| Innings Pitched (IP)/ Years Played | Player | Earned Run Average (ERA) |
| 7356.0 IP (1890-1911) | |
| 6003.1 IP (1875-1892) | |
| 5914.1 IP (1907-1927) | |
| 5190.0 IP (1911-1930) | |
| 5056.1 IP (1890-1906) | |
| 5049.2 IP (1880-1893) | |
| 4956.0 IP (1871-1887) | |
| 4802.0 IP (1880-1892) | |
| | Innings Pitched (IP)/ Years Played | Player | Earned Run Average (ERA) |
| 4782.2 IP (1967-1986) | |
| 4780.2 IP (1900-1916) | |
| 4536.1 IP (1882-1894) | |
| 4535.1 IP (1881-1891) | |
| 4495.2 IP (1901-1917) | |
| 4389.0 IP (1897-1912) | |
| 4275.2 IP (1878-1887) | |
|