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. | Betances, Dellin | (HaloFire) | Heritage Pointers | 2.0 |
| 2. | Boxberger, Brad | (dunroche) | Nevada Racin' Rebels | 2.3 |
| 3. | Street, Huston | (Gaberino) | Tuvalu Copras | 2.3 |
| 4. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 2.4 |
| 5. | Hahn, Jesse | (Erwin23) | Dale Pirates | 2.4 |
| 6. | Boxberger, Brad | (sytsmab) | Asbury Park LUMPEN PROLS | 2.4 |
| 7. | Kimbrel, Craig | (super) | Pope Pius Pals | 2.5 |
| 8. | Papelbon, Jonathan | (nycubsfan) | Huntsville Bearkats | 2.5 |
| 9. | Nen, Robb | (richgibson) | Blair Mountain ReBeLS | 2.5 |
| 10. | Guthrie, Mark | (DaveH) | Ladson Cougars | 2.6 |
| 11. | Feliz, Neftali | (Gaberino) | Washington Uncle Joes | 2.6 |
| 12. | Charlton, Norm | (babyave1) | North Bridgton Fins | 2.6 |
| 13. | Wagner, Billy | (nycubsfan) | Goshen Gorillas | 2.7 |
| 14. | Street, Huston | (honez) | South Texas Pigmen | 2.7 |
| 15. | Hernandez, David | (BaltimoreChop) | Hagerstown Suns | 2.7 |
| 16. | Percival, Troy | (michelb3514) | Iowa Corn Pickers | 2.6 |
| 17. | Britton, Zach | (leeslegends) | East County Devil Dogs | 2.7 |
| 18. | Valverde, Jose | (denniskitts1313) | Badboy Brawlers | 2.7 |
| 19. | Segui, Diego | (Theo_smith) | Houghton Miners | 2.7 |
| 20. | Balfour, Grant | (acr0320) | Tisdale Jumping Frogs | 2.7 |
| 21. | Wagner, Billy | (Sidneypointers) | Murdock Miners | 2.7 |
| 22. | Doolittle, Sean | (vonveezil) | Delaware Gators | 2.7 |
| 23. | Kimbrel, Craig | (shane211) | South Dakota Cyclones | 2.7 |
| 24. | Kimbrel, Craig | (richgibson) | Lowndes County ScHooLeRs | 2.7 |
| 25. | Doolittle, Sean | (jamin) | Chester Springs Menjai | 2.7 |
| 26. | Chapman, Aroldis | (Jimfas80) | Clifton Heights Cavemen | 2.7 |
| 27. | Konstanty, Jim | (jeter0296) | Freehold Yankees2 | 2.8 |
| 28. | Zimmerman, Jeff | (bostontex24) | Boston Celtics | 2.8 |
| 29. | Percival, Troy | (JohnHeidy) | Minneapolis Mafia | 2.7 |
| 30. | Cabrera, Genesis | (Trulaia) | York Spartans2 | 2.8 |
| 31. | Soriano, Rafael | (michelb3514) | Iowa Corn Pickers | 2.8 |
| 32. | Balfour, Grant | (filler) | Chenango Wolves | 2.8 |
| 33. | Lidge, Brad | (rreebe916) | Raleigh Sharks | 2.8 |
| 34. | Pagan, Emilio | (filler8) | Minnesota Moosehead | 2.8 |
| 35. | Hahn, Jesse | (Triatribe) | Los Angeles Angelfish | 2.8 |
| 36. | Valverde, Jose | (WorcWarr) | Worcester Warriors | 2.8 |
| 37. | Diaz, Edwin | (dcwabdi) | Afghan DisasTER | 2.8 |
| 38. | Marmol, Carlos | (wileydog97) | Raleigh Sharks | 2.8 |
| 39. | Jackson, Mike | (dynasty) | Milwaukee Moo | 2.9 |
| 40. | Devine, Joey | (skooler1) | New York Highlanders | 2.8 |
| 41. | Boxberger, Brad | (Wileydog97) | Raleigh Bull Dogs | 2.9 |
| 42. | Henke, Tom | (FeartheBeard) | Bedrock Flinstones | 2.9 |
| 43. | Politte, Cliff | (plpl512) | Calgary Bad News Browns | 2.9 |
| 44. | Kimbrel, Craig | (sgt714) | Boston Red Sox | 2.9 |
| 45. | Marmol, Carlos | (filler8) | Bird in Hand Bakers | 2.9 |
| 46. | Clippard, Tyler | (Zeedood) | Rittenhouse Defenders | 2.9 |
| 47. | Chapman, Aroldis | (CornLiquor) | Jenkinstown Jameson | 2.9 |
| 48. | Chapman, Aroldis | (nycubsfan) | JACKSON HEIGHTS SHARKS | 2.9 |
| 49. | Miller, Andrew | (jamin) | Chester Springs Menjai | 2.9 |
| 50. | Kuo, Hong-Chih | (paranoid) | Las Vegas Screamin Eagles | 2.9 |