Isaac
Mattson
PAge : 31Throws : R
#72
Isaac Mattson
Height : 6' 2" · Weight : 97 kg · Bats : R · Throws : R · MLB debut : 2021-05-07
Born in : Erie, PA, USA
MLB record
| Year | Team | PJ | V | D | MPM | MJ | RB | WHIP |
|---|---|---|---|---|---|---|---|---|
| 2026 | Pittsburgh Pirates | 38 | 0 | 0 | 5.35 | 38.2 | 36 | 1.60 |
| 2025 | Pittsburgh Pirates | 44 | 3 | 3 | 2.45 | 47.2 | 45 | 1.13 |
| 2024 | Pittsburgh Pirates | 3 | 0 | 0 | 5.06 | 5.1 | 6 | 1.13 |
| 2021 | Baltimore Orioles | 4 | 0 | 0 | 6.23 | 4.1 | 3 | 2.31 |
| Career totals | 89 | 3 | 3 | 3.94 | 96.0 | 90 | 1.38 | |
Advanced stats, 2026Relief pitcherMLB stats →
ERA
5.35
FIP
3.72
xFIP
4.74
ERA-
124
WHIP
1.60
K%
20.5 %
BB%
10.2 %
Strikeouts
36
Innings
38.7
Wins
0
Stats: MLB (statsapi) and Baseball Savant.
2027 projectionMLB trends →
Projected WAR
0.4
Strikeouts
39
2026 WAR
0.3
This season's pace, over the average of the last two workloads, adjusted for next year's age.
Trend
→ Stable (-2)
- 20250.7 WAR · 1.0 per full season
- 20260.3 WAR · 0.5 per full season
Outlook, age included
-2 · 30 y.o. · prime years
It is only a projection. It knows nothing about injuries, trades or role changes.
Player ratings, 2026All ratings →
Ratings from 0 to 100, computed from Statcast and MLB stats over four seasons, never by hand. 75 = established regular, 87 = 90th percentile, 95+ = elite.
OV · Overall
59
Replacement or prospect
- VEL
- Velocity
- 71
- STF
- Stuff
- 68
- CTL
- Control
- 71
- CNT
- Contact allowed
- 52
- STA
- Stamina
- —
- DUR
- Durability
- 69
- EX
- Experience
- 66
Why these ratings?Hide details
- VEL — Velocity : Fastball velocity
- STF — Stuff : Strikeouts, K − BB
- CTL — Control : Walks avoided
- CNT — Contact allowed : xwOBA, barrels and hard-hit balls allowed
- STA — Stamina : Innings per start and innings pitched
- DUR — Durability : Games played over several seasons
- EX — Experience : Seasons in the majors
WAR and PAL Rating, 2026How we rate →
WAR is fWAR (FanGraphs' version, distributed through MLB's API): wins added above a replacement player. PAL Rating scores performance from 0 to 100 against regulars in the same role (50 = median).
PAL: dimensions
A pitcher's WAR
Computed by MLB from FIP (strikeouts, walks, home runs). FIP: 3.72 · RA9-WAR: -0.2
StatcastStatcast leaderboards →
MLB's tracking of every ball, 2026 season. The percentile ranks the player among regulars in the role: 90th means better than 90% of them.
Fastball
94.2 mi/h
38th percentile
K%
20.5 %
29th percentile
BB%
10.2 %
39th percentile
xERA
6.23
2th percentile
xwOBA allowed
.374
2th percentile
Barrels allowed
12.4 %
3th percentile
| Season | Team | WAR | PAL | OV | Fastball | K% | BB% | xERA | xwOBA allowed |
|---|---|---|---|---|---|---|---|---|---|
| 2026 | PIT | 0.3 | 9 | 59 | 94.2 | 20.5 | 10.2 | 6.23 | .374 |
| 2025 | PIT | 0.7 | 54 | 74 | 93.9 | 22.7 | 9.6 | 3.28 | .283 |
Game log, 2026
| Date | Opponent | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Sep 5 | vs LAA | 2.0 | 4 | 3 | 0 | 2 | 5.35 |
| Aug 17 | vs DET | 2.0 | 2 | 1 | 2 | 1 | 4.91 |
| Jul 28 | vs AZ | 1.2 | 3 | 1 | 1 | 3 | 4.93 |
| Jul 25 | vs CHC | 0.1 | 4 | 3 | 1 | 1 | 4.91 |
| Jul 19 | @ CLE | 1.0 | 0 | 0 | 0 | 1 | 4.13 |
| Jul 18 | @ CLE | 1.0 | 1 | 0 | 0 | 2 | 4.26 |
| Jul 12 | vs MIL | 0.2 | 1 | 0 | 1 | 1 | 4.40 |
| Jul 11 | vs MIL | 1.0 | 1 | 0 | 0 | 0 | 4.50 |
| Jul 8 | vs ATL | 1.0 | 2 | 1 | 0 | 1 | 4.66 |
| Jul 5 | @ WSH | 1.0 | 2 | 0 | 0 | 1 | 4.50 |