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 | (roguerouge) | Cape Town Prawns | .828 |
| 2. | Bonds, Barry | (Copp26) | Emporium Spiders | .825 |
| 3. | Bonds, Barry | (mickey7) | Quantrill Raiders | .818 |
| 4. | Ruth, Babe | (Gaberino) | Columbia Lions | .817 |
| 5. | Bonds, Barry | (Bigjoe52) | Jersey City Dire Wolves | .817 |
| 6. | Bonds, Barry | (Trulaia) | Tuchen Patriots | .817 |
| 7. | Bonds, Barry | (cornliquor) | Alabama Abominations | .816 |
| 8. | Bonds, Barry | (sgt714) | Boston Americans | .813 |
| 9. | Bonds, Barry | (jericho2u) | Zadoc Starblazers | .808 |
| 10. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .806 |
| 11. | Bonds, Barry | (in_2_it_2) | Inland Empire 66ers | .805 |
| 12. | Bonds, Barry | (WorcWarr) | Worcester Warriors | .803 |
| 13. | Bonds, Barry | (Darkmoon) | Columbus Braves | .802 |
| 14. | Bonds, Barry | (littlereb) | Shallotte Saber Cats | .800 |
| 15. | Bonds, Barry | (wileydog97) | Chicago Dragons | .799 |
| 16. | Bonds, Barry | (Charlie22) | Glacier Peaks | .798 |
| 17. | Bonds, Barry | (moosejaa) | Stockton Stars | .797 |
| 18. | Gehrig, Lou | (Littlepadre) | San Francisco Seals | .794 |
| 19. | Ruth, Babe | (Whg383) | Jacksonville Tricky Cats | .794 |
| 20. | Bonds, Barry | (iamcota) | Rockingham Renegados | .793 |
| 21. | Bonds, Barry | (smoussette12) | Boston NightHawks | .793 |
| 22. | Ruth, Babe | (Warrior) | Miami Dolphins | .791 |
| 23. | Bonds, Barry | (in_2_it_2) | Inland Empire 66ers | .791 |
| 24. | Bonds, Barry | Neon Icons | .791 | |
| 25. | Bonds, Barry | (Slippingjimmy) | Chittenango Wizards of Oz | .791 |
| 26. | Gehrig, Lou | (teamkev24) | Oakland Oaks | .790 |
| 27. | Ruth, Babe | (urbancowboy) | Surprise Arizona Partiers | .790 |
| 28. | Gallo, Joey | (Bluesig) | Barañaque Black Ocelots | .790 |
| 29. | Bonds, Barry | (Myunclepunk) | Chicago Spirit | .788 |
| 30. | McGwire, Mark | (kingstreet) | Singapore Dragons | .788 |
| 31. | Bonds, Barry | (Bears19) | Erie Fighters | .787 |
| 32. | Gallo, Joey | (allup8679) | The Dangerous Alliance | .786 |
| 33. | Bonds, Barry | (morrisjm1975) | Dc Bees | .785 |
| 34. | Olson, Matt | (mattholland1975) | Spring Arbor Stallions | .785 |
| 35. | Bonds, Barry | (chapman) | Huntington Hawks | .784 |
| 36. | Bonds, Barry | (pamash07) | Portland Drumsticks | .784 |
| 37. | Bonds, Barry | (ClassicOs) | Baltimore Orioles | .782 |
| 38. | Bonds, Barry | (kds4316) | San Antonio Missions | .782 |
| 39. | Bonds, Barry | (jpcortez) | Cooperstown Poodles | .782 |
| 40. | Bonds, Barry | (Jrobandsteal) | Pasadena Cowpokes | .781 |
| 41. | Ruth, Babe | (Artinshki) | Anytown Sluggers | .781 |
| 42. | Bonds, Barry | (Pop) | Carolina Waves | .780 |
| 43. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .780 |
| 44. | Bagwell, Jeff | (Artinshki) | Boston Bees | .780 |
| 45. | Bagwell, Jeff | (Mortamar1966) | Ridge Harbor Lead Bellies | .779 |
| 46. | Bonds, Barry | (super) | Adirondack Sluggers | .779 |
| 47. | Ruth, Babe | (Thanks4playing) | GRAND INQUISITORS | .778 |
| 48. | Voit, Luke | (louisfelix) | Bilbao Bulls | .778 |
| 49. | Bonds, Barry | (andrewclovell) | Ithaca Bombers | .778 |
| 50. | Voit, Luke | (Trilling) | Westlake Village Tanks | .777 |