Isaac Mattson stats and game log
Isaac Mattson is the Pittsburgh Pirates relief pitcher (No. 72). In the 2026 regular season through September 5, 2026, Isaac Mattson has played 38 games: 38.2 innings, 36 strikeouts and a 5.35 ERA.
Research summary
- Recent form: 1.6 strikeouts per game over the last 5 games, against 0.9 over the season (38 games).
- Role: 1.1 innings per game over the last 5 games, against 1.0 over the season.
- Consistency: at or above the season average (0.9 strikeouts) in 27 of 38 games.
- Home and road: 1 strikeouts per game at home (22 games), 0.9 on the road (16).
Figures are MLB regular-season games; samples are stated and small samples move quickly.
Team: Pittsburgh Pirates stats and results.
6'2" · 214 lb
2026 regular season
| Games | IP | H | ER | BB | K | HR | PIT | |
|---|---|---|---|---|---|---|---|---|
| 2026 per game | 38 | 1.0 | 1.2 | 0.6 | 0.5 | 0.9 | 0.1 | 19.2 |
| 2026 totals | 38 | 38.2 | 44 | 23 | 18 | 36 | 3 | 728 |
2025 regular season
44 regular-season games in 2025 for comparison. Playoff games are not in these figures.
| Games | IP | H | R | ER | BB | K | HR | HB | |
|---|---|---|---|---|---|---|---|---|---|
| 2025 per game | 44 | 1.0 | 0.8 | 0.3 | 0.3 | 0.4 | 1 | 0.1 | 0 |
| 2025 totals | 44 | 47.2 | 35 | 14 | 13 | 19 | 45 | 4 | 2 |
Rates in 2026
Isaac Mattson has pitched 38.2 innings in 38 games (0 starts) with 36 strikeouts and a 5.35 ERA.
| Measure | Value |
|---|---|
| ERA (earned runs per 9 innings) | 5.35 |
| WHIP (walks and hits per inning) | 1.60 |
| Strikeouts per 9 innings | 8.4 |
| Strikeout-to-walk ratio | 2.00 |
| Starts | 0 |
Home, road and recent form, 2026
| Split | Games | K/g | IP/g | ER/g |
|---|---|---|---|---|
| Home | 22 | 1 | 1.0 | 0.6 |
| Road | 16 | 0.9 | 1.0 | 0.6 |
| Last 5 games | 5 | 1.6 | 1.1 | 1.6 |
| Season | 38 | 0.9 | 1.0 | 0.6 |
Game log
| Date | Opponent | Result | IP | H | ER | BB | K | HR | PIT |
|---|---|---|---|---|---|---|---|---|---|
| Sep 5, 2026 | vs LAA | L | 2.0 | 4 | 3 | 0 | 2 | 0 | 39 |
| Aug 17, 2026 | vs DET | L | 2.0 | 2 | 1 | 2 | 1 | 0 | 41 |
| Jul 28, 2026 | vs ARI | L | 1.2 | 3 | 1 | 1 | 3 | 0 | 39 |
| Jul 25, 2026 | vs CHC | L | 0.1 | 4 | 3 | 1 | 1 | 0 | 26 |
| Jul 19, 2026 | @ CLE | W | 1.0 | 0 | 0 | 0 | 1 | 0 | 13 |
| Jul 18, 2026 | @ CLE | W | 1.0 | 1 | 0 | 0 | 2 | 0 | 20 |
| Jul 12, 2026 | vs MIL | W | 0.2 | 1 | 0 | 1 | 1 | 0 | 18 |
| Jul 11, 2026 | vs MIL | W | 1.0 | 1 | 0 | 0 | 0 | 0 | 24 |
| Jul 8, 2026 | vs ATL | L | 1.0 | 2 | 1 | 0 | 1 | 0 | 12 |
| Jul 5, 2026 | @ WSH | W | 1.0 | 2 | 0 | 0 | 1 | 0 | 12 |
Pirates teammates
- Billy Cook (CF)
- Brandon Eisert (RP)
- Brandon Lowe (2B)
- Braxton Ashcraft (SP)
- Bryan Reynolds (LF)
- Bubba Chandler (SP)
- Carmen Mlodzinski (RP)
- Esmerlyn Valdez (RF)
- Evan Sisk (RP)
- Gregory Soto (RP)
- Henry Davis (C)
- Jacob Gonzalez (SS)
- Jake Mangum (CF)
- Jared Jones (SP)
- Jared Triolo (SS)
- Jhostynxon Garcia (RF)
- Kirby Yates (RP)
- Konnor Griffin (SS)
- Lake Bachar (RP)
- Luke Weaver (RP)
- Mason Montgomery (RP)
- Nick Gonzales (3B)
- Nick Yorke (3B)
- Oneil Cruz (CF)
- Paul Skenes (SP)
- Rafael Flores Jr. (C)
- Ronny Simon (RF)
- Ryan O'Hearn (RF)
- Spencer Horwitz (1B)
- Tyler Callihan (LF)
- Wilber Dotel (RP)
- Yohan Ramirez (RP)
How to read these numbers
- Games are the games Isaac Mattson played.
- Season tables are regular-season games only. The game log includes playoff games, labeled, and reaches into last season when needed.
- A dash (–) means the statistic is not recorded for that game, never zero (hover it for the reason). A column with no recorded value is left out.
This page shows statistics and results only. It contains no sportsbook prices or betting lines. Current markets, hit rates against the line and StatsNext research are in the app.
Research in StatsNext
- Isaac Mattson in StatsNext: Player Research with splits, matchup context and current props
- Pittsburgh Pirates stats and results
- Angels at Pirates, September 5, 2026
- All MLB player stats, 2026