Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Wins)
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. | Kimbrel, Craig | (filler8) | Atlanta Gorillas | 37 |
| 2. | Rogers, Steve | (wduncan) | Miami Cats | 30 |
| 3. | Gomez, Lefty | (filler8) | Chicago Reapers | 29 |
| 4. | Johnson, Walter | (tlambiase) | Frederick Blue Claws | 29 |
| 5. | Fujimoto, Hideo | (filler) | Kansas Grasshoppers | 28 |
| 6. | Palmer, Jim | (dynasty) | Arizona Suns | 28 |
| 7. | Boddicker, Mike | (befulton) | NC Black Dogs | 28 |
| 8. | Fujimoto, Hideo | Yonaguni Sharks | 28 | |
| 9. | Arrieta, Jake | (filler) | Phoenix Dragons | 28 |
| 10. | Mathewson, Christy | (Mortamar1966) | Heather Town Worm Riders | 28 |
| 11. | Richard, J.R. | (jas202) | San Diego Gwynns | 28 |
| 12. | Martinez, Pedro | (brian4656) | Florida Crabs | 28 |
| 13. | Johnson, Walter | Chicago Reapers | 28 | |
| 14. | Ford, Russ | (finalbody) | Kansas Grasshoppers | 28 |
| 15. | Maddux, Greg | (RichGibson) | Detorit PURPLE GANG | 28 |
| 16. | Johnson, Walter | (walle-1) | Sacramento Lions | 28 |
| 17. | Carlton, Steve | (filler) | Toronto Tigers | 27 |
| 18. | Nomo, Hideo | (Texashorns2023) | Kansai Locomotives | 27 |
| 19. | Rogers, Steve | (gibblets1973) | Dunnville Diablos | 27 |
| 20. | Stratton, Monty | (charlesgant68) | Muratti Peers | 27 |
| 21. | Nola, Aaron | (Schvitz) | Milwaukee Thiefs | 27 |
| 22. | Vance, Dazzy | (gibblets1973) | Long Beach NL Lawmen | 27 |
| 23. | Johnson, Randy | (dynasty8) | Atlanta Gorillas | 27 |
| 24. | Koufax, Sandy | (dynasty) | Denver Eagles | 27 |
| 25. | McNally, Dave | (dynasty) | Arizona Suns | 27 |
| 26. | deGrom, Jacob | (chaaad) | Cuban X-Giants | 27 |
| 27. | deGrom, Jacob | (filler) | Charlotte Spiders | 27 |
| 28. | Schmidt, Jason | (teamkev24) | Lemonade Stand Ducks | 27 |
| 29. | Higuera, Teddy | (maulucci16) | Base Robbers | 27 |
| 30. | Sutton, Don | (gibblets1973) | Badger Bulldogs | 27 |
| 31. | Arrieta, Jake | (Artinshki) | Base Ball Classics | 27 |
| 32. | Hernandez, Felix | (REVEJB) | Tao Braus | 27 |
| 33. | Maddux, Greg | (dynasty8) | New Jersey Devils | 27 |
| 34. | deGrom, Jacob | (bdavids28) | Greasy Jungle | 27 |
| 35. | Scott, Mike | (brawlers) | Texas Brawlers | 27 |
| 36. | Rogers, Steve | (kingstreet) | Singapore Slingers | 27 |
| 37. | Maddux, Greg | (filler) | Kentucky Horses | 27 |
| 38. | Martinez, Pedro | (charlesgant68) | Roanoke Rhinos | 27 |
| 39. | Carlton, Steve | (Theo_smith) | East Nashville Vinyl | 27 |
| 40. | Johnson, Randy | (Trilling) | LA Tanks | 26 |
| 41. | Halladay, Roy | (metfan1) | Bartonsville Pumas | 26 |
| 42. | Maddux, Greg | (jbas524) | Discovery Harbour Dirty Deeds | 26 |
| 43. | Mathewson, Christy | (chaaad) | BX Bombers | 26 |
| 44. | Scherzer, Max | (walle-1) | Carolina Bulldogs | 26 |
| 45. | Sugiuchi, Toshiya | (gibblets1973) | Bally Haly Bay Stars | 26 |
| 46. | Brown, Mordecai | (chaaad) | Queens College Knights | 26 |
| 47. | Garrelts, Scott | (gibblets1973) | Torbay Tides | 26 |
| 48. | Richard, J.R. | RENO GAMBLERS | 26 | |
| 49. | Tiant, Luis | (Wickettywack) | Coastal Redwoods | 26 |
| 50. | Rogers, Steve | (Mortamar1966) | Kansas City Monarchs | 26 |
