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. | Broxton, Jonathan | (Artinshki) | B Bonds Bombers | 0.00 |
| 2. | Street, Huston | (Bishop48) | Ft. Worth Cats | 0.00 |
| 3. | Papelbon, Jonathan | (nycubsfan) | San Antonio Texans | 0.00 |
| 4. | D'Acquisto, John | (829er) | Potomac Poison | 0.00 |
| 5. | Britton, Zach | (leeslegends) | East County Devil Dogs | 0.00 |
| 6. | Putz, J.J. | (chaaad) | Schenectady Mohawk Giants | 0.19 |
| 7. | Howell, J.P. | (sgt714) | Boston Red Sox | 0.21 |
| 8. | Vande Berg, Ed | (pentucket80) | Briscoe Heights Blockheads | 0.22 |
| 9. | Lancaster, Les | (Lostit) | Chicago's Lost Cubs 1 | 0.22 |
| 10. | Upshaw, Cecil | (andyczi) | Denver NC Groundhogs | 0.23 |
| 11. | Burke, Tim | (Wileydog97) | Raleigh Top Hats | 0.24 |
| 12. | Shaw, Jeff | (rowdy1982) | Terre Haute Pterodactyls | 0.24 |
| 13. | Karinchak, James | (dzach) | Time Variance Authority | 0.24 |
| 14. | Barnes, Matt | (Trulaia) | Quicken Dirty | 0.24 |
| 15. | Bell, Heath | (SilverSteel34) | Lake Jackson Astros | 0.24 |
| 16. | Balfour, Grant | (Mattholland1975) | Chicago Bears | 0.25 |
| 17. | Aardsma, David | (tribetime89) | Boston Bees | 0.25 |
| 18. | Lincecum, Tim | (timnara1) | OBX Tigers | 0.25 |
| 19. | Howell, Harry | (Shpennymons) | Oyster Bay Eagles | 0.26 |
| 20. | Chapman, Aroldis | (CornLiquor) | Jenkinstown Jameson | 0.26 |
| 21. | Dibble, Rob | (Casey_Stengel37) | Calgary Corsairs | 0.26 |
| 22. | Britton, Zach | (rreebe916) | RED Fighters | 0.26 |
| 23. | Putz, J.J. | (paranoid) | Las Vegas Lounge Lizards | 0.26 |
| 24. | Worrell, Tim | (sammy-z) | Las Vegas Aces of Bases | 0.27 |
| 25. | Papelbon, Jonathan | (skooler1) | Dallas Cowboys | 0.27 |
| 26. | Ellis, Sammy | Carolina Copperheads | 0.27 | |
| 27. | Betances, Dellin | (HaloFire) | Staten Island Skulls | 0.28 |
| 28. | Jansen, Kenley | (jcvlach) | Chicago Reapers | 0.28 |
| 29. | Cooper, Mort | (JohnHeidy) | Loretto Leprechauns | 0.29 |
| 30. | Neris, Hector | (gr33nappleboy) | Tennessee Dragons | 0.29 |
| 31. | Wagner, Billy | (filler8) | New Team | 0.30 |
| 32. | Valverde, Jose | (plpl512) | Montreal Machine | 0.33 |
| 33. | Kuo, Hong-Chih | (Artinshki) | B Bonds Bombers | 0.34 |
| 34. | Nelson, Joe | (sammy-z) | Tuscan Beggars | 0.36 |
| 35. | Diaz, Edwin | (markphip) | Monadnock Maulers | 0.39 |
| 36. | Hader, Josh | (PalinJames) | Erie Cajuns | 0.39 |
| 37. | Broxton, Jonathan | (filler2) | Chicago Frisbees | 0.41 |
| 38. | Miller, Andrew | (nycubsfan) | Jackson Heights Nittany Lions | 0.43 |
| 39. | Pagan, Emilio | (LDJS1947) | MISSOURI TIGERS | 0.42 |
| 40. | Devine, Joey | RED Sneakers | 0.44 | |
| 41. | Sutter, Bruce | (BamaTrashman) | Tampico Stogies | 0.43 |
| 42. | Broxton, Jonathan | (Sabotage) | Illinois F'n Sabotage | 0.44 |
| 43. | Betances, Dellin | (chaaad) | FCL Yankees | 0.44 |
| 44. | Burns, Todd | (Theo_smith) | Ithaca Rhinos | 0.46 |
| 45. | Charlton, Norm | (itchy008) | Captain Supemarket | 0.47 |
| 46. | Devine, Joey | (skooler1) | New York Highlanders | 0.47 |
| 47. | Parker, Blake | (hanson) | Stockton Stars | 0.47 |
| 48. | Chapman, Aroldis | (Sidneypointers) | Urbana Five-o | 0.47 |
| 49. | Sanders, Ken | (PicklePunk20) | Kenora Thistles | 0.48 |
| 50. | Betances, Dellin | (richardcranium) | Sierra Nevada Quicksilvers | 0.48 |