Through his first 20 career starts, Parker Messick has a 2.51 ERA, the fifth lowest in franchise history
- 1911 Vean Gregg – 2.04
- 1949 Mike Garcia – 2.36
- 1902-04 Otto Hess – 2.43
- 1909-10 Willie Mitchell – 2.45
- 2025-26 Parker Messick – 2.51
The only others players since 1950 to post an ERA under 3.00 through 20 career starts are Jim Perry and Dennis Eckersley (both 3.58)
Over the last 40 seasons, only two Cleveland rookies have started at least 15 games while posting an ERA under 3.50: