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 | Texas Outlaws | 15.0 | |
| 3. | Hendriks, Liam | Arizona Suns | 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) | Arizona Suns | 14.4 |
| 10. | Chapman, Aroldis | (filler8) | New Jersey Devils | 14.3 |
| 11. | Diaz, Edwin | (Grw3) | Hartford Hot Rods | 14.4 |
| 12. | Kimbrel, Craig | Arizona Suns | 14.3 | |
| 13. | Diaz, Edwin | (Alfc10) | San Diego Sharks | 14.3 |
| 14. | Williams, Devin | (mgm7) | Iowa Pigs | 14.3 |
| 15. | Yates, Kirby | Kentucky Horses | 14.3 | |
| 16. | Kimbrel, Craig | (jeffery2323) | Halifax Hatchet Women | 14.2 |
| 17. | Chapman, Aroldis | (foe323llle) | Grand Canyon Vixens | 14.2 |
| 18. | Hader, Josh | (KOOGS) | San Antonio Cats | 14.1 |
| 19. | Diaz, Edwin | (jlaw1977ab) | Santa Monica Sultry Sirens | 14.2 |
| 20. | Iglesias, Raisel | Kentucky Horses | 14.3 | |
| 21. | Sims, Lucas | (jbas524) | New Jersey Devils | 14.2 |
| 22. | Barnes, Matt | (BAR23) | Southeast Hornswogglers | 14.1 |
| 23. | Williams, Devin | (BAR23) | Boston Bees | 14.1 |
| 24. | Diaz, Edwin | (Texashorns2023) | Las Vegas Gladiators | 14.1 |
| 25. | Thornburg, Tyler | (dynasty) | Carolina Bulldogs | 14.1 |
| 26. | Hader, Josh | (walle-1) | Phoenix Dragons | 14.2 |
| 27. | Rogers, Taylor | (salukisam) | Saluki Slick | 14.2 |
| 28. | Diaz, Edwin | (filler) | Chicago Reapers | 14.0 |
| 29. | Kimbrel, Craig | Pittsburgh Plunder | 14.1 | |
| 30. | Thielbar, Caleb | Portland Vikings | 14.1 | |
| 31. | Lidge, Brad | (befulton) | Pittsburgh Demon Dogs | 14.0 |
| 32. | Sewald, Paul | (finalbody) | Minnesota Frogs | 14.1 |
| 33. | Giles, Ken | (sgt714) | Boston Red Sox | 14.0 |
| 34. | Kimbrel, Craig | (BAR23) | Raleigh Jets | 14.1 |
| 35. | Karinchak, James | (dynasty8) | Salem Demons | 14.0 |
| 36. | Kimbrel, Craig | (dynasty8) | New Jersey Devils | 14.0 |
| 37. | Kimbrel, Craig | Utah Nightmares | 14.0 | |
| 38. | Kimbrel, Craig | (Paynefree) | Balmer Yardbirds | 14.0 |
| 39. | Hader, Josh | (filler) | Phoenix Dragons | 13.9 |
| 40. | Kimbrel, Craig | (bigror25) | Canarsie Canibals | 14.1 |
| 41. | Chapman, Aroldis | (jas202) | Ashtabula Ants | 14.0 |
| 42. | Sewald, Paul | (doughboys) | Montreal Royale | 13.9 |
| 43. | Kimbrel, Craig | (Midget) | Skandia HairLip Midgets | 13.9 |
| 44. | Thielbar, Caleb | (rennies) | Chicago Nine | 13.9 |
| 45. | Thielbar, Caleb | (filler) | Minnesota Frogs | 13.9 |
| 46. | Hader, Josh | (nickachap) | Akron RubberDucks | 13.9 |
| 47. | Neshek, Pat | (walle-1) | Montana Ducks | 13.9 |
| 48. | Diaz, Edwin | (dynasty8) | Florida Crabs | 13.9 |
| 49. | Treinen, Blake | (filler) | Iowa Pigs | 13.8 |
| 50. | Chapman, Aroldis | (sheus37393) | Texas Outlaws | 13.9 |
