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| All-Time Pitching Leaders | |||
| Single Season Earned Run Average Leaders | |||
| Rank | Player | ERA | Season |
| 1. | Dutch Leonard | 1.00 | 1914 |
| 2. | Bob Gibson | 1.12 | 1968 |
| 3. | Walter Johnson | 1.14 | 1913 |
| 4. | Grover Alexander | 1.22 | 1915 |
| 5. | Walter Johnson | 1.27 | 1918 |
| 6. | Fred Anderson | 1.45 | 1917 |
| 7. | Walter Johnson | 1.48 | 1919 |
| 8. | Smokey Joe Wood | 1.49 | 1915 |
| 9. | Dwight Gooden | 1.53 | 1985 |
| 10. | Eddie Cicotte | 1.54 | 1917 |
| 11. | Grover Alexander | 1.55 | 1916 |
| Walter Johnson | 1.55 | 1915 | |
| 13. | Greg Maddux | 1.56 | 1994 |
| 14. | Fred Toney | 1.57 | 1915 |
| 15. | Rube Marquard | 1.58 | 1916 |
| Active players shown in CAPS | Last Updated: Fri May 25 08:15:05 EDT 2012 | |||
