Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (H/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. | Benitez, Armando | (chaaad) | Brooklyn Enterprise | 2.1 |
| 2. | Adams, Mike | (noahis2cul4u) | Chicago Outfit | 2.3 |
| 3. | Kimbrel, Craig | (Elitepro77) | South Dakota Cyclones | 2.7 |
| 4. | Chapman, Aroldis | (coachmcs) | Boston Bees | 2.9 |
| 5. | Workman, Brandon | (lasershow) | Ticked Tigers | 2.9 |
| 6. | Hader, Josh | (Snowman33) | Sun City Islanders | 3.0 |
| 7. | Benitez, Armando | (Huckleberry) | Philadelphia Phillies | 2.9 |
| 8. | Chapman, Aroldis | (bnewman58) | Macon Friends | 3.0 |
| 9. | Betances, Dellin | (Wileydog97) | Raleigh Stallions | 3.0 |
| 10. | Chapman, Aroldis | (chaaad) | New York Bluebirds | 3.1 |
| 11. | Gagne, Eric | (bdavids28) | Silver Jet | 3.1 |
| 12. | Marmol, Carlos | (Caphowdy504) | Springfield Troy McClures | 3.1 |
| 13. | Marmol, Carlos | (wduncan) | Hollywood Stars | 3.2 |
| 14. | Kimbrel, Craig | (MikeDrop0221) | PERRYVILLE PIRATES | 3.2 |
| 15. | Street, Huston | (bigror25) | Chicago Bratwurst | 3.2 |
| 16. | Jansen, Kenley | (rreebe916) | Manchester Marauders | 3.2 |
| 17. | Hader, Josh | (rreebe916) | Biloxi Blues | 3.3 |
| 18. | Chapman, Aroldis | (Artinshki) | Base Ball Classics | 3.3 |
| 19. | Hader, Josh | (Artinshki) | Base Ball Classics | 3.3 |
| 20. | Saito, Takashi | (montanajack) | Washington Huskies | 3.3 |
| 21. | Chapman, Aroldis | (Artinshki) | Base Ball Classics | 3.3 |
| 22. | Chapman, Aroldis | (nycubsfan) | Htown Skeeters | 3.3 |
| 23. | Chapman, Aroldis | (dunroche) | Washington Racin' Rebels | 3.3 |
| 24. | Betances, Dellin | (paranoid) | Las Vegas Silver Knights | 3.3 |
| 25. | Soria, Joakim | (roots) | El paso Predators | 3.3 |
| 26. | Adams, Mike | (michelb3514) | Iowa Corn Pickers | 3.3 |
| 27. | Boxberger, Brad | (idesofmarch) | Crieff Highlanders | 3.3 |
| 28. | Chapman, Aroldis | (Artinshki) | Base Ball Bambinos | 3.3 |
| 29. | Adams, Mike | (bostontex24) | Boston Commons | 3.3 |
| 30. | Marmol, Carlos | (BobbyCarnes) | St Louis Spiders | 3.3 |
| 31. | Wagner, Billy | (Majestic44) | Tacoma Predators | 3.3 |
| 32. | Boxberger, Brad | (tjm) | California WildFire | 3.3 |
| 33. | Adams, Mike | (tgbsbl1967) | Minot Minotaurs | 3.3 |
| 34. | Ottavino, Adam | (Drake8271) | Atlanta ATLiens | 3.3 |
| 35. | Street, Huston | (bnewman58) | Macon History | 3.3 |
| 36. | Boxberger, Brad | (hayzess) | Gilchrist Yellow Jackets | 3.4 |
| 37. | Kimbrel, Craig | (fuzzbox13) | All-Valley Buzz | 3.3 |
| 38. | Chapman, Aroldis | (Drake8271) | Atlanta ATLiens | 3.4 |
| 39. | Kimbrel, Craig | (mattholland1975) | Clearwater Crocs | 3.4 |
| 40. | Marmol, Carlos | (gibblets1973) | West End Wolves | 3.4 |
| 41. | Betances, Dellin | (filler) | Garret Hill Hilltoppers | 3.4 |
| 42. | Messersmith, Andy | (boetto) | Heroes to Zeros | 3.4 |
| 43. | Feliz, Neftali | (dynasty) | Georgia Swingmen | 3.4 |
| 44. | Adams, Mike | (filler8) | donghae Bvndits | 3.4 |
| 45. | McGraw, Tug | (rowdy1982) | Team Seven | 3.4 |
| 46. | Adams, Mike | (JohnHeidy) | High Desert Route 666ers | 3.4 |
| 47. | Alburquerque, Al | (Trulaia) | Stockton Stars | 3.4 |
| 48. | Feliz, Neftali | Boston Sox | 3.4 | |
| 49. | Gullett, Don | (Olwill) | Tennessee Muzzle loaders | 3.4 |
| 50. | Feliz, Neftali | (FJS) | Dark Roast Coffee Beans | 3.4 |
