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 | (lasershow) | Big Lion | 15.0 |
| 3. | Hendriks, Liam | (filler) | Kansas Grasshoppers | 14.8 |
| 4. | Hendriks, Liam | (Grantmoyer) | Darby Creek Brewers | 14.6 |
| 5. | Bautista, Félix | Nevada Snakes | 14.5 | |
| 6. | Boxberger, Brad | Asheville Aces | 14.5 | |
| 7. | Kimbrel, Craig | (Jimfas80) | NEVADA SNAKES | 14.5 |
| 8. | Hader, Josh | (cunnythumber) | Chicago Reapers | 14.6 |
| 9. | Diaz, Edwin | (filler) | Carolina Bulldogs | 14.4 |
| 10. | Chapman, Aroldis | Toronto Tigers | 14.3 | |
| 11. | Diaz, Edwin | (Grw3) | Hartford Hot Rods | 14.4 |
| 12. | Kimbrel, Craig | (filler) | San Diego Sharks | 14.3 |
| 13. | Diaz, Edwin | (Alfc10) | San Diego Sharks | 14.3 |
| 14. | Williams, Devin | (mgm7) | Iowa Pigs | 14.3 |
| 15. | Yates, Kirby | (filler8) | Utah Nightmares | 14.3 |
| 16. | Kimbrel, Craig | (purplefoodcolor) | Louisiana Gators | 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 | (dynasty8) | San Diego Sharks | 14.3 |
| 21. | Sims, Lucas | (jbas524) | Burnham Ol’ Ruffians | 14.2 |
| 22. | Barnes, Matt | (BAR23) | Southeast Hornswogglers | 14.1 |
| 23. | Williams, Devin | (BAR23) | Boston Bees | 14.1 |
| 24. | Diaz, Edwin | (Texashorns2023) | Tacoma Rainiers | 14.1 |
| 25. | Thornburg, Tyler | Boulder Cavemen | 14.1 | |
| 26. | Hader, Josh | (dynasty) | Dallas Mustangs | 14.2 |
| 27. | Rogers, Taylor | (salukisam) | Saluki Slick | 14.2 |
| 28. | Diaz, Edwin | (Daisy) | Pabst Blue Ribbons | 14.0 |
| 29. | Kimbrel, Craig | (walle-1) | Iowa Pigs | 14.1 |
| 30. | Thielbar, Caleb | (filler) | Nevada Snakes | 14.1 |
| 31. | Lidge, Brad | (befulton) | Pittsburgh Demon Dogs | 14.0 |
| 32. | Sewald, Paul | (hanson) | Salem Sorcerers | 14.1 |
| 33. | Giles, Ken | (sgt714) | Boston Red Sox | 14.0 |
| 34. | Kimbrel, Craig | (BAR23) | Raleigh Jets | 14.1 |
| 35. | Karinchak, James | (walle-1) | Alaska Red Bears | 14.0 |
| 36. | Kimbrel, Craig | (walle-1) | Pittsburgh Plunder | 14.0 |
| 37. | Kimbrel, Craig | New Jersey Devils | 14.0 | |
| 38. | Kimbrel, Craig | (ffgamer71) | Balmer Yardbirds | 14.0 |
| 39. | Hader, Josh | (filler) | San Diego Sharks | 13.9 |
| 40. | Kimbrel, Craig | (bigror25) | Canarsie Canibals | 14.1 |
| 41. | Chapman, Aroldis | (filler) | Dallas Mustangs | 14.0 |
| 42. | Sewald, Paul | (doughboys) | Montreal Royale | 13.9 |
| 43. | Kimbrel, Craig | (Midget) | Skandia HairLip Midgets | 13.9 |
| 44. | Thielbar, Caleb | (filler) | Kentucky Horses | 13.9 |
| 45. | Thielbar, Caleb | Chicago Hurlers | 13.9 | |
| 46. | Hader, Josh | (nickachap) | Akron RubberDucks | 13.9 |
| 47. | Neshek, Pat | (dynasty) | Denver Eagles | 13.9 |
| 48. | Diaz, Edwin | Florida Crabs | 13.9 | |
| 49. | Treinen, Blake | (filler) | Portland Vikings | 13.8 |
| 50. | Chapman, Aroldis | Texas Outlaws | 13.9 |
