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 | (Duckpv21) | Montana Ducks | 14.8 |
| 4. | Hendriks, Liam | (Grantmoyer) | Darby Creek Brewers | 14.6 |
| 5. | Bautista, Félix | (BAR23) | Nevada Snakes | 14.5 |
| 6. | Boxberger, Brad | (JoeyT2870) | Asheville Aces | 14.5 |
| 7. | Kimbrel, Craig | (LDJS1947) | NEVADA SNAKES | 14.5 |
| 8. | Hader, Josh | (cunnythumber) | Chicago Reapers | 14.6 |
| 9. | Diaz, Edwin | North Third Blue Sox | 14.4 | |
| 10. | Chapman, Aroldis | (walle-1) | Toronto Tigers | 14.3 |
| 11. | Diaz, Edwin | (Grw3) | Hartford Hot Rods | 14.4 |
| 12. | Kimbrel, Craig | (walle-2) | Las Vegas Gladiators | 14.3 |
| 13. | Diaz, Edwin | San Diego Sharks | 14.3 | |
| 14. | Williams, Devin | (mgm7) | Iowa Pigs | 14.3 |
| 15. | Yates, Kirby | Charlotte Spiders | 14.3 | |
| 16. | Kimbrel, Craig | (filler) | Louisiana Gators | 14.2 |
| 17. | Chapman, Aroldis | (dynasty) | Iowa Pigs | 14.2 |
| 18. | Hader, Josh | (KOOGS) | San Antonio Cats | 14.1 |
| 19. | Diaz, Edwin | (walle-2) | Portland Vikings | 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 | (walle-1) | Boulder Cavemen | 14.1 |
| 26. | Hader, Josh | (walle-1) | Chicago Reapers | 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. | Hendriks, Liam | Louisiana Gators | 14.0 | |
| 32. | Lidge, Brad | (befulton) | Pittsburgh Demon Dogs | 14.0 |
| 33. | Sewald, Paul | (hanson) | Salem Sorcerers | 14.1 |
| 34. | Giles, Ken | (sgt714) | Boston Red Sox | 14.0 |
| 35. | Kimbrel, Craig | (Wileydog97) | Raleigh Jets | 14.1 |
| 36. | Karinchak, James | Florida Crabs | 14.0 | |
| 37. | Kimbrel, Craig | (dynasty) | Texas Outlaws | 14.0 |
| 38. | Kimbrel, Craig | (walle-2) | New Jersey Devils | 14.0 |
| 39. | Kimbrel, Craig | (kevin90301) | Phoenix Dragons | 14.0 |
| 40. | Williams, Devin | Carolina Bulldogs | 14.0 | |
| 41. | Hader, Josh | (filler) | Dallas Mustangs | 13.9 |
| 42. | Kimbrel, Craig | (bigror25) | Canarsie Canibals | 14.1 |
| 43. | Chapman, Aroldis | (filler) | Dallas Mustangs | 14.0 |
| 44. | Sewald, Paul | (doughboys) | Montreal Royale | 13.9 |
| 45. | Kimbrel, Craig | (strohjo) | Cambridge Expos | 13.9 |
| 46. | Thielbar, Caleb | (filler) | Phoenix Dragons | 13.9 |
| 47. | Thielbar, Caleb | (Texashorns2023) | Chicago Hurlers | 13.9 |
| 48. | Hader, Josh | (nickachap) | Akron RubberDucks | 13.9 |
| 49. | Neshek, Pat | (walle-1) | Seattle Sloths | 13.9 |
| 50. | Diaz, Edwin | (dynasty8) | Florida Crabs | 13.9 |
