Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Homers Allowed)
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. | Marichal, Juan | (filler) | Miami Serpents | 71 |
| 2. | Koufax, Sandy | (jaredhamann) | Kentucky Horses | 70 |
| 3. | Kluber, Corey | (walle-1) | Louisiana Gators | 68 |
| 4. | Cole, Gerrit | (dynasty) | Atlanta Gorillas | 68 |
| 5. | Marichal, Juan | (AR00) | Sideshow Bobs | 67 |
| 6. | Koufax, Sandy | (jrobandsteal) | NASHVILLE NIGHT RIDERS | 67 |
| 7. | Kluber, Corey | (jaredhamann) | Kentucky Horses | 64 |
| 8. | McLain, Denny | (jaredhamann) | Kentucky Horses | 64 |
| 9. | Hunter, Catfish | (AR00) | Sideshow Bobs | 64 |
| 10. | Byrd, Paul | (dynasty) | Kansas Grasshoppers | 63 |
| 11. | Haren, Dan | Montana Ducks | 62 | |
| 12. | Gibson, Bob | (jrobandsteal) | NASHVILLE NIGHT RIDERS | 62 |
| 13. | Koufax, Sandy | (chaaad) | Weeksville Unknown | 62 |
| 14. | Greinke, Zack | (crease01) | Rochester Red Wings | 61 |
| 15. | Sutton, Don | (walle-1) | Louisiana Gators | 61 |
| 16. | Moyer, Jamie | (tribetime89) | Texas Tornado | 61 |
| 17. | Haren, Dan | Templar Knights | 61 | |
| 18. | Tanana, Frank | (cjisboss) | San Francisco SATELLITEOFLOVE | 61 |
| 19. | Wood, Wilbur | (Griff) | Desert City Drifters | 60 |
| 20. | McLain, Denny | (chaaad) | Queensborough CC Tigers | 60 |
| 21. | Marichal, Juan | (chaaad) | BX Bombers | 60 |
| 22. | Strider, Spencer | (JoeyT2870) | Cleveland Gladiators | 60 |
| 23. | Colon, Bartolo | (bostontex24) | Boston Tomahawks | 60 |
| 24. | Marichal, Juan | (coachmcs) | Virginia Vibrators | 60 |
| 25. | Kluber, Corey | (AR00) | Sideshow Bobs | 60 |
| 26. | Marichal, Juan | (chaaad) | Weeksville Unknown | 60 |
| 27. | Lilly, Ted | (walle-1) | Toronto Tigers | 59 |
| 28. | Iwakuma, Hisashi | Seattle Sloths | 59 | |
| 29. | Marichal, Juan | (Rainman) | Carolina Bulldogs | 59 |
| 30. | Millwood, Kevin | (filler) | Milwaukee Skeletons | 59 |
| 31. | Radke, Brad | (finalbody) | Phoenix Dragons | 59 |
| 32. | Santana, Johan | (chaaad) | Queensborough CC Tigers | 58 |
| 33. | Wells, David | (L2P) | Baltimore Bulldogs | 58 |
| 34. | Webb, Logan | (finalbody) | Nevada Snakes | 58 |
| 35. | Seaver, Tom | (Cg4177) | Cincinnati Silverbacks | 58 |
| 36. | Cueto, Johnny | (walle-1) | Louisiana Gators | 58 |
| 37. | Severino, Luis | Phoenix Dragons | 58 | |
| 38. | Marichal, Juan | (HoustonCougar) | Houston Colt 45's | 58 |
| 39. | Lilly, Ted | Atlanta Gorillas | 58 | |
| 40. | Tanana, Frank | (babyave1) | Naples Lakers | 58 |
| 41. | Marichal, Juan | (Crackpot) | Yachats 🍄Fun Guys🍄 | 58 |
| 42. | Neagle, Denny | Louisiana Gators | 58 | |
| 43. | Kluber, Corey | Kansas Grasshoppers | 57 | |
| 44. | Marichal, Juan | (filler) | Miami Serpents | 57 |
| 45. | Marichal, Juan | (dynasty) | Pittsburgh Plunder | 57 |
| 46. | Haren, Dan | (kjcmeg13) | Balmer Yard Birds | 57 |
| 47. | Scott, Mike | (Pop) | Carolina Canes | 57 |
| 48. | Greinke, Zack | (nickachap) | Akron RubberDucks | 57 |
| 49. | Tanaka, Masahiro | Salem Demons | 57 | |
| 50. | Schmidt, Jason | Miami Serpents | 57 |
