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		Destin Snowbirds	0.00
3.	Britton, Zach	(skieff)	Hustons Mill YardHawks	0.00
4.	Balfour, Grant	(JoshuaGregory12)	Pillsbury Doughboys	0.00
5.	Hand, Brad		Edmonton Crazy Horse	0.15
6.	Boxberger, Brad	(Myunclepunk)	Chicago Feens	0.16
7.	Madson, Ryan	(Clarkkent5353)	Clubber Langs	0.16
8.	Roebuck, Ed	(jpcortez)	Mid-Century Moderns	0.16
9.	Saito, Takashi	(ScottHouston)	Jakarta Colts	0.16
10.	Jansen, Kenley	(Hfhjrfg)	Stark City Iron Men	0.18
11.	Lyons, Tyler	(Mickey)	Gorilla Harambe	0.18
12.	Boxberger, Brad	(thunderstruck)	Cape Cod MARINERS	0.20
13.	Carman, Don	(johnmardis)	Ottawa Otters	0.20
14.	Adams, Mike	(Ruthbonds)	Chicago Black Sox	0.21
15.	Broxton, Jonathan	(strutter)	Baseball Furies	0.23
16.	Brewer, Jim	(mickey7)	Rebel Smile	0.23
17.	Feliz, Neftali	(Myunclepunk)	Chicago Feens	0.23
18.	Hall, Tom	(Gibblets1973)	Los Gibbletos 19inteen	0.24
19.	Howell, Jay	(BaltimoreChop)	Portland Pork Chops	0.25
20.	Boxberger, Brad	(dunroche)	Nevada Racin' Rebels	0.25
21.	Street, Huston	(Bj99)	MYRTLE BEACH BIGTIMES	0.25
22.	Blanton, Joe	(Joemcg)	OC Hornets	0.26
23.	Street, Huston	(tgbbirch)	Quincy Frogs	0.26
24.	Wilhelm, Hoyt	(Doolio)	Havana Cienfuegos	0.27
25.	Adams, Mike	(johnso)	Humbolt 💰⚾	0.28
26.	Marmol, Carlos	(tda81)	The Dangerous Alliance	0.28
27.	Pfiester, Jack	(PARATROOPER22)	DALLAS DRIFTERS	0.28
28.	Kimbrel, Craig	(Dollarhotdog)	Muddville Nine	0.28
29.	Wagner, Billy	(babyave1)	North Bridgton Fins	0.28
30.	Gossage, Rich	(dunroche)	Inland Empire 66ers	0.28
31.	Putz, J.J.	(tbone34)	Atlanta Brick Squad	0.29
32.	Benitez, Armando	(jamin)	Chester Springs Menjai	0.30
33.	Smith, Dave	(dbutts)	Burlington Bees	0.29
34.	Neshek, Pat	(joemcg)	OC Banditos	0.32
35.	Miller, Andrew	(UNHBombers)	Stowe UNH Bombers	0.33
36.	Vizcaino, Arodys	(Raidergreg72)	Saint Charles RiverCats	0.34
37.	Uehara, Koji	(Rogerio)	H-Town Colt 45s	0.34
38.	Edwards, Carl	(Mickey)	Seattle Outlaws	0.34
39.	LaRoche, Dave	(Kaline6)	Seattle Pilots	0.34
40.	McHugh, Collin	(rickmc)	Ridgefield Summerhawks	0.36
41.	Kensing, Logan	(Cdubb7)	Picksburgh Pirates	0.36
42.	Miller, Andrew	(danpolsky3)	Delta City Gamblers	0.36
43.	Hader, Josh	(chapman)	Jokes On You Fighting Clowns	0.36
44.	Drabowsky, Moe	(stengel28)	Williams Grove Racers	0.36
45.	Miller, Stu	(andyyoung)	New York Knights	0.37
46.	Jansen, Kenley		Sacramento River Cats	0.37
47.	Hoffman, Trevor		TU CHHS 135	0.38
48.	Gagne, Eric	(lvraider)	Gas House Gorillas	0.37
49.	Edwards, Carl	(BigRedMachine90)	Beating My Snake	0.38
50.	Chapman, Aroldis	(ColinBoucher)	Alpha Bet City 🔤's	0.39