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| All-Time Pitching Leaders | |||
| Single Season Losses Leaders | |||
| Rank | Player | L | Season |
| 1. | John Coleman | 48 | 1883 |
| 2. | Will White | 42 | 1880 |
| 3. | Larry McKeon | 41 | 1884 |
| 4. | Jim McCormick | 40 | 1879 |
| Grin Bradley | 40 | 1879 | |
| 6. | George Cobb | 37 | 1892 |
| Kid Carsey | 37 | 1891 | |
| Henry Porter | 37 | 1888 | |
| 9. | Stump Weidman | 36 | 1886 |
| 10. | Hardie Henderson | 35 | 1885 |
| Adonis Terry | 35 | 1884 | |
| Fleury Sullivan | 35 | 1884 | |
| Jim Devlin | 35 | 1876 | |
| 14. | Bill Hutchinson | 34 | 1892 |
| Mark Baldwin | 34 | 1889 | |
| Al Mays | 34 | 1887 | |
| Matt Kilroy | 34 | 1886 | |
| Bob Barr | 34 | 1884 | |
| Pud Galvin | 34 | 1880 | |
| Bobby Mathews | 34 | 1876 | |
| Active players shown in CAPS | Last Updated: Fri May 25 08:15:05 EDT 2012 | |||
