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. | Ruth, Babe | (nytkrew) | Snohomish Wolves | .865 |
| 2. | Gehrig, Lou | (stengel28) | Willoughby REDLEGS | .856 |
| 3. | Ruth, Babe | (mickey7) | San Francisco Seals | .850 |
| 4. | Ruth, Babe | (abcjz) | Baby Boys | .843 |
| 5. | Ruth, Babe | (chemball7627) | High Desert Meerkats | .837 |
| 6. | Ruth, Babe | (spw513) | Shovel Boys | .834 |
| 7. | Bonds, Barry | (kingstreet) | Singapore Slingers | .833 |
| 8. | Ruth, Babe | (PARATROOPER22) | SEVERVILLE SKULLS | .830 |
| 9. | Bonds, Barry | (infmusxp) | Woodland Big Dogs | .828 |
| 10. | Bonds, Barry | (tda81) | The Dangerous Alliance | .825 |
| 11. | Bonds, Barry | (ar2344) | Carver Crappies | .823 |
| 12. | Bonds, Barry | (hayzess) | Tuchen Patriots | .817 |
| 13. | Bonds, Barry | (sgt714) | Boston Americans | .813 |
| 14. | Bonds, Barry | (Offday) | Hometown Heroes | .812 |
| 15. | Ruth, Babe | (Bears19) | Harford County Cavemen | .810 |
| 16. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .806 |
| 17. | Bonds, Barry | (Soccerstar832) | Jersey Shore Juggernauts | .805 |
| 18. | Gehrig, Lou | Starlight City Suns | .803 | |
| 19. | Bonds, Barry | (filler) | Columbus Braves | .802 |
| 20. | Bonds, Barry | (jamin) | Chester Springs Menjai | .802 |
| 21. | Ruth, Babe | (Littlereb) | British Bull Dawgs | .801 |
| 22. | Bonds, Barry | (gbacci) | Denver Pillagers | .800 |
| 23. | Bonds, Barry | (wileydog97) | Chicago Dragons | .799 |
| 24. | Gehrig, Lou | (dynasty) | Ithaca Reds | .799 |
| 25. | Bonds, Barry | (Charlie22) | Glacier Peaks | .798 |
| 26. | Bonds, Barry | Grab Some Pine Meat | .797 | |
| 27. | Bonds, Barry | (Trulaia) | Los Angeles 24ers | .795 |
| 28. | Gehrig, Lou | (mickey7) | San Francisco Seals | .794 |
| 29. | Ruth, Babe | Riverton Buccaneers | .794 | |
| 30. | Bonds, Barry | (erfee) | SALT LAKE BEES | .794 |
| 31. | Bonds, Barry | (cubsuncfan) | Tucumcari Regal Eagles | .793 |
| 32. | Bonds, Barry | New York Highlanders | .793 | |
| 33. | Ruth, Babe | (Warrior) | Miami Dolphins | .791 |
| 34. | Bonds, Barry | (Soccerstar832) | Jersey Shore Juggernauts | .791 |
| 35. | Bonds, Barry | (Slippingjimmy) | Chittenango Wizards of Oz | .791 |
| 36. | Thomas, Frank | (Mickey7) | Lugo Bears | .791 |
| 37. | Gehrig, Lou | (nytkrew) | Snohomish Wolves | .790 |
| 38. | Ruth, Babe | (Son_of_Soul) | Surprise Arizona Partiers | .790 |
| 39. | Ruth, Babe | (Justin55) | Detroit Dollars | .789 |
| 40. | Ruth, Babe | (cunnythumber) | Beach Red Bulls | .788 |
| 41. | Bonds, Barry | (Myunclepunk) | Chicago Spirit | .788 |
| 42. | Ruth, Babe | (stengel28) | Atlanta YELLOW JACKETS | .787 |
| 43. | Bonds, Barry | (RichGibson) | Detroit Ghouls | .787 |
| 44. | Ruth, Babe | (gt049) | Providence Grays | .785 |
| 45. | Bonds, Barry | King’s Wok | .785 | |
| 46. | Olson, Matt | (Dodgers101) | Florida Yellow Jackets | .785 |
| 47. | Bonds, Barry | (JoeyT2870) | NOLA Black Cats | .783 |
| 48. | Bonds, Barry | San Antonio Missions | .782 | |
| 49. | Thome, Jim | (Trulaia) | Mataasnakahoy Mastadons | .782 |
| 50. | Bonds, Barry | (jpcortez) | Cooperstown Poodles | .782 |