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 | (filler) | Florida Panthers | 33 |
| 2. | White, Doc | (mckarcher) | Black Mesa Xens | 33 |
| 3. | Hernandez, Felix | (hayzess) | Portland Bounty | 31 |
| 4. | Milton, Eric | (Dlil2020) | Erie Fighters | 31 |
| 5. | Chance, Dean | (Searcy) | Oklahoma Barons | 31 |
| 6. | Bunker, Wally | (filler) | Florida Panthers | 31 |
| 7. | Foreman, Frank | Brooklyn Bums | 30 | |
| 8. | Benes, Andy | (nytkrew) | Fort Knox Artillery | 30 |
| 9. | Ryan, Nolan | (coachmcs) | Washington Champions | 30 |
| 10. | Scherzer, Max | (mckarcher) | Black Mesa Xens | 30 |
| 11. | Yarbrough, Ryan | (krallel) | Tottenville Pirates | 30 |
| 12. | Neagle, Denny | (tda81) | The Dangerous Alliance | 30 |
| 13. | Young, Irv | (maxfischer) | Olive Tigers | 29 |
| 14. | Dean, Dizzy | (mckarcher) | Black Mesa Xens | 29 |
| 15. | Milone, Tom | (BadCo1212) | Michigan Macaws | 29 |
| 16. | Kile, Darryl | (denniskitts1313) | Butcher Brawlers | 29 |
| 17. | Kershaw, Clayton | (bigror25) | Gavelston Hail Mary's | 29 |
| 18. | Clemens, Roger | (WorcWarr) | Worcester Warriors | 29 |
| 19. | Waddell, Rube | (PinderonTinder) | Woodenville Waterfowls | 29 |
| 20. | Ward, John | New York Bandits | 29 | |
| 21. | Powell, Jack | (PalinJames) | Fairview Ballbusters | 29 |
| 22. | Morris, Jack | Bartonsville Pumas | 29 | |
| 23. | Marichal, Juan | (ranger) | HOTLANTA HOME BOYS | 29 |
| 24. | Pettitte, Andy | Washington Huskies | 29 | |
| 25. | Valenzuela, Fernando | (ericsk0122) | Hyde Park Maroons | 29 |
| 26. | Young, Chris | (Potholes) | Grover Potholes | 29 |
| 27. | Hernandez, Felix | (Some) | Serenity Now | 29 |
| 28. | Valenzuela, Fernando | (dynasty) | Houston Bolts | 28 |
| 29. | Powell, Jack | (frankieone) | Hollywood T- Birds | 28 |
| 30. | McLain, Denny | (sytsmab) | Husavik Jaja Ding Dongs | 28 |
| 31. | Morris, Ed | (dynasty) | Brentwood Devil Dogs | 28 |
| 32. | Greinke, Zack | (tda81) | D.C. Deep Swamp | 28 |
| 33. | Powell, Jack | 12th Man Why Nots | 28 | |
| 34. | Perez, Melido | (gr33nappleboy) | Edmonton Rhinos | 28 |
| 35. | Lonborg, Jim | (gibblets1973) | La Scie Saw | 28 |
| 36. | Lima, Jose | (athlete4) | Hibbs Highlanders | 28 |
| 37. | Nagy, Charles | (athlete4) | Hibbs Highlanders | 28 |
| 38. | McNally, Dave | (filler) | Baldwin Park QUACKS | 28 |
| 39. | Sale, Chris | (mckarcher) | Black Mesa Xens | 28 |
| 40. | Tudor, John | (ranger) | HOTLANTA HOME BOYS | 28 |
| 41. | Blyleven, Bert | (maxfischer) | East Carolina Hurricanes | 28 |
| 42. | Maddux, Greg | (cunnythumber) | The Desert Red Horses | 28 |
| 43. | Powell, Jack | (filler) | Chicago Logan Squares | 28 |
| 44. | Blyleven, Bert | (filler) | Stillwater Cowboys | 28 |
| 45. | Blyleven, Bert | (Pribby67) | Green Bay Booyah | 28 |
| 46. | Bender, Chief | (mattholland1975) | Norwich Ninjas | 28 |
| 47. | Ford, Whitey | (filler) | San Diego Devil Dawgs | 28 |
| 48. | Scott, Mike | Brooklion Bums | 28 | |
| 49. | Bender, Chief | (Some) | Serenity Now | 28 |
| 50. | Young, Irv | St. Louis Eagles | 28 |