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. | Richards, Trevor | (Charles_graf) | Indiana Diablos | 38 |
| 2. | Iglesias, Raisel | (Iamcota) | West Running Brook Bashing Bears | 29 |
| 3. | Palmer, Jim | Balmer Yard Birds | 28 | |
| 4. | Boddicker, Mike | (befulton) | NC Black Dogs | 28 |
| 5. | Fujimoto, Hideo | (glansgruber) | Honda Ruckus | 28 |
| 6. | Hernandez, Roberto | (masimo29) | Rhode Island Waves | 28 |
| 7. | Fujimoto, Hideo | (DaveH) | Shochiku Robins | 28 |
| 8. | Fujimoto, Hideo | (DaveH) | Shochiku Robins | 28 |
| 9. | Anderson, Nick | (Dash) | American Dreams | 28 |
| 10. | Schilling, Curt | (bravesroy) | Hackensack Hawkeyes | 27 |
| 11. | Vance, Dazzy | (gibblets1973) | Long Beach NL Lawmen | 27 |
| 12. | Hunter, Catfish | (kingstreet) | Singapore Slingers | 27 |
| 13. | Johnson, Randy | (Mrploppie) | New London Sharks | 27 |
| 14. | deGrom, Jacob | (Ruthbonds) | Parma FrOGGIES | 27 |
| 15. | Tudor, John | (roguerouge) | Philadelphia Labor Knights | 27 |
| 16. | Rogers, Steve | (gibblets1973) | El Paso Diablos | 27 |
| 17. | Koufax, Sandy | (Tjm) | Ravenwood Dukes | 27 |
| 18. | Hernandez, Felix | (denniskitts1313) | Buzzing Brawlers | 27 |
| 19. | Carlton, Steve | The 1970's F.E.L.I.X | 27 | |
| 20. | Richard, J.R. | (MikeDrop0221) | Harrisburg Hornets | 26 |
| 21. | Richard, J.R. | (maharacer) | Farallon Whites | 26 |
| 22. | Johnson, Randy | (Trulaia) | Revenge of Samson | 26 |
| 23. | Clemens, Roger | Chittenango Wizards of Oz | 26 | |
| 24. | Brown, Mordecai | (chaaad) | Queens College Knights | 26 |
| 25. | Cone, David | (roots) | Washington SENATORS | 26 |
| 26. | McKenzie, Triston | (JayHawkGamez) | Nashville Sounds | 26 |
| 27. | deGrom, Jacob | (Tjm) | Prison Break | 26 |
| 28. | Martinez, Pedro | Seoul Rolling Quartz | 26 | |
| 29. | Ryan, Nolan | (RoyHobbs) | Texas Nut Busters | 26 |
| 30. | Starffin, Victor | (gibblets1973) | Bally Haly Bay Stars | 26 |
| 31. | Scherzer, Max | (vonveezil) | ARKANSAS Angels | 26 |
| 32. | Sugiuchi, Toshiya | (gibblets1973) | Bally Haly Bay Stars | 26 |
| 33. | Arrieta, Jake | Washington Angels | 26 | |
| 34. | Garrelts, Scott | (gibblets1973) | Torbay Tides | 26 |
| 35. | Nola, Aaron | (dgeorgi) | STEPPIN WOLF MAGIC CARPET RIDE | 26 |
| 36. | deGrom, Jacob | (BAR23) | Royal Hill Lions | 26 |
| 37. | Martinez, Pedro | (bdavids28) | Desert City Drifters | 26 |
| 38. | Kershaw, Clayton | (MikeDrop0221) | Boston Bees | 26 |
| 39. | Gomez, Lefty | (Phillyfan) | Birdsboro Bisons | 26 |
| 40. | Johnson, Walter | (chaaad) | Brooklyn Enterprise | 26 |
| 41. | Martinez, Pedro | (Wileydog97) | Raleigh Bulldogs | 26 |
| 42. | Alexander, Pete | (Tbone34) | Barker Bait | 26 |
| 43. | Fernandez, Sid | (Mortamar1966) | Kansas City Monarchs | 26 |
| 44. | Youmans, Floyd | Kansas City Monarchs | 26 | |
| 45. | Richard, J.R. | (bjack) | New London Sharks | 26 |
| 46. | Maddux, Greg | (babyave1) | Boston BigHats | 26 |
| 47. | Walsh, Ed | (chaaad) | Rutgers Scarlet Knights | 26 |
| 48. | Clemens, Roger | (EdgarSFuego) | TEX TEX | 26 |
| 49. | Arrieta, Jake | (chaaad) | New York Knickerbockers | 26 |
| 50. | Maddux, Greg | (chaaad) | New York Knickerbockers | 26 |
