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. | Pascual, Camilo | (filler) | Florida Panthers | 33 |
| 3. | Hernandez, Felix | (Jericho2u) | Honolulu Happy Toyz | 31 |
| 4. | Chance, Dean | Sun City Sansabelts | 31 | |
| 5. | Milton, Eric | (Dlil2020) | Erie Fighters | 31 |
| 6. | Bunker, Wally | (filler) | Florida Panthers | 31 |
| 7. | Benes, Andy | (nytkrew) | Fort Knox Artillery | 30 |
| 8. | Scherzer, Max | (mckarcher) | Black Mesa Xens | 30 |
| 9. | Yarbrough, Ryan | Tottenville Pirates | 30 | |
| 10. | Foreman, Frank | Brooklyn Bums | 30 | |
| 11. | Ryan, Nolan | (coachmcs) | Washington Champions | 30 |
| 12. | Young, Irv | (leprechaunjm) | Gettysburg Cavalry | 29 |
| 13. | Koufax, Sandy | Chicago Mighty Bulls | 29 | |
| 14. | Kile, Darryl | (chaaad) | Manhattan Jaspers | 29 |
| 15. | Hernandez, Felix | (filler) | Serenity Now | 29 |
| 16. | Valenzuela, Fernando | (ericsk0122) | Hyde Park Maroons | 29 |
| 17. | Marichal, Juan | (vonveezil) | HOTLANTA HOME BOYS | 29 |
| 18. | Milone, Tom | (godelfan) | Des Moines Demons | 29 |
| 19. | Dean, Dizzy | (mckarcher) | Black Mesa Xens | 29 |
| 20. | Clemens, Roger | (WorcWarr) | Worcester Warriors | 29 |
| 21. | Waddell, Rube | (PinderonTinder) | Woodenville Waterfowls | 29 |
| 22. | Kershaw, Clayton | (JoeyT2870) | Gavelston Hail Mary's | 29 |
| 23. | Ward, John | (Silas) | Hartford Villans | 29 |
| 24. | Powell, Jack | Erie Ballbusters | 29 | |
| 25. | Morris, Jack | (OldBobcat) | SOUTH BEND HELLCATS | 29 |
| 26. | Powell, Jack | Chicago Logan Squares | 28 | |
| 27. | Blyleven, Bert | (dunroche) | East Carolina Hurricanes | 28 |
| 28. | Greinke, Zack | (deyanksfan) | D.C. Deep Swamp | 28 |
| 29. | Bender, Chief | (mattholland1975) | Norwich Ninjas | 28 |
| 30. | Bender, Chief | (filler) | Serenity Now | 28 |
| 31. | Scott, Mike | (CG4177) | Jeremiah Bullfrogs | 28 |
| 32. | Tudor, John | (vonveezil) | HOTLANTA HOME BOYS | 28 |
| 33. | McLain, Denny | Peoria Free Swingers | 28 | |
| 34. | Valenzuela, Fernando | Houston Bolts | 28 | |
| 35. | McNally, Dave | (filler) | Baldwin Park QUACKS | 28 |
| 36. | Blyleven, Bert | (Pribby67) | Montana Mustangs | 28 |
| 37. | Warneke, Lon | (Nuroc) | Equestrian Park Ritualists | 28 |
| 38. | Powell, Jack | (filler) | 12th Man Why Nots | 28 |
| 39. | Young, Irv | (filler) | ST. LOUIS EAGLES | 28 |
| 40. | Blyleven, Bert | Stillwater Cowboys | 28 | |
| 41. | Lima, Jose | Ladson Cougars | 28 | |
| 42. | Nagy, Charles | Ladson Cougars | 28 | |
| 43. | Powell, Jack | (davrogbro62) | Philly Phish | 28 |
| 44. | Sale, Chris | (mckarcher) | Black Mesa Xens | 28 |
| 45. | Kirby, Clay | (filler) | Alabama Aces | 28 |
| 46. | Maddux, Greg | (cunnythumber) | Peoria Red Ronaldos | 28 |
| 47. | Altrock, Nick | Freehold Patriots | 28 | |
| 48. | Ford, Whitey | (filler) | San Diego Devil Dawgs | 28 |
| 49. | Blyleven, Bert | (markphip) | Colorado Mustangs | 27 |
| 50. | Young, Irv | (chaaad) | Manhattan Jaspers | 27 |