Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.
Single-Season Leaders (BB/9)
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. | Decatur, Art | (dynasty8) | Louisville Lefties | 0.2 |
| 2. | Cummings, Candy | (beck) | Peoria River Kings | 0.2 |
| 3. | Lynch, Jack | (dbacksstar) | Accentuating Positives | 0.2 |
| 4. | DeLeon, Luis | (filler) | Montgomery Brewsters | 0.2 |
| 5. | Maltzberger, Gordon | Julious Geezers | 0.3 | |
| 6. | Swindell, Greg | (tbandit1) | NY Eagles | 0.3 |
| 7. | Betancourt, Rafael | (rfb60609) | Bird In Hand Mennonites | 0.3 |
| 8. | Eckersley, Dennis | (Conniemack) | Chicago American-Giants | 0.3 |
| 9. | Devlin, Jim | (Shpennymons) | Mister B-Bobbin-Bears | 0.3 |
| 10. | Cummings, Candy | (Shpennymons) | Oyster Bay Eagles | 0.3 |
| 11. | Eckersley, Dennis | (billyconn) | Fremont Tigers | 0.3 |
| 12. | Lynch, Jack | (filler) | Ziegfeld Follies | 0.4 |
| 13. | Rivera, Mariano | (griffeyga) | Krazy Knuckleballers | 0.4 |
| 14. | Eckersley, Dennis | (michelb3514) | Iowa Corn Pickers | 0.4 |
| 15. | Eckersley, Dennis | (Consigliere33) | Kansas City Royals | 0.4 |
| 16. | Cummings, Candy | (sheikyerboudi) | Bad News Beers | 0.4 |
| 17. | Saito, Takashi | (DaveH) | Ladson Dodgers | 0.4 |
| 18. | Beck, Rod | (tribetime89) | Seattle Rainiers | 0.4 |
| 19. | Eckersley, Dennis | (brawlers) | Texas Brawlers | 0.4 |
| 20. | Holland, Greg | (ScottCornelius) | London Yardbirds | 0.4 |
| 21. | Perez, Chris | (superheat) | Pittsburgh Black Sox | 0.4 |
| 22. | Spalding, Al | (gt049) | Hood River Experiments | 0.4 |
| 23. | Schilling, Curt | (noahis2cul4u) | Chittenango Wizards of Oz | 0.5 |
| 24. | Fingers, Rollie | (jackfactor) | Chicago Blackhawks | 0.5 |
| 25. | Eckersley, Dennis | (WorcWarr) | Worcester Warriors | 0.5 |
| 26. | Napier, Buddy | (baseball4ever) | Casablanca Gamblers | 0.5 |
| 27. | Hall, Dick | (filler) | Providence Grays | 0.5 |
| 28. | Doolittle, Sean | (rreebe916) | New York Americans | 0.5 |
| 29. | Devlin, Jim | (Fungoking) | Uptown Pinstripes | 0.5 |
| 30. | Yates, Kirby | (liddlefeat) | Cleveland Eries | 0.5 |
| 31. | Betancourt, Rafael | (filler) | Inland Empire Independents | 0.5 |
| 32. | Brosnan, Jim | (tgbsbl1967) | Charlotte Bulldogs | 0.5 |
| 33. | Darwin, Danny | (dynasty8) | Richmond Spiders | 0.5 |
| 34. | Doolittle, Sean | (joemcg) | OC Panthers | 0.5 |
| 35. | Smoltz, John | (WorcWarr) | Worcester Warriors | 0.5 |
| 36. | Powell, Jack | (dynasty) | Elmwood Park Tigers | 0.5 |
| 37. | Shaw, Jeff | (nickachap) | South Dakota Cavemen | 0.5 |
| 38. | Gonzalez, Mike | (plpl512) | Montreal Monarchs | 0.5 |
| 39. | Okajima, Hideki | (gibblets1973) | West End Wolves | 0.5 |
| 40. | Napier, Buddy | (honez) | Jersey City Giants | 0.5 |
| 41. | Eckersley, Dennis | (bostontex24) | B-Town All-Stars | 0.5 |
| 42. | Eckersley, Dennis | (Bsinco) | Forest Lake Rangers | 0.5 |
| 43. | Hughes, Tom | (gbacci) | Providence Steamrollers | 0.5 |
| 44. | Caruthers, Bob | (filler) | Wallington Yankees | 0.5 |
| 45. | Eckersley, Dennis | (vanderj6993) | Steroid City Roids | 0.5 |
| 46. | McGinnis, Jumbo | (czierk) | Hoboken Hobos | 0.5 |
| 47. | Camp, Rick | (Bears19) | Flux Capasitors | 0.5 |
| 48. | Rivera, Mariano | (paranoid) | Las Vegas Lasers | 0.5 |
| 49. | Rivera, Mariano | (nycubsfan) | Htown Skeeters | 0.5 |
| 50. | Doolittle, Sean | (gibblets1973) | Lumpy Gravy | 0.5 |