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Isaac MattsonIL
P · Pittsburgh Pirates
| Position | P |
| Bats/Throws | R/R |
| Height | 6′ 2″ |
| Weight | 214 lbs |
| Age | 31 |
| Birthplace | Erie, PA, USA |
| Draft | 2017, Los Angeles Angels, Round: 19, Overall Pick: 565 |
| School | Pittsburgh |
| MLB Debut | 2021-05-07 |
Contract Status
Service Time
0.161
1/1/2026
Options
2
1/1/2026
MLB FA
2032
2026 Service Time Gained: 0.118
2026 Option Year Used? Yes
Contract
2026 Salary$792,400 (Estimate)
League Minimum2026–2027
Arbitration Eligible2028–2031
Free Agent2032
Pitch Arsenal
| Pitch | Pitches | Velocity | V-Move | H-Move | Spin | Whiff% |
|---|---|---|---|---|---|---|
| Four-Seam Fastball | 693 | 94.1 | -12.9″ | 9.3″ | 2354 | 23.5% |
| Slider | 177 | 84.6 | -35.3″ | -3.2″ | 2212 | 36.1% |
| Changeup | 106 | 86.1 | -31.3″ | 9.0″ | 1255 | 14.7% |
| Sweeper | 74 | 82.8 | -41.0″ | -10.3″ | 2318 | 32.4% |
Summary
| G | GS | IP | W | L | ERA | K | K% | BB% | HR/9 | WHIP | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 (MLB) | 38 | 0 | 38.2 | 0 | 0 | 5.35 | 36 | 20.5% | 10.2% | 0.70 | 1.600 |
| MLB Career | 89 | 0 | 96.0 | 3 | 3 | 3.94 | 90 | 21.4% | 11.2% | 0.66 | 1.375 |
Last 10 Games
| Date | Lvl | Team | Opp | IP | H | ER | BB | SO | HR | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-09-05 | MLB | Pittsburgh Pirates | vs Los Angeles Angels | 2.0 | 4 | 3 | 0 | 2 | 0 | 5.35 | 1.600 |
| 2026-08-29 | AAA | Indianapolis Indians | vs Columbus Clippers | 2.1 | 1 | 0 | 1 | 3 | 0 | 1.33 | 1.130 |
| 2026-08-25 | AAA | Indianapolis Indians | vs Columbus Clippers | 3.0 | 0 | 0 | 0 | 3 | 0 | 1.50 | 1.170 |
| 2026-08-21 | AAA | Indianapolis Indians | vs Louisville Bats | 2.0 | 3 | 1 | 1 | 2 | 0 | 1.80 | 1.400 |
| 2026-08-17 | MLB | Pittsburgh Pirates | vs Detroit Tigers | 2.0 | 2 | 1 | 2 | 1 | 0 | 4.91 | 1.580 |
| 2026-08-09 | AAA | Indianapolis Indians | vs Iowa Cubs | 1.0 | 0 | 0 | 0 | 0 | 0 | 1.38 | 1.310 |
| 2026-08-06 | AAA | Indianapolis Indians | vs Iowa Cubs | 1.1 | 2 | 0 | 1 | 3 | 0 | 1.50 | 1.420 |
| 2026-08-04 | AAA | Indianapolis Indians | vs Iowa Cubs | 1.0 | 0 | 0 | 0 | 2 | 0 | 1.69 | 1.310 |
| 2026-07-28 | MLB | Pittsburgh Pirates | vs Arizona Diamondbacks | 1.2 | 3 | 1 | 1 | 3 | 0 | 4.93 | 1.560 |
| 2026-07-25 | MLB | Pittsburgh Pirates | vs Chicago Cubs | 0.1 | 4 | 3 | 1 | 1 | 0 | 4.91 | 1.520 |
| Last 10 Total | 16.2 | 19 | 9 | 7 | 20 | 0 | 4.86 | 1.560 | |||
Stats & Game Logs
| Year | Age | Lvl | Team | G | GS | IP | W | L | SV | ERA | K | BB | K% | BB% | HR/9 | WHIP | AVG | BABIP |
|---|
Season
| Date ↕ | Lvl ↕ | Team ↕ | Opponent | IP ↕ | H ↕ | ER ↕ | BB ↕ | SO ↕ | HR ↕ | ERA ↕ |
|---|
| Split | BF | IP | W | L | SV | ERA | K | BB | HR | WHIP | AVG |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | 176 | 38.2 | — | — | — | 5.350 | 36 | 18 | 3 | 1.603 | — |
| Recent Performance | |||||||||||
| Last 30 | 20 | 4.0 | 0 | 0 | 0 | 9.000 | 3 | 2 | 0 | 2.000 | .333 |
| Last 14 | 10 | 2.0 | 0 | 0 | 0 | 13.500 | 2 | 0 | 0 | 2.000 | .400 |
| Last 7 | 0 | 0.0 | 0 | 0 | 0 | — | 0 | 0 | 0 | .000 | .000 |
| Home / Away | |||||||||||
| Home Games | 110 | 24.0 | 0 | 0 | 0 | 5.250 | 22 | 12 | 0 | 1.630 | .278 |
| Away Games | 66 | 14.2 | 0 | 0 | 0 | 5.520 | 14 | 6 | 3 | 1.570 | .288 |
| Day / Night | |||||||||||
| Day Games | 88 | 19.2 | 0 | 0 | 0 | 4.120 | 17 | 11 | 0 | 1.530 | .250 |
| Night Games | 88 | 19.0 | 0 | 0 | 0 | 6.630 | 19 | 7 | 3 | 1.680 | .313 |
| vs Handedness | |||||||||||
| vs Left | 92 | 19.0 | — | — | — | nan | 17 | 11 | 2 | 1.890 | .313 |
| vs Right | 84 | 19.0 | — | — | — | nan | 19 | 7 | 1 | 1.370 | .250 |
| Role | |||||||||||
| Reliever | 176 | 38.2 | 0 | 0 | 0 | 5.350 | 36 | 18 | 3 | 1.600 | .282 |
| Runners | |||||||||||
| Bases Empty | 77 | 16.0 | — | — | — | nan | 17 | 10 | 1 | 1.810 | .284 |
| Runners On | 99 | 22.1 | — | — | — | nan | 19 | 8 | 2 | 1.480 | .281 |
| Scoring Position | 65 | 14.0 | — | — | — | nan | 15 | 7 | 0 | 1.640 | .286 |
| By Inning | |||||||||||
| Fourth Inning | 4 | 1.0 | — | — | — | .000 | 0 | 1 | 0 | 1.000 | .000 |
| Fifth Inning | 18 | 3.0 | — | — | — | 9.000 | 5 | 3 | 0 | 3.000 | .400 |
| Sixth Inning | 40 | 7.1 | — | — | — | 7.360 | 5 | 4 | 0 | 2.450 | .412 |
| Seventh Inning | 38 | 8.2 | — | — | — | 5.190 | 8 | 2 | 1 | 1.380 | .278 |
| Eighth Inning | 45 | 10.2 | — | — | — | 5.910 | 10 | 5 | 1 | 1.410 | .250 |
| Ninth Inning | 28 | 7.0 | — | — | — | 2.570 | 8 | 3 | 1 | 1.000 | .160 |
| Year | Age | Lv | Pit | BIP | Velo | Max V | GB% | FB% | LD% | PU% | O-Sw% | Z-Sw% | O-Con% | Z-Con% | Sw% | Con% | Zone% | F-Str% | CS% | Whiff% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | 21 | R-FCL | 417 | 62 | — | — | 53.2% | 29.0% | 12.9% | 4.8% | — | — | — | — | 51.3% | 56.1% | — | 65.3% | 16.1% | 43.9% |
| 2018 | 22 | A+ | 590 | 101 | — | — | 50.5% | 25.7% | 16.8% | 6.9% | — | — | — | — | 49.5% | 67.8% | — | 66.5% | 15.4% | 32.2% |
| 2018 | 22 | A | 912 | 175 | — | — | 44.6% | 32.0% | 16.6% | 6.9% | — | — | — | — | 47.0% | 81.8% | — | 58.4% | 17.1% | 18.2% |
| 2019 | 23 | AAA | 192 | 18 | — | — | 38.9% | 11.1% | 33.3% | 16.7% | — | — | — | — | 46.9% | 60.0% | — | 61.9% | 16.7% | 40.0% |
| 2019 | 23 | AA | 739 | 97 | — | — | 51.5% | 28.9% | 16.5% | 3.1% | — | — | — | — | 48.6% | 68.2% | — | 58.0% | 17.6% | 31.8% |
| 2019 | 23 | A+ | 327 | 37 | — | — | 45.9% | 27.0% | 10.8% | 16.2% | — | — | — | — | 50.8% | 59.6% | — | 64.5% | 18.3% | 40.4% |
| 2021 | 25 | MLB | 91 | 15 | 92.8 | 97.1 | 33.3% | 53.3% | 6.7% | 6.7% | 24.5% | 73.7% | 61.5% | 82.1% | 45.1% | 75.6% | 41.8% | 52.2% | 13.2% | 24.4% |
| 2021 | 25 | AAA | 323 | 50 | — | — | 32.0% | 34.0% | 32.0% | 2.0% | — | — | — | — | 54.8% | 63.3% | — | 60.5% | 12.4% | 36.7% |
| 2022 | 26 | AAA | 378 | 48 | 92.1 | 95.0 | 33.3% | 37.5% | 16.7% | 12.5% | 25.0% | 41.7% | 25.0% | 40.0% | 40.2% | 74.3% | 42.9% | 44.2% | 15.6% | 25.7% |
| 2023 | 27 | AA | 600 | 69 | — | — | 36.2% | 39.1% | 18.8% | 5.8% | — | — | — | — | 41.2% | 71.3% | — | 57.6% | 19.0% | 28.7% |
| 2024 | 28 | MLB | 100 | 11 | 94.0 | 96.8 | 54.5% | 18.2% | 18.2% | 9.1% | 25.5% | 71.1% | 64.3% | 81.2% | 46.0% | 76.1% | 45.0% | 47.8% | 16.0% | 23.9% |
| 2024 | 28 | AAA | 1022 | 146 | 92.8 | 97.0 | 33.6% | 30.1% | 21.9% | 14.4% | 29.4% | 70.3% | 58.4% | 77.8% | 49.4% | 71.9% | 48.8% | 61.7% | 15.5% | 28.1% |
| 2024 | 28 | AA | 179 | 26 | — | — | 50.0% | 23.1% | 19.2% | 7.7% | — | — | — | — | 46.9% | 71.4% | — | 55.6% | 16.2% | 28.6% |
| 2025 | 29 | MLB | 779 | 132 | 93.9 | 97.6 | 28.8% | 32.6% | 22.0% | 16.7% | 29.1% | 69.4% | 69.2% | 79.5% | 50.8% | 76.8% | 54.0% | 66.3% | 15.8% | 23.2% |
| 2025 | 29 | AAA | 321 | 53 | 93.9 | 98.3 | 43.4% | 20.8% | 24.5% | 11.3% | 26.7% | 67.4% | 56.4% | 78.8% | 48.9% | 73.2% | 54.5% | 64.3% | 17.8% | 26.8% |
| 2026 | 30 | MLB | 728 | 121 | 94.2 | 97.2 | 27.3% | 31.4% | 33.9% | 7.4% | 27.4% | 70.9% | 60.8% | 85.7% | 49.7% | 79.0% | 51.4% | 59.1% | 15.1% | 21.0% |
| 2026 | 30 | AAA | 322 | 48 | 94.0 | 96.9 | 47.9% | 29.2% | 20.8% | 2.1% | 35.7% | 70.7% | 49.2% | 72.7% | 50.9% | 63.4% | 43.5% | 67.9% | 12.4% | 36.6% |
| MLB Career | MLB | 1698 | 279 | 94.0 | 97.6 | 29.4% | 32.6% | 26.2% | 11.8% | 27.8% | 70.3% | 64.9% | 82.3% | 49.8% | 77.6% | 51.7% | 61.5% | 15.4% | 22.4% | |
| AAA Career | AAA | 2558 | 363 | 93.0 | 98.3 | 36.9% | 29.2% | 23.4% | 10.5% | 30.2% | 69.4% | 55.3% | 76.8% | 48.7% | 69.2% | 48.8% | 60.3% | 15.1% | 30.8% | |
| AA Career | AA | 1518 | 192 | — | — | 45.8% | 31.8% | 17.7% | 4.7% | — | — | — | — | 45.5% | 69.7% | — | 57.5% | 18.0% | 30.3% | |
| A+ Career | A+ | 917 | 138 | — | — | 49.3% | 26.1% | 15.2% | 9.4% | — | — | — | — | 49.9% | 64.8% | — | 65.8% | 16.5% | 35.2% | |
| A Career | A | 912 | 175 | — | — | 44.6% | 32.0% | 16.6% | 6.9% | — | — | — | — | 47.0% | 81.8% | — | 58.4% | 17.1% | 18.2% | |
| R-FCL Career | R-FCL | 417 | 62 | — | — | 53.2% | 29.0% | 12.9% | 4.8% | — | — | — | — | 51.3% | 56.1% | — | 65.3% | 16.1% | 43.9% |
Transaction History
2026-09-08Pittsburgh Pirates placed RHP Isaac Mattson on the 15-day injured list. Right hip impingement.
2026-09-04Pittsburgh Pirates recalled RHP Isaac Mattson from Indianapolis Indians.
2026-08-18Pittsburgh Pirates optioned RHP Isaac Mattson to Indianapolis Indians.
2026-08-13Pittsburgh Pirates recalled RHP Isaac Mattson from Indianapolis Indians.
2026-08-04Indianapolis Indians activated RHP Isaac Mattson.
2026-08-02Pittsburgh Pirates optioned RHP Isaac Mattson to Indianapolis Indians.
2026-08-01Pittsburgh Pirates recalled RHP Isaac Mattson from Indianapolis Indians.
2026-07-29Pittsburgh Pirates optioned RHP Isaac Mattson to Indianapolis Indians.
2026-06-13Pittsburgh Pirates recalled RHP Isaac Mattson from Indianapolis Indians.
2026-05-20Pittsburgh Pirates optioned RHP Isaac Mattson to Indianapolis Indians.
2026-05-20Indianapolis Indians activated RHP Isaac Mattson.
2026-04-16RHP Isaac Mattson changed number to 72.
2026-04-15RHP Isaac Mattson changed number to 42.
2025-09-16RHP Isaac Mattson changed number to 72.
2025-09-15RHP Isaac Mattson changed number to 21.
2025-06-07Pittsburgh Pirates recalled RHP Isaac Mattson from Indianapolis Indians.
2025-05-26Pittsburgh Pirates optioned RHP Isaac Mattson to Indianapolis Indians.
2025-05-20Pittsburgh Pirates selected the contract of RHP Isaac Mattson from Indianapolis Indians.
2025-01-13RHP Isaac Mattson roster status changed by Pittsburgh Pirates.
2024-11-18RHP Isaac Mattson assigned to Indianapolis Indians.
2024-11-18Pittsburgh Pirates signed free agent RHP Isaac Mattson to a minor league contract.
2024-11-04RHP Isaac Mattson elected free agency.
2024-11-04Pittsburgh Pirates sent RHP Isaac Mattson outright to Indianapolis Indians.
2024-09-19Pittsburgh Pirates selected the contract of RHP Isaac Mattson from Indianapolis Indians.
2024-09-18Indianapolis Indians activated RHP Isaac Mattson from the temporarily inactive list.
2024-09-14Indianapolis Indians placed RHP Isaac Mattson on the temporarily inactive list.
2024-05-07Indianapolis Indians activated RHP Isaac Mattson.
2024-05-07RHP Isaac Mattson assigned to Indianapolis Indians from Altoona Curve.
2024-02-24RHP Isaac Mattson assigned to Pittsburgh Pirates.
2023-12-20RHP Isaac Mattson assigned to Altoona Curve.
2023-12-11Pittsburgh Pirates signed free agent RHP Isaac Mattson to a minor league contract.
2023-11-06RHP Isaac Mattson elected free agency.
2023-09-05Wichita Wind Surge activated RHP Isaac Mattson.
2023-08-29Wichita Wind Surge transferred RHP Isaac Mattson to the Development List.
2023-06-22RHP Isaac Mattson assigned to Wichita Wind Surge.
2023-06-22Minnesota Twins signed free agent RHP Isaac Mattson to a minor league contract.
2022-07-18Norfolk Tides released RHP Isaac Mattson.
2022-07-01RHP Isaac Mattson assigned to Norfolk Tides from Bowie Baysox.
2022-06-29RHP Isaac Mattson assigned to Bowie Baysox from Norfolk Tides.
2022-04-08Baltimore Orioles sent RHP Isaac Mattson outright to Norfolk Tides.
2022-04-08Baltimore Orioles recalled RHP Isaac Mattson from Norfolk Tides.
2022-04-06Baltimore Orioles optioned RHP Isaac Mattson to Norfolk Tides.
2021-10-01Baltimore Orioles recalled RHP Isaac Mattson from Norfolk Tides.
2021-09-22Norfolk Tides activated RHP Isaac Mattson from the 7-day injured list.
2021-08-20Norfolk Tides placed RHP Isaac Mattson on the 7-day injured list.
2021-08-12Baltimore Orioles optioned RHP Isaac Mattson to Norfolk Tides.
2021-08-07Baltimore Orioles recalled RHP Isaac Mattson from Norfolk Tides.
2021-07-04Baltimore Orioles optioned RHP Isaac Mattson to Norfolk Tides.
2021-06-30Baltimore Orioles recalled RHP Isaac Mattson from Norfolk Tides.
2021-05-08Baltimore Orioles optioned RHP Isaac Mattson to Norfolk Tides.
2021-05-03Baltimore Orioles recalled RHP Isaac Mattson from Orioles Alternate Training Site.
2021-03-30P Isaac Mattson assigned to Orioles Alternate Training Site from Norfolk Tides.
2021-03-13Baltimore Orioles optioned P Isaac Mattson to Norfolk Tides.
2020-11-20Baltimore Orioles selected the contract of RHP Isaac Mattson from Bowie Baysox.
2020-11-20Baltimore Orioles selected the contract of RHP Isaac Mattson.
2020-10-01RHP Isaac Mattson assigned to Bowie Baysox from Orioles Alternate Training Site.
2020-07-17RHP Isaac Mattson assigned to Orioles Alternate Training Site from Bowie Baysox.
2020-07-10Baltimore Orioles invited non-roster RHP Isaac Mattson to spring training.
2020-03-07RHP Isaac Mattson assigned to Baltimore Orioles.
2019-12-05RHP Isaac Mattson assigned to Bowie Baysox.
2019-12-04Baltimore Orioles traded RHP Dylan Bundy to Los Angeles Angels for RHP Isaac Mattson, RHP Kyle Bradish, RHP Kyle Brnovich and RHP Zach Peek.
2019-08-19RHP Isaac Mattson assigned to Salt Lake Bees from Mobile BayBears.
2019-05-13RHP Isaac Mattson assigned to Mobile BayBears from Inland Empire 66ers.
2019-04-18RHP Isaac Mattson assigned to Inland Empire 66ers from Salt Lake Bees.
2019-04-15RHP Isaac Mattson assigned to Salt Lake Bees from Inland Empire 66ers.
2019-04-14Inland Empire 66ers activated RHP Isaac Mattson from the temporarily inactive list.
2019-04-10Inland Empire 66ers placed RHP Isaac Mattson on the temporarily inactive list.
2019-03-22RHP Isaac Mattson assigned to Los Angeles Angels.
2018-09-15Inland Empire 66ers activated RHP Isaac Mattson from the 7-day injured list.
2018-09-01Inland Empire 66ers placed RHP Isaac Mattson on the 7-day disabled list retroactive to August 31, 2018.
2018-07-02RHP Isaac Mattson assigned to Inland Empire 66ers from Burlington Bees.
2018-06-01RHP Isaac Mattson assigned to Burlington Bees from Angels Extended Spring Training.
2018-05-28RHP Isaac Mattson assigned to Angels Extended Spring Training from Burlington Bees.
2018-04-03RHP Isaac Mattson assigned to Burlington Bees from Orem Owlz.
2017-07-08RHP Isaac Mattson assigned to Orem Owlz from AZL Angels.
2017-06-25RHP Isaac Mattson assigned to AZL Angels from Orem Owlz.
2017-06-18RHP Isaac Mattson assigned to Orem Owlz.
2017-06-18Los Angeles Angels signed RHP Isaac Mattson.