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 | (dunroche) | Toledo Mudhens | 71 |
| 2. | Koufax, Sandy | (dunroche) | Chenango Wolves | 70 |
| 3. | Kluber, Corey | (dunroche) | South Dakota Dragons | 68 |
| 4. | Cole, Gerrit | (dunroche) | Washington Racin' Rebels | 68 |
| 5. | Marichal, Juan | (dunroche) | Philadelphia Sweet Dees | 67 |
| 6. | Koufax, Sandy | (dunroche) | Tuvalu Copras | 67 |
| 7. | Hunter, Catfish | (dunroche) | Philadelphia Sweet Dees | 64 |
| 8. | Kluber, Corey | (dunroche) | Chenango Wolves | 64 |
| 9. | McLain, Denny | (dunroche) | Chenango Wolves | 64 |
| 10. | Byrd, Paul | (kevin0gonzales) | Columbia Vikings | 63 |
| 11. | Koufax, Sandy | (dunroche) | Ohio Stealers | 62 |
| 12. | Gibson, Bob | (dunroche) | Tuvalu Copras | 62 |
| 13. | Haren, Dan | (filler) | Indiana Cubs | 62 |
| 14. | Haren, Dan | (Bluejays2) | Boston Bees | 61 |
| 15. | Sutton, Don | (dunroche) | South Dakota Dragons | 61 |
| 16. | Tanana, Frank | (filler8) | Big papa Kekumbas | 61 |
| 17. | Moyer, Jamie | (kevin0gonzales) | Texas Tornado | 61 |
| 18. | Greinke, Zack | (filler8) | Simsbury Cats | 61 |
| 19. | McLain, Denny | (dunroche) | Nevada Racin' Rebels | 60 |
| 20. | Wood, Wilbur | (filler) | Desert City Drifters | 60 |
| 21. | Marichal, Juan | (dunroche) | Ohio Stealers | 60 |
| 22. | Marichal, Juan | (dynasty8) | All-Valley Buzz | 60 |
| 23. | Colon, Bartolo | (abb) | Marietta Tomahawks | 60 |
| 24. | Strider, Spencer | ARKANSAS SLAMMERS | 60 | |
| 25. | Kluber, Corey | (dunroche) | Philadelphia Sweet Dees | 60 |
| 26. | Sabathia, CC | (dynasty) | Jersey Jets | 60 |
| 27. | Millwood, Kevin | (filler) | Flying Raptors | 59 |
| 28. | Iwakuma, Hisashi | (KCRockies) | Indiana Orioles | 59 |
| 29. | Radke, Brad | (dynasty) | who let the wierdos out | 59 |
| 30. | Marichal, Juan | (dunroche) | Toledo Mudhens | 59 |
| 31. | Lilly, Ted | (filler) | Cooperstown Poodles | 59 |
| 32. | Santana, Johan | (dunroche) | Nevada Racin' Rebels | 58 |
| 33. | Seaver, Tom | (rowdy1982) | Marshall Young Herd | 58 |
| 34. | Neagle, Denny | (dynasty) | American Eagles | 58 |
| 35. | Marichal, Juan | (HoustonCougar) | Houston Colt 45's | 58 |
| 36. | Severino, Luis | (filler8) | Tampa Tigers | 58 |
| 37. | Marichal, Juan | (dynasty) | San diego Bulldogs | 58 |
| 38. | Cueto, Johnny | (dunroche) | South Dakota Dragons | 58 |
| 39. | Lilly, Ted | (filler8) | Tallahassee Lumberjacks | 58 |
| 40. | Tanana, Frank | (babyave1) | Naples Lakers | 58 |
| 41. | Webb, Logan | (filler8) | Limoilou Bankstealers | 58 |
| 42. | Scott, Mike | (baseballpi) | Louisville Devils | 57 |
| 43. | Marichal, Juan | (bostontex24) | New England Lights Out | 57 |
| 44. | Greinke, Zack | (Drookie) | Akron RubberDucks | 57 |
| 45. | Tanaka, Masahiro | (Cunnythumber) | Des Moines Dumbos | 57 |
| 46. | Jenkins, Fergie | (filler8) | MALIBU SURFERS | 57 |
| 47. | McNally, Dave | (dunroche) | Detroit Tigers | 57 |
| 48. | Schmidt, Jason | (mintwinsfan) | Savannah Sand Gnats | 57 |
| 49. | Kershaw, Clayton | (Myunclepunk) | Chicago Pounders | 57 |
| 50. | Kershaw, Clayton | (abcjz) | Minnesota Froggers | 57 |
