Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (SO/9)
| 1. | Kimbrel, Craig | (jgasunas) | Mankato MoonDogs | 15.2 |
| 2. | Kimbrel, Craig | (malael) | New York Highlanders | 15.0 |
| 3. | Knebel, Corey | (doittoitlars) | Arizona Mustangs | 14.9 |
| 4. | Lidge, Brad | (timyoung) | Kansas City Monarchs | 14.8 |
| 5. | Uehara, Koji | (tsnets) | Boro Jokers | 14.5 |
| 6. | Kimbrel, Craig | (ThePort24) | Cresco Clashers | 14.4 |
| 7. | Betances, Dellin | (mattholland1975) | Starved Rockers | 14.3 |
| 8. | Edwards, Carl | (maddog) | Toronto Inferno | 14.4 |
| 9. | Chapman, Aroldis | (bltz524) | Seaside Heights Sand Travelers | 14.4 |
| 10. | Kimbrel, Craig | (chapman) | Jokes On You Fighting Clowns | 14.3 |
| 11. | Kimbrel, Craig | (Whonet) | Minnesota Froggers | 14.3 |
| 12. | Hand, Brad | (joemcg) | OC Prospectors | 14.3 |
| 13. | Kimbrel, Craig | (boomba) | Albuquerque Blue Crystals | 14.2 |
| 14. | Miller, Andrew | (Axlrose) | Las Vegas Alcoholics | 14.2 |
| 15. | Kimbrel, Craig | (roguerouge) | Boston Terriers | 14.3 |
| 16. | Hader, Josh | (ressien) | Fremont Huskies | 14.2 |
| 17. | Allen, Cody | (skeet1474) | Pulteney Rebels | 14.1 |
| 18. | Kimbrel, Craig | (Charlie22) | DC Peeps | 14.2 |
| 19. | Robertson, David | (Warrior) | San Antonio Suns | 14.1 |
| 20. | Betances, Dellin | (lasershow) | Burger Kings | 14.2 |
| 21. | Clippard, Tyler | (ColinBoucher) | Derelict Winos | 14.1 |
| 22. | Knebel, Corey | (Dmurphy) | Island Coast Gators | 14.1 |
| 23. | Betances, Dellin | (WhyNot89) | Bedrock Water Buffalo | 14.2 |
| 24. | Givens, Mychal | (shermanator) | Montreal Expos | 14.1 |
| 25. | Kimbrel, Craig | (Tonypsu7) | Wilmington Quakers | 13.9 |
| 26. | Kimbrel, Craig | (Trulaia) | Collinsville Cobras | 13.9 |
| 27. | Betances, Dellin | (Mromito) | Baseball Baseball | 14.0 |
| 28. | Betances, Dellin | (dieselduro) | Havana Hurricanes | 14.0 |
| 29. | Goody, Nick | (vanDusen) | Nippes Swingin‘ Bats | 13.8 |
| 30. | Diaz, Edwin | (habsco) | Chicago Cub | 13.9 |
| 31. | Diaz, Edwin | (mattholland1975) | Durango Drunk Cowboys | 13.8 |
| 32. | Doolittle, Sean | (filler) | Springfield Top Hats | 13.7 |
| 33. | Betances, Dellin | (alphabeta) | Anheuser-Busch Buds | 13.8 |
| 34. | Edwards, Carl | (drh4740) | Portland Frogs | 13.8 |
| 35. | Kimbrel, Craig | (UNHBombers) | Stowe UNH Bombers | 13.8 |
| 36. | Giles, Ken | (doittoitlars) | Arizona Mustangs | 13.9 |
| 37. | Robertson, David | (BigRedMachine90) | Huntington Vipers | 13.8 |
| 38. | Capps, Carter | (michelb3514) | Iowa Corn Pickers | 13.8 |
| 39. | Knebel, Corey | (thewrightstuff) | Uniondale Firebirds | 13.8 |
| 40. | Yates, Kirby | (roguerouge) | Gary-Southshore Railcats | 13.7 |
| 41. | Kimbrel, Craig | (doughboys) | Mini Doughboys | 13.8 |
| 42. | Kimbrel, Craig | (andjarthur) | Western Carolina Loggers | 13.7 |
| 43. | Yates, Kirby | (blushingpansy) | Yosemite Enemy Sea Anemones | 13.7 |
| 44. | Yates, Kirby | (ironwill1) | Cincinnati Sluggers | 13.7 |
| 45. | Capps, Carter | (dwb92361) | Anderson Ballers | 13.7 |
| 46. | Betances, Dellin | (Jsuer1971) | Lancaster Farmers | 13.6 |
| 47. | Yates, Kirby | (tda81) | Denver MicroBrews | 13.8 |
| 48. | Perez, Rafael | (michelb3514) | Blue Grass Bombers | 13.8 |
| 49. | Robertson, David | (zigwiggity) | Nuevo México Mariachis | 13.7 |
| 50. | Nathan, Joe | Spokane Cheifs | 13.6 |