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)

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