most wins without a loss by a pitcher in a single season

Jack Chesbro has the most wins in wins in a season, with 41 wins in 1904.

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  • Regular season
NAMEWLSEASONTMW%L%GGSERASOCGSHOSVIPHERRHRBBHBPGFIBBTBFWPK/9BB/9K/BBHR/9K%BB%WHIPBABIPRAH/9
1Jack Chesbro
J. Chesbro
41
0
1904
1.000
.000
43
39
1.24
198
39
6
0
362.2
243
50
73
4
68
5
3
6
4.91
1.69
2.91
0.10
5.0
0.86
.223
1.81
6.03
2Ed Walsh
E. Walsh
40
0
1908
1.000
.000
51
35
209
34
11
6
367.0
248
57
1
40
8
15
1,381
5
5.13
0.98
5.23
0.02
15.1
2.9
0.78
.220
1.40
6.08
3Christy Mathewson
C. Mathewson
37
0
1908
1.000
.000
45
34
224
30
11
3
320.0
206
42
3
30
3
9
1,201
2
6.30
0.84
7.47
0.08
18.7
2.5
0.74
.216
1.18
5.79
4Walter Johnson
W. Johnson
36
0
1913
1.000
.000
41
29
0.63
204
23
11
2
288.0
175
20
31
5
36
5
11
1,056
1
6.38
1.13
5.67
0.16
19.3
3.4
0.73
.211
0.97
5.47
5Joe McGinnity
J. McGinnity
35
0
1904
1.000
.000
43
36
127
31
9
3
338.1
251
70
6
72
10
7
1,329
2
3.38
1.92
1.76
0.16
9.6
5.4
0.95
.220
1.86
6.68
6Joe Wood
J. Wood
34
0
1912
1.000
.000
38
33
0.30
231
30
10
1
301.1
228
78
2
60
10
5
1,173
5
6.90
1.79
3.85
0.06
19.7
5.1
0.96
.260
2.33
6.81
7Grover Alexander
G. Alexander
33
0
1916
1.000
.000
36
33
0.83
139
33
16
3
303.2
217
28
36
2
33
5
3
1,122
3
4.12
0.98
4.21
0.06
12.4
2.9
0.82
.228
1.07
6.43
8Walter Johnson
W. Johnson
33
0
1912
1.000
.000
38
27
0.16
232
25
7
2
282.1
191
47
0
52
8
11
1,068
7
7.40
1.66
4.46
0.00
21.7
4.9
0.86
.246
1.50
6.09
9Christy Mathewson
C. Mathewson
33
0
1904
1.000
.000
36
34
161
24
4
0
282.2
207
58
5
57
4
2
1,095
6
5.13
1.81
2.82
0.16
14.7
5.2
0.93
.233
1.85
6.59
10Cy Young
C. Young
33
0
1901
1.000
.000
33
31
1.15
130
30
5
0
290.0
232
37
64
5
23
7
2
0
4.03
0.71
5.65
0.16
2.2
0.88
.256
1.99
7.20
11Cy Young
C. Young
32
0
1902
1.000
.000
34
32
1.54
137
32
3
0
310.0
244
53
78
4
40
7
1
2
3.98
1.16
3.43
0.12
3.5
0.92
.250
2.26
7.08
12Denny McLain
D. McLain
31
0
1968
1.000
.000
35
35
1.70
259
28
6
0
302.0
209
57
62
24
52
5
0
1
1,145
3
7.72
1.55
4.98
0.72
22.6
4.5
0.86
.230
1.85
6.23
13Lefty Grove
L. Grove
31
0
1931
1.000
.000
37
27
1.88
153
25
4
5
263.2
222
55
73
8
59
1
9
1,056
1
5.22
2.01
2.59
0.27
14.5
5.6
1.07
.256
2.49
7.58
14Jim Bagby
J. Bagby
31
0
1920
1.000
.000
36
28
2.25
59
25
3
0
268.1
246
67
73
6
60
3
8
1,079
3
1.98
2.01
0.98
0.20
5.5
5.6
1.14
.252
2.45
8.25
15Grover Alexander
G. Alexander
31
0
1915
1.000
.000
39
33
0.95
192
30
12
4
302.0
187
32
53
2
49
5
6
1,137
1
5.72
1.46
3.92
0.06
16.9
4.3
0.78
.208
1.58
5.57
16Jack Coombs
J. Coombs
31
0
1910
1.000
.000
36
30
193
30
13
1
297.2
181
37
0
99
6
5
1,144
8
5.84
2.99
1.95
0.00
16.9
8.7
0.94
.214
1.12
5.47
17Christy Mathewson
C. Mathewson
31
0
1905
1.000
.000
34
29
169
25
8
3
264.2
173
45
3
49
0
5
996
3
5.75
1.67
3.45
0.10
17.0
4.9
0.84
.219
1.53
5.88
18Joe McGinnity
J. McGinnity
31
0
1903
1.000
.000
35
30
116
28
3
2
274.1
208
69
1
70
11
5
1,093
4
3.81
2.30
1.66
0.03
10.6
6.4
1.01
.231
2.26
6.82
19Dizzy Dean
D. Dean
30
0
1934
1.000
.000
43
28
2.00
172
23
7
7
278.2
229
62
75
10
58
4
13
1,123
2
5.56
1.87
2.97
0.32
15.3
5.2
1.03
.249
2.42
7.40
20Grover Alexander
G. Alexander
30
0
1917
1.000
.000
32
31
1.16
149
30
8
0
288.0
218
37
49
3
38
5
0
1,102
1
4.66
1.19
3.92
0.09
13.5
3.4
0.89
.237
1.53
6.81
21Christy Mathewson
C. Mathewson
30
0
1903
1.000
.000
32
29
183
26
3
1
261.2
216
76
3
63
5
3
1,051
15
6.29
2.17
2.90
0.10
17.4
6.0
1.07
.267
2.61
7.43
22Hal Newhouser
H. Newhouser
29
0
1944
1.000
.000
38
27
1.75
166
25
6
2
267.1
209
52
58
5
70
1
8
1,052
3
5.59
2.36
2.37
0.17
15.8
6.7
1.04
.252
1.95
7.04
23Eddie Cicotte
E. Cicotte
29
0
1919
1.000
.000
33
29
1.16
93
27
5
1
264.2
202
34
45
5
38
3
4
1,013
0
3.16
1.29
2.45
0.17
9.2
3.8
0.91
.225
1.53
6.87
24Claude Hendrix
C. Hendrix
29
0
1914
1.000
.000
38
28
1.34
153
27
6
5
282.0
182
42
61
4
61
6
10
5
4.88
1.95
2.51
0.13
6.5
0.86
.250
1.95
5.81
25George Mullin
G. Mullin
29
0
1909
1.000
.000
32
27
103
23
3
1
244.0
179
59
1
63
8
5
952
3
3.80
2.32
1.63
0.04
10.8
6.6
0.99
.229
2.18
6.60
StatMuse has game-level data for pitcher losses and pitcher wins going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.

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91
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14.0
65
97
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35.0
58
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AL EastWLPCTGB
Rays Rays - y
98
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.605
93
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.578
4.5
87
75
.537
11.0
79
82
.491
18.5
79
83
.488
19.0
AL CentralWLPCTGB
85
77
.525
84
78
.519
1.0
77
85
.475
8.0
76
86
.469
9.0
69
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16.0
AL WestWLPCTGB
81
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