highest on base percentage in a month

49 players are tied for the best on-base percentage in a month, with an on-base percentage of 1.000. The first three are Jonah Cox and Enrique Hernández last month and Luke Williams in April 2026.

Interpreted as:
highest on base percentage by a player in a month
NAMEOBPMONTHGABRH2B3BHRRBIBBHBPSOSBCSPATBXBHSHSFIBBGIDPAVGSLGOPS
1Jonah Cox
J. Cox
1.000
May 2026
1
1
1
1
1
0
0
0
0
0
0
0
0
1
2
1
0
0
0
0
1.000
2.000
3.000
2Enrique Hernández
E. Hernández
1.000
May 2026
2
4
2
4
2
0
1
2
0
0
0
0
0
4
9
3
0
0
0
0
1.000
2.250
3.250
3Luke Williams
L. Williams
1.000
April 2026
2
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
4Dylan Moore
D. Moore
1.000
March 2026
1
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
5Jack Winkler
J. Winkler
1.000
July 2025
2
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
6José Fermín
J. Fermín
1.000
June 2025
3
3
1
3
0
0
0
0
0
0
0
1
0
3
3
0
0
0
0
0
1.000
1.000
2.000
7José Tena
J. Tena
1.000
March 2025
1
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
8Miles Mastrobuoni
M. Mastrobuoni
1.000
March 2025
1
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
9Ryne Nelson
R. Nelson
1.000
March 2025
1
1
1
1
0
0
0
1
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
10Jacob Hurtubise
J. Hurtubise
1.000
March 2025
3
0
1
0
0
0
0
0
1
1
0
0
0
2
0
0
0
0
0
0
11Duke Ellis
D. Ellis
1.000
September 2024
3
1
0
1
0
0
0
0
0
0
0
1
0
1
1
0
0
0
0
0
1.000
1.000
2.000
12Joey Wiemer
J. Wiemer
1.000
August 2024
2
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
13Alika Williams
A. Williams
1.000
July 2024
1
0
2
0
0
0
0
1
0
1
0
0
0
1
0
0
0
0
0
0
14Jacob Wilson
J. Wilson
1.000
July 2024
1
1
1
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
15Ben Gamel
B. Gamel
1.000
June 2024
2
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
16Lenyn Sosa
L. Sosa
1.000
May 2024
1
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
17Ryan McKenna
R. McKenna
1.000
April 2024
2
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
18Travis Jankowski
T. Jankowski
1.000
March 2024
2
1
1
1
0
0
1
1
0
0
0
0
0
1
4
1
0
0
0
0
1.000
4.000
5.000
19Royce Lewis
R. Lewis
1.000
March 2024
1
2
1
2
0
0
1
1
0
0
0
0
0
2
5
1
0
0
0
0
1.000
2.500
3.500
20Victor Caratini
V. Caratini
1.000
October 2023
1
1
0
1
1
0
0
0
0
0
0
0
0
1
2
1
0
0
0
0
1.000
2.000
3.000
21Elias Díaz
E. Díaz
1.000
October 2023
1
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
22Matt Olson
M. Olson
1.000
October 2023
1
1
0
1
0
0
0
2
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
23David Peralta
D. Peralta
1.000
October 2023
1
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1.000
1.000
2.000
24Dominic Smith
D. Smith
1.000
October 2023
1
0
1
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
25Rowdy Tellez
R. Tellez
1.000
October 2023
1
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
0
StatMuse has game-level data for on-base percentage going back to the 1908 season.
Some of the information used here was obtained free of charge from Retrosheet.

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41
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.526
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40
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.506
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DATEMATCHUPTIME (ET)
Wed
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9:45 PM
Thu
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@
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Fri
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MLB 2026 Standings

NL EastWLPCTGB
48
30
.615
43
36
.544
5.5
41
39
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34
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NL CentralWLPCTGB
48
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.623
42
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.545
6.0
41
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.526
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39
40
.494
10.0
37
41
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NL WestWLPCTGB
51
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.638
41
37
.526
9.0
40
39
.506
10.5
32
46
.410
18.0
31
49
.388
20.0
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47
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43
33
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3.0
39
40
.494
8.5
38
43
.469
10.5
32
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.416
14.5
AL CentralWLPCTGB
41
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.526
41
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.513
1.0
38
43
.469
4.5
34
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.430
7.5
34
46
.425
8.0
AL WestWLPCTGB
41
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.513
38
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.481
2.5
38
41
.481
2.5
38
43
.469
3.5
33
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.407
8.5

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DATEMATCHUPSCORE
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7-5
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DATEMATCHUPTIME (ET)
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