Isaac Mattson career WHIP
1.38Career Regular Season
Isaac Mattson has a career WHIP of 1.38 over 4 regular seasons.
- Best season on file: 1.13 in 2024.
- Most recent: 1.60 in 2026.
Average of 4 regular seasons, 2021 through 2026. Figures come from ESPN's box scores and were last read on September 22, 2026.
| GP: Games the player appeared in, however briefly. | W: Games in which this pitcher was credited with the win. | L: Games in which this pitcher was charged with the loss. | ERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent. | IP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs. | K: Batters this pitcher struck out. | BB: Times the batter reached first base on four balls. | WHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite. | SV: Games finished by protecting a narrow lead to the last out. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2021 |  BAL | 4 | 0 | 0 | 6.23 | 4.1 | 3 | 5 | 2.31 | 0 |
| 2024 |  PIT | 3 | 0 | 0 | 5.06 | 5.1 | 6 | 5 | 1.13 | 0 |
| 2025 | PIT | 44 | 3 | 3 | 2.45 | 47.2 | 45 | 19 | 1.13 | 0 |
| 2026 | PIT | 38 | 0 | 0 | 5.35 | 38.2 | 36 | 18 | 1.60 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV