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. | Olson, Matt | GAS HOUSE DIZZY n DAFFY | .850 | |
| 2. | Bonds, Barry | (richgibson) | San Diego WOBS | .838 |
| 3. | Bonds, Barry | (PifLit) | Kansas City Royals | .835 |
| 4. | Bonds, Barry | (roguerouge) | Cape Town Prawns | .828 |
| 5. | Bonds, Barry | (timyoung) | PIttsburgh Crawfords | .818 |
| 6. | Ruth, Babe | (gr33nappleboy) | Shipwreck Vikings | .817 |
| 7. | Bonds, Barry | (mac66) | SouthSide Mavericks | .817 |
| 8. | Bonds, Barry | (acr0320) | Tisdale Jumping Frogs | .815 |
| 9. | McGwire, Mark | (ryno42) | SF Demons | .811 |
| 10. | Bonds, Barry | (broles) | Bloomington Blue Bombers | .806 |
| 11. | Bonds, Barry | (Moosejaa) | Heritage Pointers | .805 |
| 12. | Bonds, Barry | (ginkster) | Las Vegas Luckys | .804 |
| 13. | Gallo, Joey | (Trulaia) | CC Cats | .803 |
| 14. | Bonds, Barry | (WorcWarr) | Worcester Warriors | .803 |
| 15. | Soto, Juan | (Don55) | CC Cuties | .800 |
| 16. | Hoskins, Rhys | (michelb3514) | Iowa Corn Pickers | .799 |
| 17. | Bonds, Barry | (filler) | Iowa Tractors | .793 |
| 18. | Bonds, Barry | Apple Valley Apes | .792 | |
| 19. | Acuna, Ronald | (joemcg) | OC Panthers | .792 |
| 20. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .792 |
| 21. | Bonds, Barry | (mckarcher) | Emerald City Archers | .791 |
| 22. | Bonds, Barry | (acr0320) | Tisdale Jumping Frogs | .791 |
| 23. | Bonds, Barry | (Artinshki) | Minnesota Charlie Browns | .791 |
| 24. | Gallo, Joey | (Bluesig) | Barañaque Black Ocelots | .790 |
| 25. | Gallo, Joey | (rickmc) | Northwest Timberwolves | .788 |
| 26. | Hoskins, Rhys | (cosmicbball) | Warihatag Wolves | .788 |
| 27. | McGwire, Mark | (wileydog97) | Raleigh Red Devils | .788 |
| 28. | Bonds, Barry | (wileydog97) | Raleigh Sharks | .786 |
| 29. | Gallo, Joey | (Trashfactory) | Haven Village Spartans | .786 |
| 30. | McGwire, Mark | (tjm) | Seattle Sockeye | .785 |
| 31. | Acuna, Ronald | (mbeiser9999) | Maryville Bass | .784 |
| 32. | Bonds, Barry | (Tiger123) | Portland Drumsticks | .784 |
| 33. | Bonds, Barry | (GLOBEXcorp) | GLOBEX Corporation | .782 |
| 34. | Ruth, Babe | (JohnHeidy) | Bisbee Bees | .781 |
| 35. | Smith, Will | (donnpall) | Las Vegas Sun Sox | .781 |
| 36. | Bonds, Barry | (davengmusic) | Auckerman Descendants | .780 |
| 37. | Olson, Matt | Philadelphia Wyverns | .780 | |
| 38. | Bagwell, Jeff | (ThEiRoNhOrSe04) | Freehold Woodpeckers | .780 |
| 39. | Ruth, Babe | (tbandit1) | Baltimore Killer Bees | .778 |
| 40. | Bonds, Barry | (sgt714) | Boston Red Sox | .777 |
| 41. | Belt, Brandon | (mcvn4) | Carpool Champions | .777 |
| 42. | Bonds, Barry | (broles) | Bloomington Blue Bombers | .776 |
| 43. | Bonds, Barry | (noleary) | Baltimore Giants | .776 |
| 44. | Bonds, Barry | (Trulaia) | Revenge of Samson | .776 |
| 45. | Hoskins, Rhys | (cosmicbball) | Warihatag Wolves | .776 |
| 46. | Bonds, Barry | (Artinshki) | Minnesota Charlie Browns | .775 |
| 47. | Voit, Luke | (ColinBoucher) | Derelict Winos | .775 |
| 48. | Bonds, Barry | (paranoid) | Las Vegas Liches | .775 |
| 49. | Bonds, Barry | (TDog712) | D’Hanis Tornado | .774 |
| 50. | Bonds, Barry | (bfstevens) | Catoctin Creeks | .774 |