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Single-Season ERA Leaderboard

* - Indicates Hall of Fame

Rank	Player	ERA	IP	Year	Career Leaderboard
1.	Dennis Baley	1.384	253.7	2022
2.	J.D. Martin	1.403	231.0	2018
3.	Mark Prior *	1.482	279.3	2009
4.	Mark Prior *	1.584	244.3	2011
5.	Mark Prior *	1.614	206.3	2014
6.	Mark Prior *	1.641	252.3	2013
7.	Roger Heitman	1.663	249.0	2013
8.	Felipe Granados	1.707	263.7	2019
9.	Korey Mathison	1.734	290.7	2021
10.	Lewis Washburn	1.816	257.7	2019
11.	Larry Strope	1.862	261.0	2009
12.	Augustine Stearn	1.863	236.7	2018
13.	Mark Prior *	1.886	238.7	2008
14.	Mark Prior *	1.891	185.7	2015
15.	Roger Heitman	1.929	224.0	2019
16.	J.D. Martin	1.966	224.3	2017
17.	Augustine Stearn	1.971	242.0	2022
18.	Willie Leon	1.972	237.3	2019
19.	Lewis Washburn	1.996	239.0	2021
20.	Roy Halladay	1.997	243.3	2007
21.	Roger Heitman	2.018	245.3	2016
22.	Korey Mathison	2.029	261.7	2019
23.	Augustine Stearn	2.030	248.3	2021
24.	Mark Prior *	2.056	227.7	2018
25.	Roger Heitman	2.057	170.7	2017
26.	Lewis Washburn	2.074	208.3	2020
27.	Roy Halladay	2.094	240.7	2008
28.	Mark Prior *	2.114	264.0	2006
29.	Brian Anderson	2.119	263.3	2014
30.	Roy Halladay	2.129	266.3	2006
31.	Zachery Hickman	2.131	245.0	2022
32.	John Atkins	2.140	164.0	2020
33.	Roy Halladay	2.144	268.7	2010
34.	Carlos Silva	2.147	197.0	2014
35.	Roy Halladay	2.160	275.0	2009
36.	Joseph Delagarza	2.163	224.7	2021
37.	Willie Leon	2.177	268.7	2022
38.	Mark Prior *	2.183	268.0	2007
39.	Brian Anderson	2.185	263.7	2020
40.	Henry Mosqueda	2.194	225.7	2021
41.	Roger Heitman	2.218	235.3	2018
42.	Freddie Cooley	2.222	263.3	2013
43.	Korey Mathison	2.224	287.3	2022
44.	Pedro Martinez	2.239	213.0	2005
45.	Joe Morgan Jr.	2.253	227.7	2018
46.	Kevin Rockey	2.260	219.0	2018
47.	Jeremy Bonderman	2.263	238.7	2012
48.	Joe Morgan Jr.	2.285	212.7	2012
49.	Mark Buehrle	2.293	259.0	2005
50.	Larry Strope	2.313	237.3	2008
51.	Mark Prior *	2.313	260.7	2005
52.	J.D. Martin	2.328	212.7	2013
53.	Larry Strope	2.332	239.3	2015
54.	J.D. Martin	2.343	226.7	2015
55.	Lewis Washburn	2.345	238.0	2022
56.	Dennis Baley	2.356	240.7	2021
57.	Brian Anderson	2.357	252.0	2021
58.	J.D. Martin	2.361	209.7	2016
59.	John Moore	2.362	247.7	2017
60.	Silvio Santacruz	2.365	255.0	2019
61.	Felipe Granados	2.372	227.7	2022
62.	Felipe Granados	2.374	235.0	2021
63.	Joe Morgan Jr.	2.375	204.7	2020
64.	Condel Ortiz	2.377	242.3	2015
65.	Freddie Cooley	2.378	257.3	2016
66.	J.D. Martin	2.381	234.3	2019
67.	Condel Ortiz	2.390	252.3	2014
68.	Bennie Hamblin	2.393	240.7	2020
69.	Josh Beckett	2.403	221.0	2006
70.	Mark Prior *	2.407	224.3	2017
71.	Henry Mosqueda	2.413	257.3	2018
72.	Adam Muniz	2.417	193.7	2018
73.	Roger Heitman	2.417	197.3	2014
74.	Steven Maney	2.420	215.7	2016
75.	Mark Prior *	2.422	174.7	2004
76.	Jose Guevara	2.429	226.0	2009
77.	Willian Larson	2.430	196.3	2021
78.	Augustine Stearn	2.438	243.7	2020
79.	Rick Ankiel	2.451	205.7	2013
80.	Korey Mathison	2.452	286.3	2020
81.	Richard Menzies	2.455	227.3	2012
82.	Kevin Rockey	2.455	216.3	2019
83.	Eric Losey	2.455	245.7	2021
84.	Silvio Santacruz	2.459	172.0	2022
85.	Roger Heitman	2.467	266.3	2012
86.	Brian Anderson	2.470	269.7	2015
87.	Silvio Santacruz	2.476	232.7	2020
88.	Dontrelle Willis	2.495	220.0	2006
89.	Carlos Zambrano	2.497	230.7	2010
90.	Roy Halladay	2.504	298.3	2005
91.	Matt Capps	2.505	244.3	2013
92.	Dennis Baley	2.507	247.7	2020
93.	Pedro Barranco	2.512	254.3	2011
94.	Carlos Zambrano	2.516	254.0	2009
95.	Oliver Perez	2.516	186.0	2008
96.	Roy Oswalt	2.546	268.7	2004
97.	Nicholas Lehr	2.549	226.0	2012
98.	Freddie Cooley	2.555	267.7	2017
99.	Steven Hildebrant	2.556	225.3	2021
100.	Rick Hummel	2.557	232.3	2013

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