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. | Robertson, David | (RanceRaptor) | Rockin' Robins | 1.4 |
| 2. | Feliz, Neftali | (dunroche) | Washington Angry Ducks | 1.7 |
| 3. | Hand, Brad | (sjmph87) | Harrisburg Lookouts | 1.9 |
| 4. | Bottalico, Ricky | (jim2miller) | Ohio Bandits | 2.1 |
| 5. | Valverde, Jose | (wheelsofterror) | Saint-Louis C.K's | 2.1 |
| 6. | McHugh, Collin | (Barefootstomp) | Appalachian Moonshiners | 2.2 |
| 7. | Britton, Zach | (skieff) | Hustons Mill YardHawks | 2.2 |
| 8. | Dibble, Rob | (dbutts) | Burlington Bees | 2.3 |
| 9. | Edwards, Carl | (blinnk281) | Denver Demon Donkeys | 2.3 |
| 10. | Street, Huston | (Durango) | Durango Bulls | 2.3 |
| 11. | Marmol, Carlos | (plpl512) | Portland Beavers | 2.3 |
| 12. | Betances, Dellin | (sytsmab) | Providence Grays | 2.4 |
| 13. | Hader, Josh | (gate-mouth) | Humbolt 💰⚾ | 2.4 |
| 14. | Saucier, Kevin | (JXavier71) | Gotham Dark Knights | 2.4 |
| 15. | Boxberger, Brad | (richgibson) | Asbury Park LUMPEN PROLS | 2.4 |
| 16. | Kimbrel, Craig | (LDJS1947) | WOODSTONE WARRIORS | 2.4 |
| 17. | Oh, Seung-hwan | (RichBaseballGuy) | Hartford Steamed Burgers | 2.5 |
| 18. | Radatz, Dick | (baseball4ever) | Golden Age Memories | 2.4 |
| 19. | Edwards, Carl | (BigRedMachine90) | Beating My Snake | 2.5 |
| 20. | Kimbrel, Craig | (jamin) | Chester Springs Menjai | 2.5 |
| 21. | Gagne, Eric | (ironwill1) | Reading Royals | 2.5 |
| 22. | Kimbrel, Craig | (ashrlvrdg) | Lancaster Barnstormers | 2.5 |
| 23. | Valverde, Jose | (whiskybiz) | Batting Gloves | 2.5 |
| 24. | Green, Chad | (jimgriddy) | Manatee River Bandits | 2.5 |
| 25. | Miller, Andrew | (Bluesig) | Barañaque Black Ocelots | 2.5 |
| 26. | Adams, Mike | (4sibsc) | Mayberry Griffins | 2.5 |
| 27. | Gagne, Eric | (mattholland1975) | Scottsdale Suns | 2.6 |
| 28. | Kimbrel, Craig | (Trulaia) | city players | 2.6 |
| 29. | Hader, Josh | (super) | Fargo Freeze | 2.6 |
| 30. | Feliz, Neftali | (Consigliere33) | Chicago Cubs | 2.6 |
| 31. | Kimbrel, Craig | (goingyard) | Iowa Spank’sters | 2.6 |
| 32. | Wagner, Billy | (tbone34) | Texas Tomahawks | 2.6 |
| 33. | Papelbon, Jonathan | (kingstreet) | Singapore Slingers | 2.6 |
| 34. | Feliz, Neftali | (dunroche) | Washington Angry Ducks | 2.6 |
| 35. | Street, Huston | (welchbw) | Schenectady Southpaws | 2.6 |
| 36. | Marmol, Carlos | (revh) | Beuhlah Land Bunyans | 2.6 |
| 37. | Papelbon, Jonathan | (nycubsfan) | Sugarland Skeeters | 2.6 |
| 38. | Papelbon, Jonathan | (chaaad) | New York Black Yankees | 2.6 |
| 39. | Adams, Mike | (dunroche) | Carolina Mad Ducks | 2.6 |
| 40. | Kuo, Hong-Chih | (dunroche) | Nashville Sounds | 2.6 |
| 41. | Street, Huston | (dunroche) | South Texas Killer Bees | 2.7 |
| 42. | Wagner, Billy | (nycubsfan) | Goshen Gorillas | 2.7 |
| 43. | Chapman, Aroldis | (screamNchicken) | Boston Bees | 2.7 |
| 44. | Chapman, Aroldis | (Sugarland) | Chicago Colts | 2.6 |
| 45. | Kimbrel, Craig | (jimgriddy) | Manatee River Bandits | 2.7 |
| 46. | Bard, Daniel | (welchbw) | Stalingrad Komrades | 2.6 |
| 47. | Soriano, Rafael | (sheikyerboudi) | Hawaii Five 0's | 2.7 |
| 48. | Nen, Robb | (jamin) | Chester Springs Menjai | 2.7 |
| 49. | Street, Huston | (dcwabdi) | Allentown Dogs | 2.7 |
| 50. | Percival, Troy | (michelb3514) | Iowa Corn Pickers | 2.6 |