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. | Joss, Addie | (sheus37393) | Cancun Chaos | 30 |
| 2. | McLain, Denny | (jaredhamann) | Kentucky Horses | 30 |
| 3. | Koufax, Sandy | (jaredhamann) | Kentucky Horses | 29 |
| 4. | Plesac, Zach | (dynasty) | Portland Vikings | 29 |
| 5. | Hamels, Cole | (Rocketman66) | Colorado Bears | 29 |
| 6. | Sutton, Don | (walle-1) | Louisiana Gators | 29 |
| 7. | Tesreau, Jeff | (dynasty) | Seattle Sloths | 29 |
| 8. | Sabathia, CC | Iowa Pigs | 29 | |
| 9. | Andujar, Joaquin | (walle-1) | Charlotte Spiders | 29 |
| 10. | Drysdale, Don | (filler) | Atlanta Gorillas | 29 |
| 11. | McGinnity, Joe | (filler) | Toronto Tigers | 29 |
| 12. | Blyleven, Bert | (Rainman) | Salem Demons | 28 |
| 13. | Reulbach, Ed | (sheikyerboudi) | Schlitz Brewmeisters | 28 |
| 14. | Sweeney, Charlie | (dynasty) | Portland Vikings | 28 |
| 15. | Wood, Joe | (walle-1) | Kansas Grasshoppers | 28 |
| 16. | Pfiester, Jack | (sethb33) | Brooklyn Bridegrooms | 28 |
| 17. | White, Doc | (rlapierre) | DEATH VALLEY REAPERS | 28 |
| 18. | Cicotte, Eddie | (walle-1) | Charlotte Spiders | 28 |
| 19. | Newcombe, Don | (walle-1) | Louisiana Gators | 28 |
| 20. | Krukow, Mike | (dynasty) | New Jersey Devils | 28 |
| 21. | Bender, Chief | (richp) | Beantown Bombers | 28 |
| 22. | Ford, Whitey | (todorojo) | Spanish Fork Toros | 28 |
| 23. | White, Doc | (walle-1) | Kentucky Horses | 28 |
| 24. | McGinnity, Joe | (dynasty) | Arizona Suns | 28 |
| 25. | Viola, Frank | (walle-1) | Utah Nightmares | 28 |
| 26. | Shields, James | (finalbody) | Kansas Grasshoppers | 28 |
| 27. | Swindell, Greg | (AnglesMVP27) | Uncanny X-Men | 28 |
| 28. | Taylor, Jack | (WorcWarr) | Worcester Warriors | 28 |
| 29. | Halladay, Roy | (godelfan) | Beaverdale Borg | 28 |
| 30. | Joss, Addie | (JohnHeidy) | Highland Hi-Ballers | 28 |
| 31. | Vander Meer, Johnny | (walle-1) | Pittsburgh Plunder | 28 |
| 32. | Lyons, Ted | (walle-1) | Milwaukee Skeletons | 28 |
| 33. | Cicotte, Eddie | (cubsarethebest) | South Bend Cubs | 28 |
| 34. | Chance, Dean | (CoachHollett) | Boston Bees | 28 |
| 35. | Saberhagen, Bret | (filler8) | Chicago Reapers | 28 |
| 36. | Tanana, Frank | (dynasty) | Sacramento Lions | 28 |
| 37. | Sutton, Don | (Ask12Be1) | Beach City Breaker’s | 28 |
| 38. | McLain, Denny | (athlete4) | NASHVILLE NIGHT RIDERS | 28 |
| 39. | Hendrix, Claude | (sheikyerboudi) | Burnt Weeny Sandwich | 28 |
| 40. | Pfiester, Jack | (sheikyerboudi) | Burnt Weeny Sandwich | 28 |
| 41. | Chesbro, Jack | (sheikyerboudi) | Dog Breath in the YearOfThePlague | 28 |
| 42. | Drysdale, Don | (dynasty) | Charlotte Spiders | 28 |
| 43. | Drabek, Doug | (walle-1) | Denver Eagles | 27 |
| 44. | Iwakuma, Hisashi | Chicago Reapers | 27 | |
| 45. | Palmer, Jim | (aj082) | Banfield Banshees | 27 |
| 46. | Young, Cy | (filler) | Alaska Red Bears | 27 |
| 47. | Feller, Bob | (dynasty8) | Nevada Snakes | 27 |
| 48. | Pfiester, Jack | (dynasty8) | Kansas Grasshoppers | 27 |
| 49. | Shields, James | (pwdown55) | Montreal Voyageurs | 27 |
| 50. | Kluber, Corey | (jaredhamann) | Kentucky Horses | 27 |
