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	(DashJodytheGM)	Moscow Bears	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	(dom1134157)	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	(steve2745)	Liverpool Merseybeats	0.64
12.	Jansen, Kenley	(metfan1)	Bartonsville Pumas	0.65
13.	Chapman, Aroldis	(Artinshki)	Base Ball Classics	0.65
14.	Street, Huston	(Artinshki)	Base Ball Classics	0.68
15.	Papelbon, Jonathan	(ThEiRoNhOrSe04)	Liberty Banditos 57	0.68
16.	Abernathy, Ted	(Amorphis)	Bull Falls Terriers	0.68
17.	Davis, Wade	(phoopo125)	Alton Cavemen	0.69
18.	Kelley, Shawn	(Evilpuppy56)	Beastie Boys	0.70
19.	Adams, Mike	(Majestic44)	Memphis Dragons	0.71
20.	Alvarado, Jose	(bha45)	Boston Bees	0.71
21.	Chapman, Aroldis	(richgibson)	US CANNONFODDER	0.72
22.	Eckersley, Dennis	(jrobandsteal)	Boston Bees	0.72
23.	Feliz, Neftali	(richgibson)	Flying Spaghetti MONSTERS	0.73
24.	Howe, Steve	(filler)	H Town H's	0.72
25.	Wilhelm, Hoyt	(liddlefeat)	Raritan Retrievers	0.73
26.	Eckersley, Dennis	(cshaffer)	Vermont Lake Monsters	0.73
27.	Uehara, Koji	(dunroche)	Tuvalu Copras	0.74
28.	Belinda, Stan	(Trulaia)	staten island ironworkers	0.74
29.	Hall, Dick		Loudoun Lassos	0.75
30.	Broxton, Jonathan	(Roots)	Brooklyn Dodgers	0.75
31.	Benitez, Armando		Cazadero Ranchers	0.75
32.	Uehara, Koji	(rreebe916)	Strinestown DriveIners	0.75
33.	Iglesias, Raisel	(coachmcs)	Death Valley Devils	0.76
34.	Harris, Will	(jeter0296)	Staten Island Yankees	0.77
35.	Montgomery, Jeff	(johnmardis)	Warner Town Animaniacs	0.78
36.	Papelbon, Jonathan	(RichieBlondet)	Brooklyn Boppers	0.78
37.	Adams, Mike	(MikeDrop0221)	Roided Up Crazies	0.78
38.	Diaz, Carlos	(jeter0296)	Freehold Knights	0.79
39.	Gagne, Eric	(richp)	Danville Duds	0.81
40.	Harden, Rich	(stonemob)	Pittsburgh Hornets	0.80
41.	Holland, Greg	(michelb3514)	Iowa Corn Pickers	0.81
42.	Eichhorn, Mark	(johnmardis)	Warner Town Animaniacs	0.81
43.	Uehara, Koji	(richgibson)	Leas YIPPIES	0.81
44.	Zimmerman, Jeff	(filler)	WF Greyhounds	0.82
45.	Fromme, Art	(filler)	Wild Cats	0.82
46.	Capps, Carter	(chaaad)	Bartons Nighthawks	0.81
47.	Melancon, Mark	(Trulaia)	Chapecó Panther	0.82
48.	Valverde, Jose		Baltimore Orioles	0.83
49.	Boxberger, Brad	(REVEJB)	Atari 1600's	0.82
50.	Foulke, Keith	(sgt714)	Boston Red Sox	0.83