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. | Valverde, Jose | (babyave1) | Naples Lakers | 1.9 |
| 2. | Betances, Dellin | (HaloFire) | Staten Island Skulls | 2.0 |
| 3. | Benitez, Armando | (Artinshki) | B Bonds Bombers | 2.1 |
| 4. | Davis, Wade | (rreebe916) | Columbia Lions🇺🇦 | 2.3 |
| 5. | Boxberger, Brad | (dunroche) | Nevada Racin' Rebels | 2.3 |
| 6. | Balfour, Grant | (chaaad) | Yomiuri Giants | 2.3 |
| 7. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 2.4 |
| 8. | Hahn, Jesse | (Erwin23) | Dale Pirates | 2.4 |
| 9. | Papelbon, Jonathan | (nycubsfan) | Huntsville Bearkats | 2.5 |
| 10. | Waddell, Tom | (Majestic44) | Santa cruz Stingers | 2.5 |
| 11. | Nen, Robb | (richgibson) | Pentagon CaNNoN FoDDe R | 2.5 |
| 12. | Guthrie, Mark | (DaveH) | Ladson Cougars | 2.6 |
| 13. | Marmol, Carlos | Skooler Challenge | 2.6 | |
| 14. | Charlton, Norm | (babyave1) | North Bridgton Fins | 2.6 |
| 15. | Street, Huston | (filler) | South Texas Pigmen | 2.7 |
| 16. | Hernandez, David | (baltimorechop) | Hagerstown Suns | 2.7 |
| 17. | Wagner, Billy | (spadez) | Southside Sharks | 2.7 |
| 18. | Britton, Zach | (leeslegends) | East County Devil Dogs | 2.7 |
| 19. | Valverde, Jose | (denniskitts1313) | Badboy Brawlers | 2.7 |
| 20. | Segui, Diego | (theo_smith) | Houghton Miners | 2.7 |
| 21. | Balfour, Grant | (wduncan) | Friday Knight Frogs | 2.7 |
| 22. | Doolittle, Sean | (JohnHeidy) | Rosemount Red Stockings | 2.7 |
| 23. | Kimbrel, Craig | (broles) | South Dakota Cyclones | 2.7 |
| 24. | Chapman, Aroldis | (Wileydog97) | Raleigh Cavemen | 2.7 |
| 25. | Nen, Robb | Casper Ghosts | 2.8 | |
| 26. | Konstanty, Jim | (jeter0296) | Freehold Yankees2 | 2.8 |
| 27. | Zimmerman, Jeff | (bostontex24) | Boston Celtics | 2.8 |
| 28. | Percival, Troy | (Kaline65) | DETROIT TIGERSs | 2.7 |
| 29. | Soriano, Rafael | (nycubsfan) | NYC Cubbies | 2.8 |
| 30. | Cabrera, Genesis | (Trulaia) | York Spartans2 | 2.8 |
| 31. | Nathan, Joe | (nycubsfan) | Spring Bearkats | 2.7 |
| 32. | Soriano, Rafael | (michelb3514) | Iowa Corn Pickers | 2.8 |
| 33. | Percival, Troy | Cobra Kao Strickers | 2.8 | |
| 34. | Lidge, Brad | (rreebe916) | Raleigh Sharks🇺🇦 | 2.8 |
| 35. | Pagan, Emilio | (DEVON311) | SEARCY COPPERHEADS | 2.8 |
| 36. | Percival, Troy | (babyave1) | Skowhegan New Mascots | 2.8 |
| 37. | Hahn, Jesse | (jrobandsteal) | Los Angeles Angelfish | 2.8 |
| 38. | Valverde, Jose | (WorcWarr) | Worcester Warriors | 2.8 |
| 39. | Diaz, Edwin | (richgibson) | Afghan DisasTER | 2.8 |
| 40. | Marmol, Carlos | (richp) | Loan Sharks | 2.8 |
| 41. | Britton, Zach | (paranoid) | Las Vegas Silver Knights | 2.9 |
| 42. | Jackson, Mike | (filler8) | Milwaukee Moo | 2.9 |
| 43. | Lidge, Brad | (sheikyerboudi) | Pabst Keggers | 2.9 |
| 44. | Brewer, Jim | (tbone34) | Louisiana RedZ | 2.9 |
| 45. | Devine, Joey | (skooler1) | New York Highlanders | 2.8 |
| 46. | Boxberger, Brad | (tgbbirch) | Raleigh Raiders | 2.9 |
| 47. | Henke, Tom | (FeartheBeard) | Bedrock Flinstones | 2.9 |
| 48. | Balfour, Grant | (REVEJB) | Pabst Blue Ribbons | 2.9 |
| 49. | Politte, Cliff | (plpl512) | Calgary Bad News Browns | 2.9 |
| 50. | Capps, Carter | (tbone34) | Urinal Cakes | 2.9 |