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	(tjm)	Lake Mills Bulldogs	0.00
2.	Robertson, David	(Shirtless_Lahey)	Destin Snowbirds	0.00
3.	Britton, Zach	(skieff)	Hustons Mill YardHawks	0.00
4.	Balfour, Grant	(doughboys)	Minneapolis Doughboys	0.00
5.	Buchter, Ryan	(ColinBoucher)	Alpha Bet City 🔤's	0.00
6.	Harris, Will	(Morcha)	San Francisco 420ers	0.14
7.	Miller, Andrew	(RyanSTL)	Tulsa Union Redskins	0.15
8.	Hand, Brad		Bailey Mountaineers	0.15
9.	Boxberger, Brad	(Myunclepunk)	Chicago Feens	0.16
10.	Madson, Ryan	(baconfats)	Clubber Langs	0.16
11.	Saito, Takashi	(ScottHouston)	Jakarta Colts	0.16
12.	Lyons, Tyler	(doittoitlars)	Gorilla Harambe	0.18
13.	Jansen, Kenley		Montreal Bulldogs	0.18
14.	Boxberger, Brad	(thunderstruck)	Cape Cod MARINERS	0.20
15.	Carman, Don	(johnmardis)	Ottawa Otters	0.20
16.	Adams, Mike	(Ruthbonds)	Chicago Black Sox	0.21
17.	Feliz, Neftali	(Myunclepunk)	Chicago Feens	0.23
18.	Brewer, Jim		Virginia Rebels	0.23
19.	Bush, Matt		Almendares Scorpions	0.24
20.	Rodriguez, Francisco	(vaughnk003)	Sparta Warriors	0.24
21.	Hall, Tom	(majestic44)	Santa Cruz Sluggers	0.24
22.	Howell, Jay	(BaltimoreChop)	Portland Pork Chops	0.25
23.	Marshall, Mike	(Grals)	Las Vegas Locusts	0.25
24.	Street, Huston		Bakersfield Bulldogs	0.25
25.	Blanton, Joe	(Joemcg)	OC Hornets	0.26
26.	Street, Huston	(richgibson)	School Workers Organizers	0.26
27.	Wilhelm, Hoyt	(Jsuer1971)	Havana Cienfuegos	0.27
28.	Adams, Mike	(gate-mouth)	Humbolt 💰⚾	0.28
29.	Marmol, Carlos		CAPITOL HILL REDSKINS 56	0.28
30.	Pfiester, Jack	(Madbumfan)	Chattanooga Drifters	0.28
31.	Sasaki, Kazuhiro	(rfb60609)	Biglerville Apple Pickers	0.28
32.	Wagner, Billy	(babyave1)	North Bridgton Fins	0.28
33.	Kimbrel, Craig	(Dollarhotdog)	Muddville Nine	0.28
34.	Gossage, Rich	(dunroche)	Inland Empire 66ers	0.28
35.	Putz, J.J.	(tbone34)	Atlanta Brick Squad	0.29
36.	Benitez, Armando	(jamin)	Chester Springs Menjai	0.30
37.	Smith, Dave	(sklap)	Burlington Bees	0.29
38.	Neshek, Pat	(joemcg)	OC Banditos	0.32
39.	Miller, Andrew	(UNHBombers)	Stowe UNH Bombers	0.33
40.	Vizcaino, Arodys	(Axlrose)	Las Vegas ASHBA's	0.34
41.	Uehara, Koji	(MicMag)	H-Town Colt 45s	0.34
42.	Edwards, Carl	(JKLKSK18)	Pittsburgh Pirates	0.34
43.	LaRoche, Dave	(ScubaDivers)	Naples Scuba Divers	0.34
44.	Kensing, Logan	(Cdubb7)	Picksburgh Pirates	0.36
45.	Miller, Andrew	(jallen)	Delta City Gamblers	0.36
46.	Hader, Josh	(chapman)	Jokes On You Fighting Clowns	0.36
47.	Drabowsky, Moe	(stengel28)	Williams Grove Racers	0.36
48.	Miller, Stu	(andyyoung)	New York Knights	0.37
49.	Jansen, Kenley	(Grittyshaker)	Sacramento River Cats	0.37
50.	Jansen, Kenley	(bktreadway)	St. Louis Cardinals	0.37