Ryan Zeferjahn career ERA
4.06Career Regular Season
Ryan Zeferjahn has a career ERA of 4.06 over 3 regular seasons.
- Best season on file: 2.12 in 2024.
- Most recent: 3.97 in 2026.
Average of 3 regular seasons, 2024 through 2026. Figures come from ESPN's box scores and were last read on September 21, 2026.

