Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (Slugging)
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. | Bonds, Barry | Chippewa Park Tribe | .877 | |
| 2. | Olson, Matt | (dgeorgi) | GAS HOUSE DIZZY n DAFFY | .850 |
| 3. | Bonds, Barry | (richgibson) | San Diego WOBS | .838 |
| 4. | Bonds, Barry | (wheat23) | Long Island Bucks | .835 |
| 5. | Bonds, Barry | (roguerouge) | Cape Town Prawns | .828 |
| 6. | Bonds, Barry | Nassau’s Michael G | .818 | |
| 7. | Ruth, Babe | (Moonfish) | Boston BOOTLEGGERS | .817 |
| 8. | Bonds, Barry | (MJR) | South Side Chicago Fire and Rescue | .817 |
| 9. | Bonds, Barry | (Zigwiggity) | Tisdale Jumping Frogs | .815 |
| 10. | Bonds, Barry | (Rosilver) | South Dakota Suns | .813 |
| 11. | McGwire, Mark | (gt049) | Cleveland Naps | .811 |
| 12. | Bonds, Barry | (Majestic44) | Honolulu Hooters | .808 |
| 13. | Bonds, Barry | (dbutts) | South Dakota Farewells | .805 |
| 14. | Bonds, Barry | (ginkster) | Las Vegas Luckys | .804 |
| 15. | Gallo, Joey | BB Bums | .803 | |
| 16. | Bonds, Barry | (WorcWarr) | Worcester Warriors | .803 |
| 17. | Bonds, Barry | (sytsmab) | Beantown Bees | .800 |
| 18. | Bonds, Barry | (Charlie22) | Glacier Peaks | .798 |
| 19. | Ruth, Babe | (Doceagle) | Kansas City Monarchs | .794 |
| 20. | Bonds, Barry | Boston NightHawks | .793 | |
| 21. | Bonds, Barry | (littlereb) | Apple Valley Apes | .792 |
| 22. | Acuna, Ronald | (joemcg) | OC Panthers | .792 |
| 23. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .792 |
| 24. | Bonds, Barry | (Willy1717) | Middle Earth White Walkers | .791 |
| 25. | Bonds, Barry | (mckarcher) | Emerald City Archers | .791 |
| 26. | Bonds, Barry | (Zigwiggity) | Tisdale Jumping Frogs | .791 |
| 27. | Bonds, Barry | (Artinshki) | Minnesota Charlie Browns | .791 |
| 28. | Gehrig, Lou | (Fungoking) | Big Pines Baseball Team | .790 |
| 29. | Gallo, Joey | (Bluesig) | Barañaque Black Ocelots | .790 |
| 30. | Gallo, Joey | Tom bed | .788 | |
| 31. | Bonds, Barry | (Myunclepunk) | Chicago Spirit | .788 |
| 32. | Hoskins, Rhys | (Bluesig) | Warihatag Wolves | .788 |
| 33. | McGwire, Mark | (disturbed) | Atlanta Braves | .788 |
| 34. | Bonds, Barry | (TPLball) | Chicago Baby Bears | .786 |
| 35. | Gallo, Joey | (Trashfactory) | Haven Village Spartans | .786 |
| 36. | McGwire, Mark | (juniormorales) | Seattle Sockeye | .785 |
| 37. | Bonds, Barry | (jeter0296) | Freehold LBC | .784 |
| 38. | Bonds, Barry | Portland Drumsticks | .784 | |
| 39. | Bonds, Barry | Brooklyn Knights | .782 | |
| 40. | Bonds, Barry | San Antonio Missions | .782 | |
| 41. | Bonds, Barry | (jpcortez) | Cooperstown Poodles | .782 |
| 42. | Ruth, Babe | (moxie) | Philly Classic | .781 |
| 43. | Olson, Matt | (Strider99) | Philadelphia Wyverns | .780 |
| 44. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .780 |
| 45. | Bagwell, Jeff | (jeter0296) | Freehold Woodpeckers | .780 |
| 46. | Ruth, Babe | (tbandit1) | Baltimore Killer Bees | .778 |
| 47. | Bonds, Barry | (dynasty) | Ithaca Bombers | .778 |
| 48. | Voit, Luke | (jamesoIII) | Santa Monica Snot Pickers | .777 |
| 49. | Belt, Brandon | (Mariners10) | Sarasota Sharks | .777 |
| 50. | O'Hearn, Ryan | (Don55) | BB Beavers | .777 |