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Isaac Mattson
MLB
About Isaac Mattson
Isaac Gerald Mattson (born July 14, 1995) is an American professional baseball pitcher for the Pittsburgh Pirates of Major League Baseball (MLB). He has previously played in MLB for the Baltimore Orioles.
Bio summary from Wikipedia.
Player Stats
| W | 0 | L | 0 | ERA | 5.35 | G | 38 |
|---|---|---|---|---|---|---|---|
| GS | 0 | SV | 0 | IP | 38.2 | H | 44 |
| R | 23 | ER | 23 | BB | 18 | SO | 36 |
| WHIP | 1.603 | H/9 | 10.2 | HR/9 | 0.7 | BB/9 | 4.2 |
| K/9 | 8.4 | FIP | 3.72 | WAR | 0.0 |
2026 pitching — Baseball-Reference
Career — Lahman, through 2025
Pitching
| Year | Team | W | L | ERA | G | GS | CG | SHO | SV | IP | H | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | BAL | 0 | 0 | 6.23 | 4 | 0 | 0 | 0 | 0 | 4.1 | 5 | 0 | 5 | 3 |
| 2024 | PIT | 0 | 0 | 5.06 | 3 | 0 | 0 | 0 | 0 | 5.1 | 1 | 0 | 5 | 6 |
| 2025 | PIT | 3 | 3 | 2.45 | 44 | 0 | 0 | 0 | 0 | 47.2 | 35 | 4 | 19 | 45 |
Season lines from the Lahman Baseball Database (Version 2025, via SABR), joined through the Chadwick Register ID crosswalk. The databank runs through the 2025 season — the current season is the 2026 line below, from the MLB Stats API.
2026 Season — MLB Stats API
Pitching
| W | L | ERA | G | GS | CG | SHO | SV | IP | H | R | ER | HR | BB | SO | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 5.35 | 38 | 0 | 0 | 0 | 0 | 38.2 | 44 | 23 | 23 | 3 | 18 | 36 | 1.60 |
2026 regular-season line from the MLB Stats API (statsapi.mlb.com), pulled when this page was built. Multi-team stints are combined; rate stats are recomputed from the combined totals.
Watch Isaac Mattson Highlights
“Isaac Mattson 2026 MLB Highlights!” · Open on YouTube · More Isaac Mattson videos