Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (ERA)
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. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 0.00 |
| 2. | Street, Huston | Tucson Titans | 0.00 | |
| 3. | Britton, Zach | (leeslegends) | East County Devil Dogs | 0.00 |
| 4. | Broxton, Jonathan | (Artinshki) | B Bonds Bombers | 0.00 |
| 5. | D'Acquisto, John | (829er) | Potomac Poison | 0.00 |
| 6. | Putz, J.J. | (chaaad) | Schenectady Mohawk Giants | 0.19 |
| 7. | Howell, J.P. | (sgt714) | Boston Red Sox | 0.21 |
| 8. | Lancaster, Les | (Lostit) | Chicago's Lost Cubs 1 | 0.22 |
| 9. | Vande Berg, Ed | (pentucket80) | Briscoe Heights Blockheads | 0.22 |
| 10. | Shaw, Jeff | (vanderj6993) | Steroid City Roids | 0.24 |
| 11. | Barnes, Matt | (Dark) | Quicken Dirty | 0.24 |
| 12. | Bell, Heath | (acr0320) | Lac Erie Crushers | 0.24 |
| 13. | Balfour, Grant | (Mattholland1975) | Chicago Blackhawks | 0.25 |
| 14. | Lincecum, Tim | (chaaad) | Kia Tigers | 0.25 |
| 15. | Aardsma, David | Boston Bees | 0.25 | |
| 16. | Britton, Zach | (Schvitz) | Pawtucket Suns | 0.26 |
| 17. | Dibble, Rob | (tjm) | Vermont Hilltoppers | 0.26 |
| 18. | Howell, Harry | (Shpennymons) | Oyster Bay Eagles | 0.26 |
| 19. | Chapman, Aroldis | (CornLiquor) | Jenkinstown Jameson | 0.26 |
| 20. | Putz, J.J. | (paranoid) | Las Vegas Lounge Lizards | 0.26 |
| 21. | Papelbon, Jonathan | (cfreds123) | Westside Wolves | 0.27 |
| 22. | Ellis, Sammy | (HanChaney) | Carolina Copperheads | 0.27 |
| 23. | Betances, Dellin | (HaloFire) | Heritage Pointers | 0.28 |
| 24. | Percival, Troy | (michelb3514) | Iowa Corn Pickers | 0.28 |
| 25. | Cooper, Mort | (JohnHeidy) | Loretto Rangers | 0.29 |
| 26. | Neris, Hector | (gr33nappleboy) | Tennessee Dragons | 0.29 |
| 27. | Wagner, Billy | New Team | 0.30 | |
| 28. | Nelson, Joe | (jeter0296) | Freehold Cardinals | 0.36 |
| 29. | Saito, Takashi | (super) | Fargo Freeze | 0.37 |
| 30. | Hader, Josh | (PalinJames) | Erie Cajuns | 0.39 |
| 31. | Broxton, Jonathan | (novotny34) | Chicago Frisbees | 0.41 |
| 32. | Miller, Andrew | (nycubsfan) | Jackson Heights Nittany Lions | 0.43 |
| 33. | Cormier, Rheal | (bryzzosbandits) | Chittenango Diamonds | 0.43 |
| 34. | Pagan, Emilio | (Brenzini) | Oakmont Hooks | 0.42 |
| 35. | Sutter, Bruce | (BamaTrashman) | Tampico Stogies | 0.43 |
| 36. | Miller, Andrew | (michelb3514) | Iowa Corn Pickers | 0.46 |
| 37. | Charlton, Norm | (itchy008) | Captain Supemarket | 0.47 |
| 38. | Parker, Blake | (EdwinCR) | Stockton Stars | 0.47 |
| 39. | Devine, Joey | (skooler1) | New York Highlanders | 0.47 |
| 40. | Chapman, Aroldis | (Sidneypointers) | Urbana Five-o | 0.47 |
| 41. | Sanders, Ken | (PicklePunk20) | Kenora Thistles | 0.48 |
| 42. | Betances, Dellin | (richardcranium) | Sierra Nevada Quicksilvers | 0.48 |
| 43. | Hernandez, David | (BaltimoreChop) | Hagerstown Suns | 0.48 |
| 44. | Smith, Lee | (filler8) | Edmonton Mustangs | 0.48 |
| 45. | Howry, Bob | (deyanksfan) | Elsmere Elephants | 0.48 |
| 46. | Gregerson, Luke | (shane211) | South Dakota Dolphins | 0.49 |
| 47. | Pagan, Emilio | (JoeyT2870) | Peoria Hustlers | 0.48 |
| 48. | Miller, Andrew | (jamin) | Chester Springs Menjai | 0.49 |
| 49. | Kuo, Hong-Chih | (Sabotage) | Chitown Sabotage | 0.49 |
| 50. | Hochevar, Luke | (tda81) | The Dangerous Alliance | 0.50 |