Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Saves)
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. | Uehara, Koji | (nycubsfan) | Jackson Heights Knights | 63 |
| 2. | Doolittle, Sean | (nycubsfan) | Jackson Heights Knights | 63 |
| 3. | Wagner, Billy | (dunroche) | New York Knights | 61 |
| 4. | Doolittle, Sean | (nycubsfan) | Chicago Cubs | 61 |
| 5. | Romo, Vicente | (jpcortez) | Mid-Century Moderns | 61 |
| 6. | Percival, Troy | (plpl512) | Montreal Expos | 60 |
| 7. | Kimbrel, Craig | (dunroche) | Nevada Racin' Rebels | 60 |
| 8. | Uehara, Koji | (dunroche) | South Texas Killer Bees | 60 |
| 9. | Wagner, Billy | (dunroche) | Nevada Racin' Rebels | 59 |
| 10. | Romo, Vicente | (Travdaddg23) | Herky Spulunkters | 59 |
| 11. | Street, Huston | (dunroche) | Boston Thunderbolts | 59 |
| 12. | Betances, Dellin | (filler) | Turner Bulldogs | 59 |
| 13. | Adams, Mike | (bigror25) | Canarsie Cannibals | 59 |
| 14. | Adams, Mike | (dunroche) | New York Knights | 59 |
| 15. | Feliz, Neftali | (dunroche) | Washington Angry Ducks | 59 |
| 16. | Feliz, Neftali | (dunroche) | Nevada Racin' Rebels | 59 |
| 17. | Putz, J.J. | (iceman18) | New York Mets | 58 |
| 18. | McDaniel, Lindy | (Dmurphy) | Luxor Attack | 58 |
| 19. | Doolittle, Sean | (dunroche) | Nevada Racin' Rebels | 58 |
| 20. | Chapman, Aroldis | (hitter) | Nashville Knights | 58 |
| 21. | Nathan, Joe | (kingstreet) | Singapore Slingers | 57 |
| 22. | Street, Huston | (super) | High Desert Dead Possums | 57 |
| 23. | Betancourt, Rafael | (Carnivores) | Shanghai Maggots | 57 |
| 24. | Eichhorn, Mark | (michelb3514) | Iowa Corn Pickers | 57 |
| 25. | Doolittle, Sean | (joemcg) | OC Wolves | 57 |
| 26. | Gagne, Eric | (nycubsfan) | NYC Cubbies | 57 |
| 27. | Doolittle, Sean | (Joemcg) | OC Bulldogs | 57 |
| 28. | Gossage, Rich | (Horsehide) | Midland RockHounds | 57 |
| 29. | Eichhorn, Mark | (JohnMardis) | Warner Town Animaniacs | 57 |
| 30. | Kimbrel, Craig | (dunroche) | New York Knights | 57 |
| 31. | Abernathy, Ted | (babyave1) | Loudoun Lassos | 57 |
| 32. | Wagner, Billy | (nycubsfan) | Goshen Gorillas | 57 |
| 33. | Jansen, Kenley | (Daver) | Miami Dark Stars | 57 |
| 34. | Gagne, Eric | (Chapman) | Derry Fear | 56 |
| 35. | Papelbon, Jonathan | (Lostit) | Chicago Lost Cubs | 56 |
| 36. | Uehara, Koji | (Daver) | Miami Dark Stars | 56 |
| 37. | Gossage, Rich | (goingyard) | Iowa Spank’sters | 56 |
| 38. | Gagne, Eric | (dunroche) | Washington Racin' Rebels | 56 |
| 39. | Benoit, Joaquin | (dunroche) | Nevada Racin' Rebels | 56 |
| 40. | Gagne, Eric | (Gaberino) | Sin City High Rollers | 56 |
| 41. | Drabowsky, Moe | (babyave1) | Loudoun Lassos | 56 |
| 42. | Feliz, Neftali | (dunroche) | Carolina Racin' Wrens | 56 |
| 43. | Feliz, Neftali | (dzach) | McMillan Flow | 56 |
| 44. | Eckersley, Dennis | (nycubsfan) | Chicago Cubbies | 56 |
| 45. | Wilhelm, Hoyt | (LDJS1947) | BROOKLYN DODGERS | 56 |
| 46. | Jansen, Kenley | (tgbbirch) | Quincy Jets | 56 |
| 47. | Doolittle, Sean | (nycubsfan) | American Pharoahs | 56 |
| 48. | Chapman, Aroldis | (sheikyerboudi) | Weesles Ripped My Flesh | 56 |
| 49. | Green, Chad | (mattholland1975) | Marathon Red Dragons | 56 |
| 50. | Madson, Ryan | (Graphixcat) | Covington Conquerors | 56 |