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) | Pittsburgh Plunder | 37 |
| 2. | Rogers, Steve | (wduncan) | Miami Cats | 30 |
| 3. | Gomez, Lefty | (filler) | Texas Outlaws | 29 |
| 4. | Johnson, Walter | (tlambiase) | Frederick Blue Claws | 29 |
| 5. | Palmer, Jim | (walle-1) | Las Vegas Gladiators | 28 |
| 6. | Boddicker, Mike | (befulton) | NC Black Dogs | 28 |
| 7. | Fujimoto, Hideo | (Choobinska) | Yonaguni Sharks | 28 |
| 8. | Arrieta, Jake | (dynasty) | Boulder Cavemen | 28 |
| 9. | Mathewson, Christy | (Mortamar1966) | Heather Town Worm Riders | 28 |
| 10. | Ford, Russ | (walle-2) | Utah Nightmares | 28 |
| 11. | Richard, J.R. | (jas202) | San Diego Gwynns | 28 |
| 12. | Maddux, Greg | (RichGibson) | Detorit PURPLE GANG | 28 |
| 13. | Martinez, Pedro | (filler) | Carolina Bulldogs | 28 |
| 14. | Fujimoto, Hideo | (Buckleyrm) | Kansas Grasshoppers | 28 |
| 15. | Johnson, Walter | (walle-1) | Charlotte Spiders | 28 |
| 16. | Johnson, Walter | (filler8) | Kansas Grasshoppers | 28 |
| 17. | Carlton, Steve | (filler) | Montana Ducks | 27 |
| 18. | Martinez, Dennis | (SilverSteel34) | Angleton Wildats | 27 |
| 19. | Maddux, Greg | Iowa Pigs | 27 | |
| 20. | deGrom, Jacob | (bdavids28) | Greasy Jungle | 27 |
| 21. | Gooden, Dwight | (teamkev24) | Gordon Gekkos | 27 |
| 22. | Rogers, Steve | (gibblets1973) | Dunnville Diablos | 27 |
| 23. | Higuera, Teddy | (maulucci16) | Base Robbers | 27 |
| 24. | McNally, Dave | Kansas Grasshoppers | 27 | |
| 25. | deGrom, Jacob | (chaaad) | Cuban X-Giants | 27 |
| 26. | deGrom, Jacob | (filler8) | Atlanta Gorillas | 27 |
| 27. | Brown, Mordecai | (chaaad) | Bayside Little League | 27 |
| 28. | Nola, Aaron | (Schvitz) | Milwaukee Thiefs | 27 |
| 29. | Tiant, Luis | Escape From The Bronx | 27 | |
| 30. | Hernandez, Felix | (revejb) | Tao Braos | 27 |
| 31. | Schmidt, Jason | (teamkev24) | Lemonade Stand Ducks | 27 |
| 32. | Scott, Mike | (brawlers) | Texas Brawlers | 27 |
| 33. | Sutton, Don | (gibblets1973) | Badger Bulldogs | 27 |
| 34. | Nomo, Hideo | (RyanPak) | Kansai Locomotives | 27 |
| 35. | Maddux, Greg | (Kaline65) | Kentucky Horses | 27 |
| 36. | Martinez, Pedro | (walle-2) | Kansas Grasshoppers | 27 |
| 37. | Carlton, Steve | (Theo_smith) | East Nashville Vinyl | 27 |
| 38. | Koufax, Sandy | (filler) | Dallas Mustangs | 27 |
| 39. | Vance, Dazzy | (gibblets1973) | Long Beach NL Lawmen | 27 |
| 40. | Johnson, Randy | (dynasty) | Boston Bees | 27 |
| 41. | Stratton, Monty | (charlesgant68) | Muratti Peers | 27 |
| 42. | Arrieta, Jake | (Artinshki) | Base Ball Classics | 27 |
| 43. | Rogers, Steve | (kingstreet) | Singapore Slingers | 27 |
| 44. | Righetti, Dave | (injuns) | Long Island Injuns | 26 |
| 45. | Nola, Aaron | Phoenix Dragons | 26 | |
| 46. | deGrom, Jacob | (filler) | Miami Serpents | 26 |
| 47. | Ryan, Nolan | (bnewman58) | Taipei Personalities | 26 |
| 48. | Turner, Jim | (dynasty8) | Texas Outlaws | 26 |
| 49. | deGrom, Jacob | (Rainman) | Portland Vikings | 26 |
| 50. | Palmer, Jim | (aaabob) | Windsor White's Other I's | 26 |
