lowest era in season with at least 40 ip

Buck O'Brien has the best ERA with 40.0+ innings pitched in a season, with an ERA of 0.38 in his rookie season in 1911.

Interpreted as:
lowest era by a player in season with at least 40 ip
NAMEERAIPSEASONTMGWLW%GSSOCGSHOSVHERRHRBBHBPGFIBBTBFWPK/9BB/9K/BBHR/9K%BB%WHIPBABIPRAERA-FIPFIP-H/9PRAA
1Buck O'Brien
B. O'Brien
0.38
47.2
1911
BSA BSA
6
5
1
.833
5
31
5
2
0
30
2
9
0
21
1
1
189
0
5.85
3.97
1.48
0.00
16.4
11.1
1.07
.221
1.70
11
2.85
88
5.66
2
2Zack Britton
Z. Britton
0.54
67.0
2016
BAL BAL
69
2
1
.667
0
74
0
0
47
38
4
7
1
18
0
63
3
254
10
9.94
2.42
4.11
0.13
29.1
7.1
0.84
.230
0.94
13
1.93
44
5.10
17.7
3Joey Devine
J. Devine
0.59
45.2
2008
OAK OAK
42
6
1
.857
0
49
0
0
1
23
3
7
0
15
0
10
2
170
0
9.66
2.96
3.27
0.00
28.8
8.8
0.83
.217
1.38
14
1.96
46
4.53
11.7
4Fernando Rodney
F. Rodney
0.60
74.2
2012
TBR TBR
76
2
2
.500
0
76
0
0
48
43
5
9
2
15
3
65
1
282
4
9.16
1.81
5.07
0.24
27.0
5.3
0.78
.220
1.08
16
2.12
52
5.18
16.2
5Emmanuel Clase
E. Clase
0.61
74.1
2024
CLE CLE
74
4
2
.667
0
66
0
0
47
39
5
10
2
10
2
66
1
270
2
7.99
1.21
6.60
0.24
24.4
3.7
0.66
.195
1.21
15
2.22
55
4.72
15.2
6Dennis Eckersley
D. Eckersley
0.61
73.1
1990
OAK OAK
63
4
2
.667
0
73
0
0
48
41
5
9
2
4
0
61
1
262
0
8.96
0.49
18.25
0.25
27.9
1.5
0.61
.213
1.10
17
1.33
35
5.03
20.6
7George McQuillan
G. McQuillan
0.66
41.0
1907
PHN PHN
6
4
0
1.000
5
28
5
3
0
21
3
3
0
11
1
1
145
1
6.15
2.41
2.55
0.00
19.3
7.6
0.78
.200
0.66
27
1.69
64
4.61
4.3
8Casey Sadler
C. Sadler
0.67
40.1
2021
SEA SEA
42
0
1
.000
0
37
0
0
0
19
3
4
1
10
1
2
0
145
2
8.26
2.23
3.70
0.22
25.5
6.9
0.72
.188
0.89
16
2.47
59
4.24
7.7
9Rob Murphy
R. Murphy
0.72
50.1
1986
CIN CIN
34
6
0
1.000
0
36
0
0
1
26
4
4
0
21
0
12
2
195
5
6.44
3.75
1.71
0.00
18.5
10.8
0.93
.188
0.72
19
2.58
67
4.65
7
10Barry Latman
B. Latman
0.76
47.2
1958
CWS CWS
13
3
0
1.000
3
28
1
1
0
27
4
7
1
17
1
3
0
188
1
5.29
3.21
1.65
0.19
14.9
9.0
0.92
.184
1.32
20
2.71
73
5.10
5.5
11Rich Gossage
R. Gossage
0.77
46.2
1981
NYY NYY
32
3
2
.600
0
48
0
0
20
22
4
6
2
14
1
30
1
173
1
9.26
2.70
3.43
0.39
27.7
8.1
0.77
.185
1.16
22
2.06
57
4.24
8.3
12Blake Treinen
B. Treinen
0.78
80.1
2018
OAK OAK
68
9
2
.818
0
100
0
0
38
46
7
12
2
21
1
58
3
315
6
11.20
2.35
4.76
0.22
31.7
6.7
0.83
.230
1.34
19
1.81
44
5.15
21
13Earl Hamilton
E. Hamilton
0.83
54.0
1918
PIT PIT
6
6
0
1.000
6
20
6
1
0
47
5
7
0
13
0
0
210
1
3.33
2.17
1.54
0.00
9.5
6.2
1.11
.266
1.17
30
2.21
80
7.83
3.3
14Nick Maddox
N. Maddox
0.83
54.0
1907
PIT PIT
6
5
1
.833
6
38
6
1
0
32
5
8
0
13
4
0
197
1
6.33
2.17
2.92
0.00
19.3
6.6
0.83
.225
1.33
34
1.72
65
5.33
5.5
15Tim Keefe
T. Keefe
0.86
105.0
1880
TRO
12
6
6
.500
12
39
12
0
0
68
10
27
0
16
0
397
1
3.34
1.37
2.44
0.00
9.8
4.0
0.80
2.31
35
2.25
91
5.83
3.6
16Cisco Carlos
C. Carlos
0.86
41.2
1967
CWS CWS
8
2
0
1.000
7
27
1
1
0
23
4
5
0
9
1
1
0
158
1
5.83
1.94
3.00
0.00
17.1
5.7
0.77
.190
1.08
28
1.96
60
4.97
6.1
17Bill Henry
B. Henry
0.87
52.0
1964
CIN CIN
37
2
2
.500
0
28
0
0
6
31
5
9
2
12
3
20
4
202
1
4.85
2.08
2.33
0.35
13.9
5.9
0.83
.185
1.56
24
2.89
82
5.37
3.6
18Dennys Reyes
D. Reyes
0.89
50.2
2006
MIN MIN
66
5
0
1.000
0
49
0
0
0
35
5
8
3
15
0
8
2
194
4
8.70
2.66
3.27
0.53
25.3
7.7
0.99
.252
1.42
20
2.86
65
6.22
8.7
19Ferdie Schupp
F. Schupp
0.90
140.1
1916
NYG NYG
30
9
3
.750
11
86
8
4
1
79
14
22
1
37
5
17
525
2
5.52
2.37
2.32
0.06
16.4
7.0
0.83
.197
1.41
36
2.08
84
5.07
6.1
20Jonathan Papelbon
J. Papelbon
0.92
68.1
2006
BOS BOS
59
4
2
.667
0
75
0
0
35
40
7
8
3
13
1
49
2
257
2
9.88
1.71
5.77
0.40
29.2
5.1
0.78
.224
1.05
20
2.13
48
5.27
17.7
21Wade Davis
W. Davis
0.94
67.1
2015
KCR KCR
69
8
1
.889
0
78
0
0
17
33
7
8
3
20
0
24
1
251
1
10.43
2.67
3.90
0.40
31.1
8.0
0.79
.200
1.07
23
2.28
58
4.41
12.7
22Chris Hammond
C. Hammond
0.95
76.0
2002
ATL ATL
63
7
2
.778
0
63
0
0
0
53
8
15
1
31
1
6
9
311
1
7.46
3.67
2.03
0.12
20.3
10.0
1.11
.242
1.78
23
2.73
65
6.28
12.3
23Aaron Loup
A. Loup
0.95
56.2
2021
NYM NYM
65
6
0
1.000
2
57
0
0
0
37
6
9
1
16
4
6
0
218
0
9.05
2.54
3.56
0.16
26.1
7.3
0.94
.257
1.43
24
2.44
58
5.88
11.2
24Dutch Leonard
D. Leonard
0.96
224.2
1914
BSA BSA
36
19
5
.792
25
176
17
7
3
139
24
34
3
60
8
8
842
2
7.05
2.40
2.93
0.12
20.9
7.1
0.89
.229
1.36
36
1.95
70
5.57
20.4
25Eric O'Flaherty
E. O'Flaherty
0.98
73.2
2011
ATL ATL
78
2
4
.333
0
67
0
0
0
59
8
9
2
21
3
5
8
301
1
8.19
2.57
3.19
0.24
22.3
7.0
1.09
.274
1.10
26
2.53
67
7.21
10.3
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