what baseball team had the highest winning percentage in a season since 1920

Since 1920, the Cleveland Indians have the highest winning percentage by a team in a season, winning 72.1 percent of the time in 1954.

TEAMW%SEASONWLGABRH2B3BHRRBIBBHBPSOSBCSPATBXBHSHSFIBBGIDPAVGOBPSLGOPS
1Indians
Indians
.721
1954
111
43
156
5,222
746
1,368
188
39
156
714
637
23
668
30
33
6,048
2,102
383
107
59
114
.262
.341
.403
.744
2Dodgers
Dodgers
.717
2020
43
17
60
2,042
349
523
97
6
118
327
228
30
471
29
8
2,315
986
221
3
12
7
46
.256
.338
.483
.821
3Mariners
Mariners
.716
2001
116
46
162
5,680
927
1,637
310
38
169
881
614
62
989
174
42
6,474
2,530
517
48
70
54
112
.288
.360
.445
.805
4Yankees
Yankees
.714
1927
110
44
155
5,354
976
1,644
291
103
158
907
642
22
610
90
64
6,222
2,615
552
204
.307
.384
.488
.872
5Athletics
Athletics
.704
1931
107
45
153
5,377
858
1,544
311
64
118
798
528
35
543
25
23
6,018
2,337
493
78
.287
.355
.435
.789
6Yankees
Yankees
.704
1998
114
48
162
5,643
965
1,625
290
31
207
907
653
57
1,025
153
63
6,444
2,598
528
32
59
34
145
.288
.364
.460
.825
7Yankees
Yankees
.702
1939
106
45
152
5,300
967
1,521
259
55
166
904
701
36
543
72
37
6,129
2,388
480
92
99
.287
.374
.451
.825
8Yankees
Yankees
.695
1932
107
47
156
5,476
1,002
1,564
279
82
160
954
765
27
526
77
66
6,344
2,487
521
76
.286
.376
.454
.830
9Indians
Indians
.694
1995
100
44
144
5,028
840
1,461
279
23
207
803
542
35
766
132
53
5,684
2,407
509
31
48
40
128
.291
.361
.479
.839
10Athletics
Athletics
.693
1929
104
46
151
5,204
901
1,537
288
75
122
845
540
29
440
63
42
5,987
2,341
485
214
.295
.365
.450
.815
11Cardinals
Cardinals
.688
1942
106
48
156
5,422
755
1,454
282
69
60
680
551
22
505
71
6,125
2,054
411
130
90
.268
.338
.379
.717
12Dodgers
Dodgers
.685
2022
111
51
162
5,526
847
1,418
325
31
212
812
607
56
1,374
98
18
6,245
2,441
568
3
53
22
85
.257
.333
.442
.775
13Dodgers
Dodgers
.682
1953
105
49
155
5,373
955
1,529
274
59
208
887
655
35
686
90
47
6,138
2,545
541
75
115
.285
.366
.474
.840
14Cardinals
Cardinals
.682
1944
105
49
157
5,474
772
1,507
274
59
100
722
543
27
471
37
6,168
2,199
433
124
96
.275
.344
.402
.745
15Cardinals
Cardinals
.682
1943
105
49
157
5,435
679
1,515
259
72
70
638
428
19
437
40
6,055
2,128
401
173
92
.279
.334
.392
.725
16Red Sox
Red Sox
.675
1946
104
50
156
5,318
792
1,441
268
50
109
737
687
15
661
45
36
6,126
2,136
427
106
133
.271
.356
.402
.758
17Dodgers
Dodgers
.675
1942
104
50
155
5,286
742
1,398
263
34
62
678
572
14
485
81
5,991
1,915
359
119
95
.264
.338
.362
.700
18Braves
Braves
.675
2026
27
13
40
1,381
221
374
72
5
55
216
128
13
316
21
10
1,537
621
132
1
14
4
23
.271
.335
.450
.785
19Cubs
Cubs
.675
2026
27
13
40
1,364
215
348
64
6
51
198
191
19
317
26
4
1,591
577
121
3
14
8
26
.255
.351
.423
.774
20Orioles
Orioles
.673
1969
109
53
162
5,518
779
1,465
234
29
175
722
634
43
806
82
45
6,328
2,282
438
74
59
62
138
.265
.343
.414
.756
21Yankees
Yankees
.673
1961
109
53
163
5,559
827
1,461
194
40
240
781
543
35
785
28
18
6,239
2,455
474
57
45
45
120
.263
.330
.442
.771
22Yankees
Yankees
.669
1954
103
51
155
5,226
805
1,400
215
59
133
747
650
20
632
34
41
6,027
2,132
407
84
47
94
.268
.348
.408
.756
23Yankees
Yankees
.669
1942
103
51
154
5,305
801
1,429
223
57
108
744
591
29
556
69
33
6,009
2,090
388
84
103
.269
.346
.394
.740
24Rays
Rays
.667
2020
40
20
60
1,975
289
470
105
12
80
274
243
28
608
48
9
2,260
839
197
0
14
9
38
.238
.328
.425
.753
25Red Sox
Red Sox
.667
2018
108
54
162
5,623
876
1,509
355
31
208
829
569
55
1,253
125
31
6,302
2,550
594
7
48
38
130
.268
.339
.453
.792
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