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. | Betances, Dellin | (caustixx) | Heritage Pointers | 2.0 |
| 3. | Edwards, Carl | (wulfbaine) | Deep Blue Sharks | 2.3 |
| 4. | Boxberger, Brad | (dunroche) | Nevada Racin' Rebels | 2.3 |
| 5. | Street, Huston | (BUCKLEYRM) | Tuvalu Copras | 2.3 |
| 6. | Hader, Josh | (filler) | Folcroft Fuda's | 2.4 |
| 7. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 2.4 |
| 8. | Hahn, Jesse | (Erwin23) | Dale Pirates | 2.4 |
| 9. | Saucier, Kevin | (Drock242) | Chicago Gangsters | 2.4 |
| 10. | Boxberger, Brad | (sytsmab) | Asbury Park LUMPEN PROLS | 2.4 |
| 11. | Kimbrel, Craig | (super) | Pope Pius Pals | 2.5 |
| 12. | Valverde, Jose | (Honez) | Hogan’s Heroes | 2.5 |
| 13. | Nen, Robb | (filler8) | Mechanicsburg Downtowners | 2.5 |
| 14. | Guthrie, Mark | (DaveH) | Ladson Cougars | 2.6 |
| 15. | Feliz, Neftali | (filler) | Washington Angry Ducks | 2.6 |
| 16. | Charlton, Norm | (babyave1) | North Bridgton Fins | 2.6 |
| 17. | Wagner, Billy | (nycubsfan) | Goshen Gorillas | 2.7 |
| 18. | Street, Huston | (MikeDrop0221) | 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 | (dynasty) | Tisdale Jumping Frogs | 2.7 |
| 26. | Wagner, Billy | (Sidneypointers) | Murdock Miners | 2.7 |
| 27. | Doolittle, Sean | (mmeler) | Delaware Gators | 2.7 |
| 28. | Kimbrel, Craig | (PalinJames) | Erie Feds | 2.7 |
| 29. | Doolittle, Sean | (jamin) | Chester Springs Menjai | 2.7 |
| 30. | Chapman, Aroldis | (Jimfas80) | Clifton Heights Cavemen | 2.7 |
| 31. | Zimmerman, Jeff | (bostontex24) | Boston Celtics | 2.8 |
| 32. | Percival, Troy | (Artinshki) | Base Ball Homers | 2.7 |
| 33. | Feliz, Neftali | (vonveezil) | Kazoo SdS | 2.7 |
| 34. | Hader, Josh | (chaaad) | New York Cubans | 2.7 |
| 35. | Cabrera, Genesis | (dynasty8) | York Spartans2 | 2.8 |
| 36. | Soriano, Rafael | (michelb3514) | Iowa Corn Pickers | 2.8 |
| 37. | Balfour, Grant | (filler8) | Chenango Wolves | 2.8 |
| 38. | Lidge, Brad | (wulfbaine) | Deep Sea Sharks | 2.8 |
| 39. | Pagan, Emilio | Minnesota Moosehead | 2.8 | |
| 40. | Valverde, Jose | (WorcWarr) | Worcester Warriors | 2.8 |
| 41. | Diaz, Edwin | (richgibson) | Afghan DisasTER | 2.8 |
| 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. | Kimbrel, Craig | (BUCKLEYRM) | That 70’s Team | 2.9 |
| 46. | Putz, J.J. | (Whg383) | Texas Bulldogs | 2.9 |
| 47. | Marmol, Carlos | (Mike_bythelake) | Bird in Hand Bakers | 2.9 |
| 48. | Chapman, Aroldis | (CornLiquor) | Jenkinstown Jameson | 2.9 |
| 49. | Miller, Andrew | (jamin) | Chester Springs Menjai | 2.9 |
| 50. | Marmol, Carlos | (ranger) | BELMONT BULLDOGS | 3.0 |