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. | White, Doc | (mckarcher) | Black Mesa Xens | 33 |
| 2. | Young, Cy | (filler) | Los Angeles Bums | 33 |
| 3. | Pascual, Camilo | (dynasty) | Florida Panthers | 33 |
| 4. | DeSclafani, Anthony | (dbacksstar) | BB Bison | 33 |
| 5. | Cain, Matt | (hanson) | Lil Rhody Have A Gansett | 32 |
| 6. | Chance, Dean | (filler8) | Olde English 800's | 31 |
| 7. | Milton, Eric | (whitehats) | Erie Fighters | 31 |
| 8. | Bunker, Wally | (dynasty) | Florida Panthers | 31 |
| 9. | Williams, Lefty | (filler) | Los Angeles Bums | 31 |
| 10. | Smith, Caleb | (dbacksstar) | BB Bison | 31 |
| 11. | Yarbrough, Ryan | (filler2) | Tottenville Pirates | 30 |
| 12. | Ryan, Nolan | (coachmcs) | Washington Champions | 30 |
| 13. | Scherzer, Max | (mckarcher) | Black Mesa Xens | 30 |
| 14. | Stieb, Dave | (ikej) | Maine Natives | 30 |
| 15. | Benes, Andy | (plpl512) | Montreal Monarchs | 30 |
| 16. | Powell, Jack | (sheikyerboudi) | Pabst Keggers | 29 |
| 17. | Dean, Dizzy | (mckarcher) | Black Mesa Xens | 29 |
| 18. | Morris, Jack | SOUTH BEND HELLCATS | 29 | |
| 19. | Hernandez, Felix | (filler) | Serenity Now | 29 |
| 20. | Milone, Tom | (Hendu42) | Des Moines Demons | 29 |
| 21. | Marichal, Juan | (LDJS1947) | DALLAS ROCKETS | 29 |
| 22. | Young, Irv | (leprechaunjm) | Gettysburg Cavalry | 29 |
| 23. | Valenzuela, Fernando | Hyde Park Maroons | 29 | |
| 24. | Tudor, John | (dynasty) | Canarsie Cannibals | 29 |
| 25. | Kile, Darryl | (chaaad) | Manhattan Jaspers | 29 |
| 26. | Koufax, Sandy | (MLBGenius) | Janesville shocKers | 29 |
| 27. | Waddell, Rube | (filler8) | Woodenville Waterfowls | 29 |
| 28. | Ward, John | (filler) | Hartford Villans | 29 |
| 29. | Hunter, Catfish | Kansas City Packers | 29 | |
| 30. | Kershaw, Clayton | (steveh28) | Gavelston Hail Mary's | 29 |
| 31. | Powell, Jack | (filler) | 12th Man Why Nots | 28 |
| 32. | McNally, Dave | (batista) | Baldwin Park QUACKS | 28 |
| 33. | Blyleven, Bert | (dunroche) | East Carolina Hurricanes | 28 |
| 34. | Bender, Chief | (filler) | Serenity Now | 28 |
| 35. | Lima, Jose | (Theo_smith) | Columbus Bees 90's | 28 |
| 36. | Nagy, Charles | (Theo_smith) | Columbus Bees 90's | 28 |
| 37. | McLain, Denny | Peoria Free Swingers | 28 | |
| 38. | Dobson, Pat | (filler) | Boston Red Sox | 28 |
| 39. | Ford, Whitey | (billyconn) | San Diego Sharks | 28 |
| 40. | Perez, Pascual | (tjm) | Jersey Shore Devils | 28 |
| 41. | Higuera, Teddy | (MikeDrop0221) | Branch County Mighty Ducks | 28 |
| 42. | Voth, Austin | (dbacksstar) | BB Bison | 28 |
| 43. | Valenzuela, Fernando | (dynasty) | Houston Bolts | 28 |
| 44. | Kirby, Clay | (filler8) | Alabama Aces | 28 |
| 45. | Maddux, Greg | (cunnythumber) | Peoria Red Ronaldos | 28 |
| 46. | Harper, Jack | (filler) | Memphis Pharoahs | 28 |
| 47. | Altrock, Nick | (sheikyerboudi) | Feral Groundhogs | 28 |
| 48. | Tudor, John | (LDJS1947) | DALLAS ROCKETS | 28 |
| 49. | Carlton, Steve | (player839) | PHI PHI | 28 |
| 50. | Powell, Jack | (dynasty) | Chicago Logan Squares | 28 |