Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Wins)
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. | Green, Chad | San Diego Suns | 39 | |
| 2. | Hader, Josh | (bigalroulo) | West Michigan Whitecaps | 36 |
| 3. | Treinen, Blake | (habsco) | Tampa Terror | 34 |
| 4. | Leclerc, Jose | (mbtmje11) | Howard Hulks | 34 |
| 5. | Castillo, Jose | (utwoody) | Staten Island Ferries | 33 |
| 6. | Dominguez, Seranthony | (Dwayne323) | Tulsa I__I UnionRedskins2 | 33 |
| 7. | Hader, Josh | (Hendu42) | Kim Walruses | 32 |
| 8. | Kelley, Shawn | (RyanSTL) | Tulsa I__I UnionRedskins1 | 32 |
| 9. | Leclerc, Jose | (artisrutledge) | Portland Lumberjacks | 31 |
| 10. | Green, Chad | (RitzCards2) | Saddam's WMDs VII | 31 |
| 11. | Ford, Russ | (Dollarhotdog) | Sly Old Fox | 31 |
| 12. | Martinez, Pedro | (broles) | Florida Yellow Jackets | 31 |
| 13. | Santana, Johan | (broles) | Florida Yellow Jackets | 30 |
| 14. | Dominguez, Seranthony | (Majestic44) | Salt lake Dragons | 30 |
| 15. | Green, Chad | New York Yankees | 30 | |
| 16. | Martinez, Pedro | (kingstreet) | Singapore Slingers | 29 |
| 17. | Strasburg, Stephen | (hoopdirt) | Pittsburgh Parrots | 29 |
| 18. | Drysdale, Don | (ClassicOs) | Baltimore Orioles | 29 |
| 19. | Gooden, Dwight | (Consigliere33) | Cleveland Indians | 29 |
| 20. | Scott, Mike | (Mike1670) | Erie Elephants | 29 |
| 21. | Maddux, Greg | Stumptown Floods | 29 | |
| 22. | Tiant, Luis | (mickey7) | Hartford Yard Goats | 29 |
| 23. | Fernandez, Sid | (kingstreet) | Singapore Straits Tigers | 29 |
| 24. | Johnson, Randy | (dalipfhrfc) | Franklin Bums | 29 |
| 25. | Smoltz, John | (ClassicOs) | Baltimore Orioles | 28 |
| 26. | McNally, Dave | (tgbbirch) | Branch County Frogs | 28 |
| 27. | Johnson, Randy | (Zigwiggity) | Sound of Revenge | 28 |
| 28. | Tiant, Luis | (kingstreet) | Singapore Jumbos | 28 |
| 29. | Robertson, David | (Jaws) | West Side Bucs | 28 |
| 30. | Walsh, Ed | (filler) | Bluebell Chiefs | 28 |
| 31. | Scherzer, Max | (Erwin23) | Indiana Cavemen | 28 |
| 32. | Green, Chad | (BigRedMachine90) | Beating My Snake | 28 |
| 33. | Schmidt, Jason | (tw_gk) | King of Prussia Monarchs | 28 |
| 34. | Walsh, Ed | (samwhitworth) | West Dakota Slime | 28 |
| 35. | Kershaw, Clayton | (Trulaia) | city players | 28 |
| 36. | Johnson, Walter | (Dollarhotdog) | Sly Old Fox | 28 |
| 37. | Sweeney, Charlie | (baseball4ever) | Panama Canal Builders | 28 |
| 38. | Sweeney, Charlie | (Tudda) | Gibsonia Gators | 28 |
| 39. | Cooper, Mort | (Novotny34) | Chicago Frisbees | 28 |
| 40. | Marichal, Juan | (gate-mouth) | Baltimore 💰⚾ | 28 |
| 41. | Green, Chad | (AJHawk) | Hampton Roads Neptunes | 28 |
| 42. | Johnson, Walter | (filler) | Golden State Raiders | 28 |
| 43. | Johnson, Randy | (dbutts) | Allen Park Jacks | 28 |
| 44. | Kluber, Corey | (tribetime89) | Cincinnati Redstockings | 28 |
| 45. | Kershaw, Clayton | (briansoileau) | NOLA Pelicans | 28 |
| 46. | Ottavino, Adam | (philliesphan28) | Saulsbury Sluggers | 28 |
| 47. | Ryan, Nolan | (filler) | Baltimore Chop | 28 |
| 48. | Blue, Vida | (Zeedood) | Lake Titicaca Cornholios | 28 |
| 49. | Hendricks, Kyle | (GusPC13) | Pangaea Knights | 28 |
| 50. | Lincecum, Tim | (malael) | New York Highlanders | 28 |