Favorite Teams leagues are not included in Single-Season records. Records only remain for 10 seasons.

Single-Season Leaders (ERA)

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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.	Jansen, Kenley	(morangslick)	Chicago Reapers	0.28
2.	Schiraldi, Calvin	(Lstiver)	Marion Center Devils	0.57
3.	Jackson, Mike	(shelley71)	Burma Harry Butz	0.57
4.	Nathan, Joe	(Mortamar1966)	Morleyville Mud Skippers	0.58
5.	Eichhorn, Mark	(chaaad)	Newark Eagles	0.59
6.	Rivera, Mariano	(filler2)	Raging Roiders	0.60
7.	Adams, Mike	(nycubsfan)	Jackson Heights Knights	0.63
8.	McGraw, Tug	(rowdy1982)	Team Seven	0.64
9.	Jansen, Kenley	(cbach)	Port Saint Lucie Patriots	0.65
10.	Chapman, Aroldis	(Artinshki)	Base Ball Classics	0.65
11.	Papelbon, Jonathan	(ThEiRoNhOrSe04)	Liberty Banditos 57	0.68
12.	Abernathy, Ted	(liddlefeat)	New Brunswick Zebras	0.68
13.	Street, Huston	(Artinshki)	Base Ball Classics	0.68
14.	Radatz, Dick	(joeboodah)	San Juan Suns	0.68
15.	Davis, Wade	(Omalaf)	Oakland Arachnid	0.69
16.	Kelley, Shawn	(Evilpuppy56)	Beastie Boys	0.70
17.	Pressly, Ryan	(joshswiney)	Cohutta Colts	0.71
18.	Adams, Mike	(filler8)	Forest City Owls	0.71
19.	Alvarado, Jose	(filler8)	Boston Bees	0.71
20.	Chapman, Aroldis	(rreebe916)	Pinchot Park Rangers	0.72
21.	Eckersley, Dennis	(jrobandsteal)	Boston Bees	0.72
22.	Howe, Steve	(Bsinco)	H Town H's	0.72
23.	Feliz, Neftali	(ranger)	J'VILLE JETS	0.73
24.	Wagner, Billy	(Majestic44)	Tacoma Predators	0.72
25.	Wilhelm, Hoyt	(liddlefeat)	Raritan Retrievers	0.73
26.	Eckersley, Dennis	(Trulaia)	Vermont Lake Monsters	0.73
27.	Broxton, Jonathan	(Joshhuth)	Brooklyn Dodgers	0.75
28.	Hall, Dick	(babyave1)	Loudoun Lassos	0.75
29.	Iglesias, Raisel	(djburton1261)	Death Valley Devils	0.76
30.	Montgomery, Jeff	(johnmardis)	Warner Town Animaniacs	0.78
31.	Papelbon, Jonathan	(RichieBlondet)	Brooklyn Boppers	0.78
32.	Nomura, Takahito	(filler8)	新潟コシヒカリ	0.80
33.	Benoit, Joaquin	(Zeedood)	Halifax Hypno Toads	0.80
34.	Gagne, Eric	(rfb60609)	Danville Duds	0.81
35.	Holland, Greg	(michelb3514)	Iowa Corn Pickers	0.81
36.	Zimmerman, Jeff	(MikeDrop0221)	WF Greyhounds	0.82
37.	Capps, Carter	(chaaad)	Bartons Nighthawks	0.81
38.	Fromme, Art	(filler)	Wild Cats	0.82
39.	Melancon, Mark	(Trulaia)	Chapecó Panther	0.82
40.	Foulke, Keith	(sgt714)	Boston Red Sox	0.83
41.	Valverde, Jose		Baltimore Orioles	0.83
42.	Giles, Ken	(bnewman58)	Macon Mistakes	0.83
43.	Gallegos, Giovanny	(Mav54)	Arizona Aces	0.83
44.	McCool, Billy	(MJR)	MidTown Townies	0.84
45.	Gossage, Rich	(gpsman)	Crosstown Cranberries	0.85
46.	Russell, Jeff	(jericho2u)	Dixie Boy Happy Toyz	0.85
47.	Rivera, Mariano	(paranoid)	Las Vegas Scorpions	0.85
48.	Rivera, Mariano	(Zeedood)	Pinochet Pilots	0.85
49.	Saito, Takashi	(BobbyCarnes)	RED Sergeants	0.85
50.	Percival, Troy	(dynasty)	Oklahoma Rockhounds	0.85