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.	Adams, Mike	(RichieBlondet)	West Side Whizzers	0.27
2.	Jansen, Kenley	(morangslick)	Chicago Reapers	0.28
3.	Benitez, Armando	(Noleary)	Baltimore Monumentals	0.52
4.	Schiraldi, Calvin	(Malone824)	Bluff City Eagles	0.57
5.	Jackson, Mike	(nmiller4)	Cincinnati Reds	0.57
6.	Nathan, Joe	(Mortamar1966)	Morleyville Mud Skippers	0.58
7.	Eichhorn, Mark	(chaaad)	Newark Eagles	0.59
8.	Rivera, Mariano	(chunkyschumps)	Raging Roiders	0.60
9.	Adams, Mike	(nycubsfan)	Jackson Heights Knights	0.63
10.	Uehara, Koji	(ranger)	DEER PARK DEER	0.63
11.	McGraw, Tug		Seven of Nine	0.64
12.	Chapman, Aroldis	(Artinshki)	Base Ball Classics	0.65
13.	Jansen, Kenley	(metfan1)	Bartonsville Pumas	0.65
14.	Papelbon, Jonathan	(ThEiRoNhOrSe04)	Liberty Banditos 57	0.68
15.	Street, Huston	(Artinshki)	Base Ball Classics	0.68
16.	Abernathy, Ted	(joeboodah)	New Brunswick Zebras	0.68
17.	Davis, Wade	(JPThaRipper)	Alton Cavemen	0.69
18.	Kelley, Shawn	(Evilpuppy56)	Beastie Boys	0.70
19.	Adams, Mike	(dynasty)	Forest City Owls	0.71
20.	Alvarado, Jose	(dynasty8)	Boston Bees	0.71
21.	Chapman, Aroldis	(Artinshki)	Base Ball Classics	0.72
22.	Howe, Steve	(Bsinco)	H Town H's	0.72
23.	Feliz, Neftali	(ranger)	J'VILLE JETS	0.73
24.	Eckersley, Dennis	(jrobandsteal)	Boston Bees	0.72
25.	Wilhelm, Hoyt	(liddlefeat)	Raritan Retrievers	0.73
26.	Eckersley, Dennis	(Trulaia)	Vermont Lake Monsters	0.73
27.	Uehara, Koji	(dunroche)	Tuvalu Copras	0.74
28.	Broxton, Jonathan	(Roots)	Brooklyn Dodgers	0.75
29.	Hall, Dick	(babyave1)	Loudoun Lassos	0.75
30.	Benitez, Armando	(757Moose)	Back in the day Brawlers	0.75
31.	Uehara, Koji	(rreebe916)	Strinestown DriveIners	0.75
32.	Iglesias, Raisel	(coachmcs)	Death Valley Devils	0.76
33.	Montgomery, Jeff	(johnmardis)	Warner Town Animaniacs	0.78
34.	Harris, Will	(jeter0296)	Staten Island Yankees	0.77
35.	Papelbon, Jonathan	(RichieBlondet)	Brooklyn Boppers	0.78
36.	Adams, Mike	(infmusxp)	Roided Up Crazies	0.78
37.	Gagne, Eric	(Mrploppie)	Danville Duds	0.81
38.	Holland, Greg	(michelb3514)	Iowa Corn Pickers	0.81
39.	Eichhorn, Mark	(johnmardis)	Warner Town Animaniacs	0.81
40.	Capps, Carter	(chaaad)	Bartons Nighthawks	0.81
41.	Uehara, Koji	(Talon92tsi)	Really Mean Hamsters	0.81
42.	Zimmerman, Jeff	(filler)	WF Greyhounds	0.82
43.	Fromme, Art	(filler)	Wild Cats	0.82
44.	Melancon, Mark	(Trulaia)	Chapecó Panther	0.82
45.	Boxberger, Brad	(REVEJB)	Atari 1600's	0.82
46.	Foulke, Keith	(sgt714)	Boston Red Sox	0.83
47.	Valverde, Jose	(heheman69)	Baltimore Orioles	0.83
48.	Giles, Ken	(LDJS1947)	MISSOURI MONARCHS	0.83
49.	Gallegos, Giovanny	(hanson)	Arizona Aces	0.83
50.	Benitez, Armando	(filler)	62 Archers of Love	0.84