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	(rowdy1982)	Seven of Nine	0.64
12.	Jansen, Kenley	(metfan1)	Bartonsville Pumas	0.65
13.	Chapman, Aroldis	(Artinshki)	Base Ball Classics	0.65
14.	Abernathy, Ted	(liddlefeat)	New Brunswick Zebras	0.68
15.	Street, Huston	(Artinshki)	Base Ball Classics	0.68
16.	Papelbon, Jonathan	(ThEiRoNhOrSe04)	Liberty Banditos 57	0.68
17.	Davis, Wade	(Malone824)	Alton Cavemen	0.69
18.	Kelley, Shawn	(Evilpuppy56)	Beastie Boys	0.70
19.	Alvarado, Jose	(dynasty8)	Boston Bees	0.71
20.	Adams, Mike	(dynasty)	Forest City Owls	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.	Baez, Pedro	(bodell82)	Los Angeles Dodgers	0.72
26.	Wilhelm, Hoyt	(liddlefeat)	Raritan Retrievers	0.73
27.	Eckersley, Dennis	(Trulaia)	Vermont Lake Monsters	0.73
28.	Uehara, Koji	(dunroche)	Tuvalu Copras	0.74
29.	Broxton, Jonathan	(Roots)	Brooklyn Dodgers	0.75
30.	Hall, Dick	(babyave1)	Loudoun Lassos	0.75
31.	Benitez, Armando	(757Moose)	Back in the day Brawlers	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	(rfb60609)	Danville Duds	0.81
38.	Holland, Greg	(michelb3514)	Iowa Corn Pickers	0.81
39.	Eichhorn, Mark	(johnmardis)	Warner Town Animaniacs	0.81
40.	Fromme, Art	(filler)	Wild Cats	0.82
41.	Uehara, Koji	(Talon92tsi)	Really Mean Hamsters	0.81
42.	Zimmerman, Jeff	(filler)	WF Greyhounds	0.82
43.	Capps, Carter	(chaaad)	Bartons Nighthawks	0.81
44.	Melancon, Mark	(Trulaia)	Chapecó Panther	0.82
45.	Valverde, Jose		Baltimore Orioles	0.83
46.	Foulke, Keith	(sgt714)	Boston Red Sox	0.83
47.	Giles, Ken	(LDJS1947)	MISSOURI MONARCHS	0.83
48.	Gallegos, Giovanny	(hanson)	Arizona Aces	0.83
49.	Kimbrel, Craig	(nycubsfan)	Klein Bearkats	0.84
50.	McCool, Billy	(peteym17)	Potomac Pirates	0.84