Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Losses)
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. | DeSclafani, Anthony | (tda81) | Bison Brawlers | 33 |
| 2. | Young, Cy | (sheikyerboudi) | Bad News Beers | 33 |
| 3. | Pascual, Camilo | (filler2) | Florida Panthers | 33 |
| 4. | White, Doc | (thadjhall) | Manhattan Darts 32 | 33 |
| 5. | Cain, Matt | (34Payton) | Libertyville Cubs | 32 |
| 6. | Chance, Dean | (cshaffer) | Olde English 800's | 31 |
| 7. | Williams, Lefty | (sheikyerboudi) | Bad News Beers | 31 |
| 8. | Bunker, Wally | (filler2) | Florida Panthers | 31 |
| 9. | Smith, Caleb | (tda81) | Bison Brawlers | 31 |
| 10. | Scherzer, Max | (thadjhall) | Manhattan Darts 32 | 30 |
| 11. | Stieb, Dave | (ikej) | Maine Natives | 30 |
| 12. | Sutton, Don | (dynasty) | Saskatchewan Macho Mallards | 30 |
| 13. | McLain, Denny | (dunroche) | Chenango Wolves | 30 |
| 14. | Koufax, Sandy | (dunroche) | Chenango Wolves | 29 |
| 15. | Hershiser, Orel | (Pawfouse) | Portland Protest | 29 |
| 16. | Kershaw, Clayton | (nondh) | Montreal Royale | 29 |
| 17. | Marichal, Juan | (dcwabdi) | DALLAS ROCKETS | 29 |
| 18. | Hunter, Catfish | (Joeholl) | Sacramento Orbit | 29 |
| 19. | Dean, Dizzy | (thadjhall) | Manhattan Darts 32 | 29 |
| 20. | McGinnity, Joe | (benwoodard1) | ToiletBowl PoopyHeads | 29 |
| 21. | Milone, Tom | (alphabravo) | Charlotte Clydesdales | 29 |
| 22. | Koufax, Sandy | (Caphowdy504) | Louisiana Lummoxes | 29 |
| 23. | Ward, John | (filler) | Hartford Villans | 29 |
| 24. | Tudor, John | (dynasty) | Canarsie Cannibals | 29 |
| 25. | Chesbro, Jack | (rainman) | Dark Helmet | 29 |
| 26. | Powell, Jack | (richgibson) | Detroit ReDs | 28 |
| 27. | Voth, Austin | (tda81) | Bison Brawlers | 28 |
| 28. | Tanana, Frank | (filler) | Kenmare Kestrels | 28 |
| 29. | Pfiester, Jack | Erie GAMBLERS | 28 | |
| 30. | Perez, Pascual | (tjm) | Jersey Shore Devils | 28 |
| 31. | Higuera, Teddy | (MikeDrop0221) | Delaware County Delco | 28 |
| 32. | White, Doc | (filler) | Chicago Logan Squares | 28 |
| 33. | Dobson, Pat | (filler8) | Boston Red Sox | 28 |
| 34. | Coombs, Jack | (dynasty) | Silver City Spartans | 28 |
| 35. | White, Doc | (cubanlou) | Dixie Harts | 28 |
| 36. | Newcombe, Don | (dcwabdi) | Chicago Cougars | 28 |
| 37. | Harper, Jack | (filler) | Memphis Pharoahs | 28 |
| 38. | Altrock, Nick | (sheikyerboudi) | Feral Groundhogs | 28 |
| 39. | Tudor, John | (dcwabdi) | DALLAS ROCKETS | 28 |
| 40. | Blyleven, Bert | (filler) | Stillwater Cowboys | 28 |
| 41. | Warneke, Lon | (sheikyerboudi) | Mojave Desert Aces Eights | 28 |
| 42. | Sale, Chris | (thadjhall) | Manhattan Darts 32 | 28 |
| 43. | Moyer, Jamie | (acr0320) | Traverse City Beach Bums | 28 |
| 44. | Sweeney, Charlie | (Bravesman) | Texas Reapers | 28 |
| 45. | Hunter, Catfish | (filler) | MALIBU SURFERS | 28 |
| 46. | McNally, Dave | (batista) | Baldwin Park QUACKS | 28 |
| 47. | Lowe, Derek | (skooler1) | St. Louis Browns | 28 |
| 48. | Kershaw, Clayton | (richgibson) | SNCC SiTDoWneRS | 27 |
| 49. | Maddux, Greg | (REVEJB) | Vida Blues | 27 |
| 50. | Tudor, John | (filler) | Schitt’s Creek Schitts | 27 |