Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (SO/9)
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. | Hader, Josh | (hanson) | Batavia Muckdogs | 15.3 |
| 2. | Hudson, Daniel | (filler) | Boston Bees | 15.0 |
| 3. | Hendriks, Liam | (rennies) | Dark Side Panthers | 14.8 |
| 4. | Hendriks, Liam | (Grantmoyer) | Darby Creek Brewers | 14.6 |
| 5. | Bautista, Félix | (terrytwotones22) | Huxley Huskies | 14.5 |
| 6. | Boxberger, Brad | (sethb33) | Brooklyn Knishes | 14.5 |
| 7. | Kimbrel, Craig | (terrytwotones22) | Arnolds Park Aristocrats | 14.5 |
| 8. | Hader, Josh | (cunnythumber) | Chicago Reapers | 14.6 |
| 9. | Diaz, Edwin | (filler8) | Pittsburgh Plunder | 14.4 |
| 10. | Chapman, Aroldis | (walle-1) | Kentucky Horses | 14.3 |
| 11. | Kimbrel, Craig | (ehuynh908) | Arizona Suns | 14.3 |
| 12. | Williams, Devin | (mgm7) | Iowa Pigs | 14.3 |
| 13. | Yates, Kirby | (filler8) | Chicago Reapers | 14.3 |
| 14. | Kimbrel, Craig | (jeffery2323) | Halifax Hatchet Women | 14.2 |
| 15. | Chapman, Aroldis | (foe323llle) | Grand Canyon Vixens | 14.2 |
| 16. | Hader, Josh | (KOOGS) | San Antonio Cats | 14.1 |
| 17. | Diaz, Edwin | (jlaw1977ab) | Santa Monica Sultry Sirens | 14.2 |
| 18. | Iglesias, Raisel | (dynasty) | Salem Demons | 14.3 |
| 19. | Sims, Lucas | (filler8) | Sacramento Lions | 14.2 |
| 20. | Williams, Devin | (BAR23) | Boston Bees | 14.1 |
| 21. | Diaz, Edwin | (Texashorns2023) | Las Vegas Gladiators | 14.1 |
| 22. | Thornburg, Tyler | Carolina Bulldogs | 14.1 | |
| 23. | Hader, Josh | (dynasty) | New Jersey Devils | 14.2 |
| 24. | Rogers, Taylor | (salukisam) | Saluki Slick | 14.2 |
| 25. | Diaz, Edwin | (filler8) | Charlotte Spiders | 14.0 |
| 26. | Kimbrel, Craig | (filler8) | Phoenix Dragons | 14.1 |
| 27. | Thielbar, Caleb | (brian4656) | Portland Vikings | 14.1 |
| 28. | Lidge, Brad | (befulton) | Pittsburgh Demon Dogs | 14.0 |
| 29. | Giles, Ken | (Sgt714) | Boston Red Sox | 14.0 |
| 30. | Kimbrel, Craig | (Wileydog97) | Raleigh Jets | 14.1 |
| 31. | Kimbrel, Craig | (walle-1) | San Diego Sharks | 14.0 |
| 32. | Kimbrel, Craig | Balmer Yardbirds | 14.0 | |
| 33. | Kimbrel, Craig | (bigror25) | Canarsie Canibals | 14.1 |
| 34. | Chapman, Aroldis | Ashtabula Ants | 14.0 | |
| 35. | Sewald, Paul | (doughboys) | Montreal Royale | 13.9 |
| 36. | Kimbrel, Craig | (finalbody) | Arizona Suns | 13.9 |
| 37. | Thielbar, Caleb | (filler) | San Diego Sharks | 13.9 |
| 38. | Thielbar, Caleb | (rennies) | Chicago Nine | 13.9 |
| 39. | Hader, Josh | (nickachap) | Akron RubberDucks | 13.9 |
| 40. | Neshek, Pat | Montana Ducks | 13.9 | |
| 41. | Diaz, Edwin | (walle-1) | Alaska Red Bears | 13.9 |
| 42. | Treinen, Blake | (dynasty) | Kansas Grasshoppers | 13.8 |
| 43. | Chapman, Aroldis | (sheus37393) | New Jersey Jackals | 13.9 |
| 44. | Hendriks, Liam | (xaxa) | MISSOURI MULES | 13.9 |
| 45. | Chapman, Aroldis | (Brnkin1970) | WorldWide ClasStiks 2.0 | 13.9 |
| 46. | Chapman, Aroldis | (Trulaia) | Texas Outlaws | 13.9 |
| 47. | Alvarado, Jose | (dynasty) | Salem Demons | 13.8 |
| 48. | Kimbrel, Craig | (jeter0296) | Freehold Yankees | 13.8 |
| 49. | Sewald, Paul | Carolina Bulldogs | 13.9 | |
| 50. | Pressly, Ryan | (Myunclepunk) | Chicago Jets | 13.8 |
