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 | (filler) | Manchester Marauders | 0.52 |
| 2. | Chapman, Aroldis | (dunroche) | Washington Racin' Rebels | 0.54 |
| 3. | Saito, Takashi | (paranoid) | Las Vegas Pit Bosses | 0.55 |
| 4. | Marmol, Carlos | (Caphowdy504) | Springfield Troy McClures | 0.57 |
| 5. | Wagner, Billy | (WorcWarr) | Worcester Warriors | 0.57 |
| 6. | Chapman, Aroldis | (nycubsfan) | Htown Skeeters | 0.57 |
| 7. | Rivera, Mariano | (filler) | New York Pandas | 0.57 |
| 8. | Adams, Mike | (BAR23) | Bucheon Everglow | 0.57 |
| 9. | Rivera, Mariano | (paranoid) | Las Vegas Scorpions | 0.58 |
| 10. | Hader, Josh | (ThEiRoNhOrSe04) | Hoboken Zephyrs | 0.58 |
| 11. | Soriano, Rafael | (rfb60609) | Camp Hill Suburbanites | 0.58 |
| 12. | Uehara, Koji | (Kaline65) | Rochester RHINO | 0.59 |
| 13. | Jackson, Mike | (nmiller4) | Cincinnati Reds | 0.60 |
| 14. | Gagne, Eric | (bdavids28) | Silver Jet | 0.60 |
| 15. | Hall, Dick | (Tatousec56) | Montreal Expos | 0.60 |
| 16. | Adams, Mike | (paranoid) | The Meadows CaballerosDeOro | 0.60 |
| 17. | Hoffman, Jeff | (BlueJays2) | New York Metropolitans | 0.60 |
| 18. | Kimbrel, Craig | (mattholland1975) | Clearwater Crocs | 0.60 |
| 19. | Kimbrel, Craig | (richgibson) | Parma FROGGIES | 0.61 |
| 20. | Rivera, Mariano | (Mrploppie) | Oakmont Hopefuls | 0.61 |
| 21. | Smoltz, John | (finalbody) | Honolulu Sharks | 0.61 |
| 22. | Henke, Tom | (gibblets1973) | Torbay Tides | 0.61 |
| 23. | Doolittle, Sean | (Vernorama) | Jackson Jays | 0.61 |
| 24. | Adams, Mike | (dynasty) | Forest City Owls | 0.61 |
| 25. | Adams, Mike | (bostontex24) | Boston Commons | 0.62 |
| 26. | Wagner, Billy | (Abcjz) | Tottenville Pirates | 0.62 |
| 27. | Gagne, Eric | (bdavids28) | Greasy Jungle | 0.62 |
| 28. | Gagne, Eric | (Crackpot) | Boston Muff Pounders | 0.62 |
| 29. | Kimbrel, Craig | (MikeDrop0221) | Macon Apes | 0.62 |
| 30. | Hader, Josh | (Snowman33) | Sun City Islanders | 0.62 |
| 31. | Gagne, Eric | (dynasty8) | Dot Com | 0.62 |
| 32. | Graveman, Kendall | (Nuroc) | One Man Tribe | 0.62 |
| 33. | McGraw, Tug | (rowdy1982) | Seven of Nine | 0.63 |
| 34. | Adams, Mike | (gibblets1973) | Mount Pearl Marauders | 0.63 |
| 35. | Balfour, Grant | (zigwiggity) | Chittenango Bears | 0.63 |
| 36. | Doolittle, Sean | (maverck11) | West Park Panthers | 0.63 |
| 37. | Uehara, Koji | (ranger) | DEER PARK DEER | 0.63 |
| 38. | Devine, Joey | (bdavids28) | Escape From The Bronx | 0.63 |
| 39. | Giles, Ken | (tgbsbl1967) | Minot Minotaurs | 0.63 |
| 40. | Uehara, Koji | (mattholland1975) | Homestead Smokestacks | 0.63 |
| 41. | Sewald, Paul | (Epitome31) | Laredo Lemurs | 0.63 |
| 42. | Street, Huston | (richp) | Wandering Wolverines | 0.63 |
| 43. | Jackson, Mike | (filler) | Manchester Marauders | 0.63 |
| 44. | Adams, Mike | (nycubsfan) | JACKSON HEIGHTS SHARKS | 0.63 |
| 45. | Wilhelm, Hoyt | (liddlefeat) | Raritan Retrievers | 0.63 |
| 46. | Chapman, Aroldis | (chaaad) | New York Bluebirds | 0.64 |
| 47. | Doolittle, Sean | (marknym) | Absolutely Perfect | 0.64 |
| 48. | Eckersley, Dennis | (bnewman58) | New Jack City Miscreants | 0.64 |
| 49. | Uehara, Koji | (kevin0gonzales) | Las Vegas Liches | 0.64 |
| 50. | Sutter, Bruce | (Cg4177) | Pittsburgh Pachyderms | 0.64 |
