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 | (cshaffer) | Florida Panthers | 33 |
| 2. | White, Doc | (mckarcher) | Black Mesa Xens | 33 |
| 3. | Harvey, Matt | NYM NYM | 32 | |
| 4. | Hernandez, Felix | (hayzess) | Portland Bounty | 31 |
| 5. | Milton, Eric | Erie Fighters | 31 | |
| 6. | Chance, Dean | (Searcy) | Oklahoma Barons | 31 |
| 7. | Bunker, Wally | (cshaffer) | Florida Panthers | 31 |
| 8. | Foreman, Frank | Carol City Currys | 30 | |
| 9. | Scherzer, Max | (mckarcher) | Black Mesa Xens | 30 |
| 10. | Gooden, Dwight | NYM NYM | 30 | |
| 11. | Ryan, Nolan | Washington Champions | 30 | |
| 12. | Neagle, Denny | (tda81) | The Dangerous Alliance | 30 |
| 13. | Benes, Andy | (tbsmit) | San Bernardino Livewires | 30 |
| 14. | Yarbrough, Ryan | (filler) | Tottenville Pirates | 30 |
| 15. | Dean, Dizzy | (mckarcher) | Black Mesa Xens | 29 |
| 16. | Kershaw, Clayton | (Bevofan2020) | Corpus Christi Stevedors | 29 |
| 17. | Morris, Jack | (filler) | Bartonsville Pumas | 29 |
| 18. | Clemens, Roger | (WorcWarr) | Worcester Warriors | 29 |
| 19. | Powell, Jack | (coachmcs) | Fairview Ballbusters | 29 |
| 20. | Pettitte, Andy | (ressien) | Washington Huskies | 29 |
| 21. | Kile, Darryl | (Sumo6901) | FLORIDA LOBSTERS | 29 |
| 22. | Milone, Tom | (habsco) | Mudville Demons | 29 |
| 23. | Marichal, Juan | (ranger) | HOTLANTA HOME BOYS | 29 |
| 24. | Waddell, Rube | (PinderonTinder) | Woodenville Waterfowls | 29 |
| 25. | Valenzuela, Fernando | (ericsk0122) | Hyde Park Maroons | 29 |
| 26. | Hernandez, Felix | (joshbonds25) | Serenity Now | 29 |
| 27. | Ward, John | New York Bandits | 29 | |
| 28. | Young, Chris | (Potholes) | Grover Potholes | 29 |
| 29. | Young, Irv | Dixie Tigers | 29 | |
| 30. | Blyleven, Bert | Castle Rock Rockets | 28 | |
| 31. | Young, Irv | (filler) | St. Louis Eagles | 28 |
| 32. | Blyleven, Bert | (Pribby67) | Green Bay Booyah | 28 |
| 33. | Scott, Mike | Brooklion Bums | 28 | |
| 34. | Lima, Jose | (shelley71) | New York Highlanders | 28 |
| 35. | Nagy, Charles | (shelley71) | New York Highlanders | 28 |
| 36. | Powell, Jack | (sammy-z) | Candy Land Peppermints | 28 |
| 37. | Greinke, Zack | (coachmcs) | D.C. Deep Swamp | 28 |
| 38. | Valenzuela, Fernando | (Majestic44) | Houston Bolts | 28 |
| 39. | McNally, Dave | (richgibson) | Baldwin Park QUACKS | 28 |
| 40. | Darling, Ron | NYM NYM | 28 | |
| 41. | Bender, Chief | (mattholland1975) | Norwich Ninjas | 28 |
| 42. | Bender, Chief | (joshbonds25) | Serenity Now | 28 |
| 43. | Kirby, Clay | Alabama Aces | 28 | |
| 44. | Powell, Jack | (frankieone) | Hollywood T- Birds | 28 |
| 45. | Perez, Melido | Edmonton Rhinos | 28 | |
| 46. | Blyleven, Bert | Stillwater Cowboys | 28 | |
| 47. | Sale, Chris | (mckarcher) | Black Mesa Xens | 28 |
| 48. | Lonborg, Jim | (gibblets1973) | La Scie Saw | 28 |
| 49. | Morris, Ed | (LeesLegends) | Brentwood Devil Dogs | 28 |
| 50. | Tudor, John | (ranger) | HOTLANTA HOME BOYS | 28 |