Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (WHIP)
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. | Jansen, Kenley | (Artinshki) | Minnesota Charlie Browns | 0.52 |
| 2. | Chapman, Aroldis | (rlapierre) | Iowa Corncobbs | 0.54 |
| 3. | Street, Huston | (nycubsfan) | Goshen Gorillas | 0.55 |
| 4. | Saito, Takashi | (Mrploppie) | Pittsburgh Plunder | 0.55 |
| 5. | Marmol, Carlos | (Caphowdy504) | Springfield Troy McClures | 0.57 |
| 6. | Chapman, Aroldis | (nycubsfan) | Htown Skeeters | 0.57 |
| 7. | Wagner, Billy | (WorcWarr) | Worcester Warriors | 0.57 |
| 8. | Rivera, Mariano | (rlapierre) | Bad Dude Corn pop | 0.57 |
| 9. | Adams, Mike | (filler) | Louisiana Gators | 0.57 |
| 10. | Rivera, Mariano | (RichGibson) | Flying SPAGHETTI MONSTERS | 0.58 |
| 11. | Hader, Josh | (ThEiRoNhOrSe04) | Hoboken Zephyrs | 0.58 |
| 12. | Soriano, Rafael | (RichGibson) | Detroit BRONX BAR MAGIC RABBITS | 0.58 |
| 13. | Wagner, Billy | (befulton) | Old Dogs | 0.59 |
| 14. | Uehara, Koji | (Artinshki) | Minnesota Charlie Browns | 0.59 |
| 15. | Adams, Mike | (nycubsfan) | Chicago Cubs | 0.59 |
| 16. | Jackson, Mike | (dom1134157) | Miami Serpents | 0.60 |
| 17. | Gagne, Eric | (bdavids28) | Silver Jet | 0.60 |
| 18. | Hall, Dick | (theo_smith) | East Nashville Vinyl | 0.60 |
| 19. | Adams, Mike | (filler8) | Denver Eagles | 0.60 |
| 20. | Hoffman, Jeff | Denver Eagles | 0.60 | |
| 21. | Kimbrel, Craig | (Crackpot) | Seattle Sloths | 0.60 |
| 22. | Kimbrel, Craig | (Artinshki) | Base Ball Bambinos | 0.61 |
| 23. | Rivera, Mariano | (richp) | Pensacola Flyers | 0.61 |
| 24. | Rivera, Mariano | (mdmatheson) | Clovis Hitmen | 0.61 |
| 25. | Doolittle, Sean | (chaaad) | LIU Sharks | 0.61 |
| 26. | Doolittle, Sean | (Wileydog97) | Raleigh Wizards | 0.61 |
| 27. | Henke, Tom | (gibblets1973) | Torbay Tides | 0.61 |
| 28. | Smoltz, John | (KOOGS) | San Antonio Mustangs | 0.61 |
| 29. | Adams, Mike | (filler8) | Atlanta Gorillas | 0.61 |
| 30. | Adams, Mike | (dynasty) | Boston Bees | 0.62 |
| 31. | Wagner, Billy | (aj082) | Harvard Home Wreckers | 0.62 |
| 32. | Gagne, Eric | (bdavids28) | Greasy Jungle | 0.62 |
| 33. | Gagne, Eric | (Wolfmike) | Raleigh Tree Huggers | 0.62 |
| 34. | Kimbrel, Craig | (filler8) | Texas Outlaws | 0.62 |
| 35. | Eckersley, Dennis | (jaredhamann) | Raleigh Foxes | 0.62 |
| 36. | Hader, Josh | (Snowman33) | Chattanooga Snowmen | 0.62 |
| 37. | Gagne, Eric | (KCRockies) | Kansas Greenbacks | 0.62 |
| 38. | Wagner, Billy | (finalbody) | Pittsburgh Plunder | 0.62 |
| 39. | Graveman, Kendall | (filler) | Kentucky Horses | 0.62 |
| 40. | McGraw, Tug | (filler) | Toronto Tigers | 0.63 |
| 41. | Adams, Mike | (gibblets1973) | Mount Pearl Marauders | 0.63 |
| 42. | Balfour, Grant | (filler8) | Texas Outlaws | 0.63 |
| 43. | Doolittle, Sean | (maverck11) | West Park Panthers | 0.63 |
| 44. | Uehara, Koji | (Babadude88) | Morgantown Miners | 0.63 |
| 45. | Devine, Joey | (dynasty) | Portland Vikings | 0.63 |
| 46. | Giles, Ken | (filler) | Utah Nightmares | 0.63 |
| 47. | Uehara, Koji | (mattholland1975) | Homestead Smokestacks | 0.63 |
| 48. | Sewald, Paul | (dynasty) | Florida Crabs | 0.63 |
| 49. | Street, Huston | (richp) | Wandering Wolverines | 0.63 |
| 50. | Jackson, Mike | (Artinshki) | Minnesota Charlie Browns | 0.63 |
