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 | (walle-1) | Washington Racin' Rebels | 0.54 |
| 3. | Street, Huston | (nycubsfan) | Goshen Gorillas | 0.55 |
| 4. | Saito, Takashi | (richgibson) | MK ULTRAS | 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 | (MikeDrop0221) | New York Pandas | 0.57 |
| 9. | Adams, Mike | (richgibson) | Free LUIGIS | 0.57 |
| 10. | Rivera, Mariano | (richgibson) | Raj CounterSPIES | 0.58 |
| 11. | Hader, Josh | (ThEiRoNhOrSe04) | Hoboken Zephyrs | 0.58 |
| 12. | Soriano, Rafael | (Swingindave) | LITTLE ROCK RAIDERS | 0.58 |
| 13. | Uehara, Koji | (Artinshki) | Minnesota Charlie Browns | 0.59 |
| 14. | Adams, Mike | (nycubsfan) | Chicago Cubs | 0.59 |
| 15. | Jackson, Mike | (nmiller4) | Cincinnati Reds | 0.60 |
| 16. | Gagne, Eric | (bdavids28) | Silver Jet | 0.60 |
| 17. | Hall, Dick | (Theo_smith) | East Nashville Vinyl | 0.60 |
| 18. | Adams, Mike | (Saints69) | Detroit Red Devil’s | 0.60 |
| 19. | Hoffman, Jeff | (Sportsgeek) | Podunk Podcasters | 0.60 |
| 20. | Kimbrel, Craig | (thadjhall) | Manhattan Darts QD5 | 0.60 |
| 21. | Kimbrel, Craig | (Artinshki) | Base Ball Homers | 0.61 |
| 22. | Rivera, Mariano | (rreebe916) | Pensacola Flyers | 0.61 |
| 23. | Henke, Tom | (gibblets1973) | Torbay Tides | 0.61 |
| 24. | Smoltz, John | (KOOGS) | San Antonio Mustangs | 0.61 |
| 25. | Doolittle, Sean | (hayzess) | Raleigh Jays | 0.61 |
| 26. | Adams, Mike | (filler8) | Memphis Dragons | 0.61 |
| 27. | Adams, Mike | (bostontex24) | Boston Commons | 0.62 |
| 28. | Wagner, Billy | (finalbody) | Tottenville Pirates | 0.62 |
| 29. | Gagne, Eric | (bdavids28) | Greasy Jungle | 0.62 |
| 30. | Gagne, Eric | (Storytelling4) | Boston Red Bulls | 0.62 |
| 31. | Kimbrel, Craig | Raleigh Apes | 0.62 | |
| 32. | Eckersley, Dennis | (infmusxp) | Smokehouse Smokies | 0.62 |
| 33. | Hader, Josh | (Snowman33) | Chattanooga Snowmen | 0.62 |
| 34. | Gagne, Eric | (filler) | Smithville Simulacrums | 0.62 |
| 35. | Graveman, Kendall | (dynasty8) | Bingo Long'S All Stars | 0.62 |
| 36. | McGraw, Tug | (Seavericious) | Cambridge Mets | 0.63 |
| 37. | Adams, Mike | (gibblets1973) | Mount Pearl Marauders | 0.63 |
| 38. | Balfour, Grant | (Wileydog97) | Raleigh Wildcats | 0.63 |
| 39. | Doolittle, Sean | (maverck11) | West Park Panthers | 0.63 |
| 40. | Uehara, Koji | (ranger) | DEER PARK DEER | 0.63 |
| 41. | Devine, Joey | (bdavids28) | Escape From The Bronx | 0.63 |
| 42. | Giles, Ken | (walle-1) | Jonesville Spiders | 0.63 |
| 43. | Uehara, Koji | (mattholland1975) | Homestead Smokestacks | 0.63 |
| 44. | Sewald, Paul | (GOPADRES) | Anaheim Angels | 0.63 |
| 45. | Street, Huston | (richp) | Wandering Wolverines | 0.63 |
| 46. | Jackson, Mike | (Artinshki) | Minnesota Charlie Browns | 0.63 |
| 47. | Adams, Mike | (nycubsfan) | JACKSON HEIGHTS SHARKS | 0.63 |
| 48. | Wilhelm, Hoyt | (walle-1) | Raritan Retrievers | 0.63 |
| 49. | Chapman, Aroldis | (chaaad) | New York Bluebirds | 0.64 |
| 50. | Doolittle, Sean | (marknym) | Chattanooga Chimichangas | 0.64 |
