SeasonWeek 18 | L 10-5 | 0.2 | 3 | 5 | 5 | 0 | 2 | 0 | 0 | 5 | 31 | 7 | 0.0 | - | - | 3.78 |
| vs STL2026 Regular SeasonWeek 17 | L 4-2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 3 | 1 | 0.0 | - | HLD(6) | 1.13 |
| @ MIL2026 Regular SeasonWeek 17 | W 6-3 F/10 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 4 | 3 | 0.0 | - | BLSV(1) | 1.15 |
| @ MIL2026 Regular SeasonWeek 17 | W 6-0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 2 | 14 | 4 | 0.0 | - | - | 1.23 |
 vs TB2026 Regular SeasonWeek 16 | W 6-3 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 8 | 3 | 0.0 | - | HLD(5) | 1.32 |
| vs TB2026 Regular SeasonWeek 16 | L 8-7 F/13 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 13 | 3 | 0.0 | - | - | 1.42 |
| vs WSH2026 Regular SeasonWeek 16 | L 8-7 F/10 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 2 | 18 | 4 | 0.0 | - | - | 1.54 |
| vs WSH2026 Regular SeasonWeek 15 | L 5-4 | 2.0 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | 33 | 7 | 0.0 | - | - | 1.69 |
| @ CHC2026 Regular SeasonWeek 15 | W 4-3 F/11 | 1.0 | 2 | 0 | 0 | 0 | 0 | 1 | 1 | 3 | 24 | 5 | 0.0 | - | HLD(4) | 2.08 |
| @ CHC2026 Regular SeasonWeek 15 | W 2-0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 3 | 12 | 4 | 0.0 | - | HLD(3) | 2.35 |
 vs SD2026 Regular SeasonWeek 14 | W 7-1 | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 9 | 3 | 0.0 | - | HLD(2) | 2.70 |
| vs SD2026 Regular SeasonWeek 14 | L 5-0 | 1.0 | 2 | 0 | 0 | 0 | 0 | 2 | 1 | 2 | 21 | 5 | 0.0 | - | - | 3.00 |
 vs BAL2026 Regular SeasonWeek 14 | W 3-2 | 1.0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 2 | 17 | 4 | 0.0 | - | - | 3.60 |
| @ CIN2026 Regular SeasonWeek 13 | W 8-3 | 1.1 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | 22 | 5 | 0.0 | - | HLD(1) | 4.50 |
| @ CIN2026 Regular SeasonWeek 13 | L 2-0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 2 | 15 | 4 | 0.0 | - | - | 6.75 |
 @ NYM2026 Regular SeasonWeek 13 | W 4-3 F/10 | 1.0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 13 | 3 | 0.0 | - | - | 10.80 |
| @ NYM2026 Regular SeasonWeek 13 | L 11-7 | 0.2 | 3 | 2 | 2 | 0 | 2 | 1 | 2 | 2 | 36 | 7 | 0.0 | - | - | 27.00 |