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. | Pascual, Camilo | (dynasty) | Florida Panthers | 33 |
| 2. | Young, Cy | (sheikyerboudi) | Bad News Beers | 33 |
| 3. | White, Doc | (mckarcher) | Black Mesa Xens | 33 |
| 4. | DeSclafani, Anthony | (tda81) | Bison Brawlers | 33 |
| 5. | Cain, Matt | (acr0320) | Lil Rhody Have A Gansett | 32 |
| 6. | Williams, Lefty | (sheikyerboudi) | Bad News Beers | 31 |
| 7. | Bunker, Wally | (dynasty) | Florida Panthers | 31 |
| 8. | Smith, Caleb | (tda81) | Bison Brawlers | 31 |
| 9. | Chance, Dean | (cshaffer) | Olde English 800's | 31 |
| 10. | Sutton, Don | (dynasty) | Saskatchewan Macho Mallards | 30 |
| 11. | Scherzer, Max | (mckarcher) | Black Mesa Xens | 30 |
| 12. | Stieb, Dave | (ikej) | Maine Natives | 30 |
| 13. | Milone, Tom | (alphabravo) | Charlotte Clydesdales | 29 |
| 14. | Valenzuela, Fernando | (harrison_gascho) | liz lemons | 29 |
| 15. | Ward, John | (filler) | Hartford Villans | 29 |
| 16. | Tudor, John | (dynasty) | Canarsie Cannibals | 29 |
| 17. | Morris, Jack | (Thebestcoach) | Darth Revan | 29 |
| 18. | Powell, Jack | (sheikyerboudi) | Pabst Keggers | 29 |
| 19. | Chesbro, Jack | (rainman) | Dark Helmet | 29 |
| 20. | Kershaw, Clayton | (nondh) | Montreal Royale | 29 |
| 21. | Hershiser, Orel | (Pawfouse) | Portland Protest | 29 |
| 22. | Koufax, Sandy | (Caphowdy504) | Louisiana Lummoxes | 29 |
| 23. | McGinnity, Joe | (filler8) | Branson Baboons | 29 |
| 24. | Marichal, Juan | (dcwabdi) | DALLAS ROCKETS | 29 |
| 25. | Dean, Dizzy | (mckarcher) | Black Mesa Xens | 29 |
| 26. | Hunter, Catfish | (Joeholl) | Sacramento Orbit | 29 |
| 27. | McNally, Dave | (batista) | Baldwin Park QUACKS | 28 |
| 28. | Dobson, Pat | (dynasty) | Boston Red Sox | 28 |
| 29. | Higuera, Teddy | (MikeDrop0221) | Delaware County Delco | 28 |
| 30. | Coombs, Jack | (dynasty) | Silver City Spartans | 28 |
| 31. | White, Doc | (cubanlou) | Dixie Harts | 28 |
| 32. | Tudor, John | (dcwabdi) | DALLAS ROCKETS | 28 |
| 33. | Lowe, Derek | (skooler1) | St. Louis Browns | 28 |
| 34. | Harper, Jack | (filler) | Memphis Pharoahs | 28 |
| 35. | Altrock, Nick | (sheikyerboudi) | Feral Groundhogs | 28 |
| 36. | Blyleven, Bert | (dunroche) | East Carolina Hurricanes | 28 |
| 37. | Sale, Chris | (mckarcher) | Black Mesa Xens | 28 |
| 38. | Pfiester, Jack | (cubanlou) | Erie GAMBLERS | 28 |
| 39. | Voth, Austin | (tda81) | Bison Brawlers | 28 |
| 40. | Hunter, Catfish | (filler) | MALIBU SURFERS | 28 |
| 41. | Warneke, Lon | Texas Outlaws | 28 | |
| 42. | Sweeney, Charlie | Texas Reapers | 28 | |
| 43. | Tanana, Frank | (filler) | Kenmare Kestrels | 28 |
| 44. | Powell, Jack | (richgibson) | Detroit ReDs | 28 |
| 45. | Newcombe, Don | (dcwabdi) | Chicago Cougars | 28 |
| 46. | Moyer, Jamie | (acr0320) | Traverse City Beach Bums | 28 |
| 47. | Perez, Pascual | (tjm) | Jersey Shore Devils | 28 |
| 48. | Blyleven, Bert | (filler) | Stillwater Cowboys | 28 |
| 49. | Nehf, Art | (dynasty) | Middle Georgia 20-39 Rowdy Renegades | 27 |
| 50. | Reynolds, Shane | (filler) | Miami Sharks | 27 |