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 Wins Losses ERA WHIP Innings Hits Allowed HR Allowed Walks (P) Strikeouts (p) Complete Games Saves Blown Saves Shutouts Wild Pitches Hit Batters H/9 BB/9 SO/9

1.	Rivera, Mariano	(Consigliere33)	Chicago Cubs	0.00
2.	Robertson, David	(bobtoo999)	Destin Snowbirds	0.00
3.	Britton, Zach	(skieff)	Hustons Mill YardHawks	0.00
4.	Balfour, Grant	(CaliCrossover)	Pillsbury Doughboys	0.00
5.	Hand, Brad	(stew)	Edmonton Crazy Horse	0.15
6.	Boxberger, Brad	(Myunclepunk)	Chicago Feens	0.16
7.	Madson, Ryan	(baconfats)	Clubber Langs	0.16
8.	Saito, Takashi	(ScottHouston)	Jakarta Colts	0.16
9.	Lyons, Tyler		Gorilla Harambe	0.18
10.	Jansen, Kenley	(jericho2u)	Stark City Iron Men	0.18
11.	Boxberger, Brad	(thunderstruck)	Cape Cod MARINERS	0.20
12.	Carman, Don	(johnmardis)	Ottawa Otters	0.20
13.	Adams, Mike	(Ruthbonds)	Chicago Black Sox	0.21
14.	Broxton, Jonathan	(strutter)	Baseball Furies	0.23
15.	Brewer, Jim		Rebel Smile	0.23
16.	Feliz, Neftali	(Myunclepunk)	Chicago Feens	0.23
17.	Hall, Tom	(Gibblets1973)	Los Gibbletos 19inteen	0.24
18.	Howell, Jay	(BaltimoreChop)	Portland Pork Chops	0.25
19.	Street, Huston		MYRTLE BEACH BIGTIMES	0.25
20.	Blanton, Joe	(Joemcg)	OC Hornets	0.26
21.	Street, Huston		School Workers Organizers	0.26
22.	Wilhelm, Hoyt	(Doolio)	Havana Cienfuegos	0.27
23.	Adams, Mike	(gate-mouth)	Humbolt 💰⚾	0.28
24.	Marmol, Carlos		CAPITOL HILL REDSKINS 56	0.28
25.	Pfiester, Jack	(PARATROOPER22)	DALLAS DRIFTERS	0.28
26.	Kimbrel, Craig	(Dollarhotdog)	Muddville Nine	0.28
27.	Wagner, Billy	(babyave1)	North Bridgton Fins	0.28
28.	Gossage, Rich	(dunroche)	Inland Empire 66ers	0.28
29.	Putz, J.J.	(tbone34)	Atlanta Brick Squad	0.29
30.	Benitez, Armando	(jamin)	Chester Springs Menjai	0.30
31.	Smith, Dave	(dbutts)	Burlington Bees	0.29
32.	Neshek, Pat	(joemcg)	OC Banditos	0.32
33.	Miller, Andrew	(UNHBombers)	Stowe UNH Bombers	0.33
34.	Vizcaino, Arodys	(Raidergreg72)	Saint Charles RiverCats	0.34
35.	Uehara, Koji	(iamhamby)	H-Town Colt 45s	0.34
36.	Edwards, Carl	(IceHockey)	Pittsburgh Pirates	0.34
37.	LaRoche, Dave		Seattle Pilots	0.34
38.	McHugh, Collin		Tampa Arsenal	0.36
39.	Kensing, Logan	(Cdubb7)	Picksburgh Pirates	0.36
40.	Miller, Andrew	(rick104221)	Delta City Gamblers	0.36
41.	Hader, Josh	(chapman)	Jokes On You Fighting Clowns	0.36
42.	Drabowsky, Moe	(stengel28)	Williams Grove Racers	0.36
43.	Miller, Stu	(andyyoung)	New York Knights	0.37
44.	Jansen, Kenley	(korndog41)	Sacramento River Cats	0.37
45.	Hoffman, Trevor	(alrosen)	TU CHHS 135	0.38
46.	Gagne, Eric	(lvraider)	Gas House Gorillas	0.37
47.	Edwards, Carl	(BigRedMachine90)	Beating My Snake	0.38
48.	Chapman, Aroldis	(ColinBoucher)	Alpha Bet City 🔤's	0.39
49.	Street, Huston	(Rfb60609)	Shady Maple Smorgasborders	0.38
50.	Kela, Keone	(iamhamby)	H-Town Colt 45s	0.39