← Pittsburgh Pirates
Isaac Mattson
Pittsburgh Pirates
RP · #72 · Bats R · Throws R · 6'2" · 214 lb · Age 31 · 4 yrs in MLB
2026 grade
34.1
- Runs prevented
- +0.5
- IP · ERA
- 38.2 · 5.35
- K · BB
- 36 · 18
- Rank
- Not qualified
What the grade is made of
Runs each part saves or costs against an average pitcher facing the same batters. Contact counts a quarter for how it turned out, because over a season that's mostly the fielders and luck.
- Home runs allowed3 vs 5 avg+3.3
- Contact allowed (how it turned out counts a quarter)118 vs 114 avg−1.5
- Walks18 vs 15 avg−0.9
- Strikeouts36 vs 39 avg−0.9
- Hit batters1 vs 2 avg+0.4
- Parks pitched in+0.2
2026 game log: pitching
Game grades need 3 batters faced; starts are ranked against starts, relief outings against relief outings.
| Game | Result | Dec | IP | H | R | ER | BB | K | HR | PC | Grade |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sat, Sep 5vsLAA | L 1-6 | 2.0 | 4 | 3 | 3 | 0 | 2 | 0 | 39 | 16.4 | |
| Mon, Aug 17vsDET | L 5-8 | 2.0 | 2 | 1 | 1 | 2 | 1 | 0 | 41 | 30.6 | |
| Tue, Jul 28vsARI | L 7-8 | 1.2 | 3 | 1 | 1 | 1 | 3 | 0 | 39 | 14.2 | |
| Sat, Jul 25vsCHC | L 0-11 | 0.1 | 4 | 3 | 3 | 1 | 1 | 0 | 26 | 1.8 | |
| Sun, Jul 19@CLE | W 7-1 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 13 | 81.8 | |
| Sat, Jul 18@CLE | W 7-1 | 1.0 | 1 | 0 | 0 | 0 | 2 | 0 | 20 | 57.2 | |
| Sun, Jul 12vsMIL | W 14-5 | 0.2 | 1 | 0 | 0 | 1 | 1 | 0 | 18 | 32.4 | |
| Sat, Jul 11vsMIL | W 3-2 | H | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 24 | 58.6 |
| Wed, Jul 8vsATL | L 0-3 | 1.0 | 2 | 1 | 1 | 0 | 1 | 0 | 12 | 27.5 | |
| Sun, Jul 5@WSH | W 11-5 | 1.0 | 2 | 0 | 0 | 0 | 1 | 0 | 12 | 19.4 | |
| Fri, Jul 3@WSH | L 5-9 | 1.1 | 3 | 4 | 4 | 1 | 1 | 2 | 37 | 1.8 | |
| Tue, Jun 30@PHI | L 0-8 | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 9 | 45.9 | |
| Sat, Jun 27vsCIN | L 7-9 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 13 | 84.3 | |
| Fri, Jun 26vsCIN | L 4-6 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 12 | 84.3 | |
| Tue, Jun 23vsSEA | L 2-3 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 13 | 84.3 | |
| Wed, Jun 17@ATH | W 12-4 | 1.0 | 1 | 1 | 1 | 0 | 2 | 1 | 16 | 23.1 | |
| Sun, Jun 14vsMIA | L 2-4 | 1.1 | 0 | 0 | 0 | 2 | 1 | 0 | 27 | 60.9 | |
| Sun, May 17vsPHI | L 0-6 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 15 | 30.0 | |
| Sat, May 16vsPHI | L 0-6 | 1.1 | 0 | 0 | 0 | 1 | 2 | 0 | 25 | 69.9 | |
| Sun, May 10@SF | L 6-7 | B | 0.1 | 3 | 2 | 2 | 0 | 0 | 0 | 18 | 3.7 |
| Thu, May 7@ARI | W 4-2 | H | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | – |
| Thu, Apr 30vsSTL | L 5-10 | 0.2 | 3 | 5 | 5 | 2 | 0 | 0 | 31 | 4.8 | |
| Mon, Apr 27vsSTL | L 2-4 | H | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | – |
| Sat, Apr 25@MIL | W 6-3 | B | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 77.3 |
| Fri, Apr 24@MIL | W 6-0 | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 14 | 62.5 | |
| Sun, Apr 19vsTB | W 6-3 | H | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 8 | 77.9 |
| Sat, Apr 18vsTB | L 7-8 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 77.9 | |
| Thu, Apr 16vsWSH | L 7-8 | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 18 | 65.1 | |
| Tue, Apr 14vsWSH | L 4-5 | 2.0 | 2 | 0 | 0 | 0 | 1 | 0 | 33 | 47.0 | |
| Sat, Apr 11@CHC | W 4-3 | H | 1.0 | 2 | 0 | 0 | 0 | 1 | 0 | 24 | 34.5 |
| Fri, Apr 10@CHC | W 2-0 | H | 1.0 | 0 | 0 | 0 | 1 | 0 | 0 | 12 | 61.9 |
| Tue, Apr 7vsSD | W 7-1 | H | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 9 | 45.5 |
| Mon, Apr 6vsSD | L 0-5 | 1.0 | 2 | 0 | 0 | 0 | 2 | 0 | 21 | 36.1 | |
| Sat, Apr 4vsBAL | W 3-2 | 1.0 | 1 | 0 | 0 | 1 | 1 | 0 | 17 | 32.3 | |
| Wed, Apr 1@CIN | W 8-3 | H | 1.1 | 1 | 0 | 0 | 0 | 0 | 0 | 22 | 68.5 |
| Mon, Mar 30@CIN | L 0-2 | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 15 | 65.3 | |
| Sun, Mar 29@NYM | W 4-3 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 13 | 74.4 | |
| Thu, Mar 26@NYM | L 7-11 | 0.2 | 3 | 2 | 2 | 2 | 1 | 0 | 36 | 6.5 |
Scores, box scores and play-by-play from ESPN. The run values and park factors behind the grades were worked out from Retrosheet's play-by-play: the information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.