Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (H/9)
Average
OBP
SLG
OPS
At Bats
Runs
Hits
Doubles
Triples
Homers
RBIs
Walks
Strikeouts
Stolen Bases
Caught Stealing
Sac Hits
Sac Fly
HBP
GIDP
D+/-
Wins
Losses
ERA
WHIP
Innings
Hits Allowed
HR Allowed
Walks (P)
Strikeouts (p)
Complete Games
Saves
Blown Saves
Shutouts
Quality Starts
Wild Pitches
Hit Batters
H/9
BB/9
SO/9
| 1. | Feliz, Neftali | (filler) | Washington Angry Ducks | 1.7 |
| 2. | McHugh, Collin | (brian4656) | Appalachian Moonshiners | 2.2 |
| 3. | Edwards, Carl | (filler) | New York Mets | 2.3 |
| 4. | Boxberger, Brad | (dunroche) | Nevada Racin' Rebels | 2.3 |
| 5. | Street, Huston | (rreebe916) | Tuvalu Copras | 2.3 |
| 6. | Hader, Josh | (filler) | Folcroft Fuda's | 2.4 |
| 7. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 2.4 |
| 8. | Saucier, Kevin | (Drock242) | Chicago Gangsters | 2.4 |
| 9. | Boxberger, Brad | (sytsmab) | Asbury Park LUMPEN PROLS | 2.4 |
| 10. | Kimbrel, Craig | (super) | Pope Pius Pals | 2.5 |
| 11. | Valverde, Jose | Hogan’s Heroes | 2.5 | |
| 12. | Hader, Josh | (super) | Fargo Freeze | 2.6 |
| 13. | Guthrie, Mark | (DaveH) | Ladson Cougars | 2.6 |
| 14. | Papelbon, Jonathan | (LDJS1947) | BOSTON ARGYLES | 2.6 |
| 15. | Feliz, Neftali | (filler) | Washington Angry Ducks | 2.6 |
| 16. | Kuo, Hong-Chih | (dunroche) | Nashville Sounds | 2.6 |
| 17. | Wagner, Billy | (nycubsfan) | Goshen Gorillas | 2.7 |
| 18. | Street, Huston | (tgbbirch) | South Texas Pigmen | 2.7 |
| 19. | Hernandez, David | (BaltimoreChop) | Hagerstown Suns | 2.7 |
| 20. | Chapman, Aroldis | (Sugarland) | Chicago Colts | 2.6 |
| 21. | Nen, Robb | (super) | Pope Pius Pals | 2.7 |
| 22. | Percival, Troy | (michelb3514) | Iowa Corn Pickers | 2.6 |
| 23. | Valverde, Jose | (denniskitts1313) | Badboy Brawlers | 2.7 |
| 24. | Segui, Diego | (bigjoe52) | Brooklyn Superbas | 2.7 |
| 25. | Balfour, Grant | (Zigwiggity) | Tisdale Jumping Frogs | 2.7 |
| 26. | Wagner, Billy | (Sidneypointers) | Murdock Miners | 2.7 |
| 27. | Doolittle, Sean | Delaware Gators | 2.7 | |
| 28. | Kimbrel, Craig | (MandieMandie) | Fredricksburg Feds | 2.7 |
| 29. | Doolittle, Sean | (jamin) | Chester Springs Menjai | 2.7 |
| 30. | Chapman, Aroldis | (kingstreet) | Singapore Slingers | 2.7 |
| 31. | Zimmerman, Jeff | (bostontex24) | Boston Celtics | 2.8 |
| 32. | Feliz, Neftali | Kazoo SdS | 2.7 | |
| 33. | Hader, Josh | (chaaad) | New York Cubans | 2.7 |
| 34. | Soriano, Rafael | (michelb3514) | Iowa Corn Pickers | 2.8 |
| 35. | Balfour, Grant | (Ruthbonds) | Chenango Wolves | 2.8 |
| 36. | Lidge, Brad | (Hacksaw86) | Bay Area Bulldogs | 2.8 |
| 37. | Valverde, Jose | San Antonio Missions | 2.8 | |
| 38. | Treinen, Blake | Toledo Mighty Hens | 2.8 | |
| 39. | Kimbrel, Craig | (Gradster10) | Cincinatti Rillas | 2.8 |
| 40. | Diaz, Edwin | (gt049) | St. Louis Venom | 2.8 |
| 41. | Kimbrel, Craig | (LDJS1947) | PHILADELPHIA EAGLES | 2.9 |
| 42. | Devine, Joey | (skooler1) | New York Highlanders | 2.8 |
| 43. | Boxberger, Brad | (54pete54) | Niagara IceDogs | 2.9 |
| 44. | Henke, Tom | (FeartheBeard) | Bedrock Flinstones | 2.9 |
| 45. | Chapman, Aroldis | (Artinshki) | Portland Bounty | 2.9 |
| 46. | Percival, Troy | (broles) | Durham Bullwinkles | 2.9 |
| 47. | Adams, Mike | (andyyoung) | Homestead Grays | 2.9 |
| 48. | Kimbrel, Craig | Boston Sox | 2.9 | |
| 49. | Putz, J.J. | (Ereid) | Texas Bulldogs | 2.9 |
| 50. | Chapman, Aroldis | (GaK54aGaM) | Dartmouth BaseDogs | 2.9 |