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. | Schneider, Davis | Oakmont Yankees | .918 | |
| 2. | McGwire, Mark | (rreebe916) | Dixie Boy Happy Toyz | .873 |
| 3. | Carpenter, Matt | East Texas Loggers | .872 | |
| 4. | Carpenter, Matt | (doughboys) | Vegas Knights | .862 |
| 5. | Schneider, Davis | (ColinBoucher) | Relentlessly Competent | .859 |
| 6. | Carpenter, Matt | (aimcell) | Detroit Dumpsters 2 | .857 |
| 7. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 8. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 9. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 10. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 11. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 12. | Carpenter, Matt | (hanson) | Ramsey County Rampage | .851 |
| 13. | Carpenter, Matt | (LDJS1947) | NEW YORK METRO | .851 |
| 14. | Schneider, Davis | (ColinBoucher) | DoppleHead BobbleGängers | .837 |
| 15. | Carpenter, Matt | (jim2miller) | Elkhart Blue Blazers | .836 |
| 16. | Carpenter, Matt | (bwcw40) | Royal Hill Lions | .833 |
| 17. | Carpenter, Matt | (ColinBoucher) | Rancho Cucamonga Quakes | .830 |
| 18. | Carpenter, Matt | (dynasty) | Oakmont Yankees | .827 |
| 19. | Schneider, Davis | (ColinBoucher) | Mirandering Philanderers | .827 |
| 20. | Bonds, Barry | (WorcWarr) | Worcester Warriors | .826 |
| 21. | Carpenter, Matt | Atlanta Sloths | .826 | |
| 22. | Schneider, Davis | Boston Bees | .825 | |
| 23. | Hoskins, Rhys | (lasershow) | Iowa Cornhuskers | .824 |
| 24. | Schneider, Davis | (ColinBoucher) | Thago Mizers | .820 |
| 25. | Bonds, Barry | (Trulaia) | Revenge of Samson | .819 |
| 26. | Carpenter, Matt | (zrausch1) | South Park Cows | .819 |
| 27. | Carpenter, Matt | (ColinBoucher) | Bishop Sycamore HS Vagabonds | .819 |
| 28. | Carpenter, Matt | (Dieselduro) | Villa de Vagas Renegade Cholos | .818 |
| 29. | Carpenter, Matt | (bwcw40) | Seattle Serpents | .817 |
| 30. | Carpenter, Matt | (filler) | Macon Friends | .817 |
| 31. | Carpenter, Matt | Roswell Rockets | .817 | |
| 32. | Carpenter, Matt | (Charles_graf) | New York Mets | .816 |
| 33. | Carpenter, Matt | (dynasty) | Naples Mustangs | .816 |
| 34. | Carpenter, Matt | (ColinBoucher) | Hesi Pull-up Jimbos | .816 |
| 35. | Carpenter, Matt | (bwcw40) | Straw Hat Pirates | .813 |
| 36. | Carpenter, Matt | (ColinBoucher) | ‘Sota BobbleVikes | .812 |
| 37. | Carpenter, Matt | GPgg MHzz | .812 | |
| 38. | Carpenter, Matt | (dgeorgi) | STEPPIN WOLF MAGIC CARPET RIDE | .810 |
| 39. | Carpenter, Matt | (Matt11791) | Boston Brewers | .809 |
| 40. | Carpenter, Matt | (dynasty8) | LANDON LIONS | .808 |
| 41. | Carpenter, Matt | (DelBaseballFan) | Rehoboth Rebels | .807 |
| 42. | Schneider, Davis | (Alfc10) | Tiny Adorable Hoppy Froggies | .807 |
| 43. | Schneider, Davis | (Schvitz) | Milwaukee Thiefs | .806 |
| 44. | Bonds, Barry | (BAR23) | Bloomington Blue Bombers | .805 |
| 45. | Carpenter, Matt | (gpsman) | Detroit Tigers | .805 |
| 46. | Carpenter, Matt | (ColinBoucher) | Relentlessly Competent | .805 |
| 47. | Carpenter, Matt | (Doughboys) | California Bears | .804 |
| 48. | Bonds, Barry | Oshkosh Flyers | .804 | |
| 49. | Carpenter, Matt | (hanson) | MISSOURI MULES | .803 |
| 50. | Bonds, Barry | (Artinshki) | Base Ball Classics | .803 |
