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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OBP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Guillermo Romero | .5385 | 2016-2020 | |
| 2 | John Downing* | .5222 | 2015-2034 | |
| 3 | Tomás Gonzáles | .5000 | 2017-2021 | |
| 3 | Adrián Gómez | .5000 | 2028-2044 | |
| 3 | Bill Taylor | .5000 | 2022-2023 | |
| 6 | Noel Ballard* | .4933 | 2017-2031 | |
| 7 | Sadatake Abe | .4925 | 2039-2040 | |
| 8 | José Rodríguez | .4828 | 2018-2020 | |
| 9 | Jason Nicholson | .4773 | 2015-2019 | |
| 10 | Pedro Willis | .4730 | 2015-2022 | |
| 11 | George Valentine | .4722 | 2015-2020 | |
| 12 | Michael Malloy# | .4706 | 2027-2045 | |
| 13 | Mike Ríos# | .4676 | 2041-2043 | |
| 14 | Obidiah Lewis | .4632 | 2028-2042 | |
| 15 | Melvin Castro* | .4603 | 2019-2030 | |
| 16 | Miguel Gazivoda | .4600 | 2030-2037 | |
| 17 | Joey Coco# | .4531 | 2034-2040 | |
| 18 | Tomás Muinos# | .4524 | 2036-2041 | |
| 18 | Yoshihito Samurakami | .4524 | 2030-2033 | |
| 20 | Preston Witt | .4505 | 2031-2038 | |
| 21 | Johan Kroening# | .4500 | 2032-2041 | |
| 21 | Chris Nelson | .4500 | 2018-2022 | |
| 23 | Ed Anderson | .4495 | 2015-2025 | |
| 24 | Bryan Manning | .4492 | 2018-2020 | |
| 25 | Shimei Miura | .4478 | 2033-2044 | |
| 26 | Billy Dotson | .4474 | 2030-2044 | |
| 27 | Ron Bascombe | .4468 | 2017-2026 | |
| 27 | Adam Clements# | .4468 | 2038-2043 | |
| 29 | Pancho García | .4444 | 2017-2022 | |
| 29 | José Peña | .4444 | 2016-2020 | |
| 29 | Qing-nian Zexian# | .4444 | 2038-2044 | |
| 32 | Chad Armstrong* | .4437 | 2016-2027 | |
| 33 | Ben Ross | .4430 | 2015-2022 | |
| 34 | Thomas Dunlap | .4419 | 2017-2020 | |
| 35 | Michael Neely | .4400 | 2016-2029 | |
| 36 | Eddie Flynn | .4390 | 2022-2032 | |
| 36 | Chan-ho Shinn# | .4390 | 2041-2044 | |
| 38 | Mal Bussard | .4386 | 2017-2020 | |
| 39 | Marcus Shill# | .4384 | 2037-2043 | |
| 40 | Jonas van Claveren# | .4375 | 2035-2043 | |
| 41 | Luis Muñóz | .4366 | 2018-2026 | |
| 42 | Kumanosuke Abe | .4364 | 2024-2032 | |
| 43 | Steve Ingram | .4359 | 2016-2029 | |
| 44 | Tony Calhoun# | .4348 | 2036-2045 | |
| 45 | Jeff Walsh | .4336 | 2015-2021 | |
| 46 | Harry Fuller | .4333 | 2016-2026 | |
| 46 | Francisco González | .4333 | 2016-2019 | |
| 48 | Carlos Ortega | .4318 | 2018-2024 | |
| 49 | Lionel McCloud | .4298 | 2028-2035 | |
| 50 | Lawrence Bell | .4286 | 2018-2023 | |
| 50 | César Durán | .4286 | 2019-2023 | |
| 52 | Ángel Saelices# | .4270 | 2042-2045 | |
| 53 | Jake Hutchinson | .4262 | 2019-2026 | |
| 53 | Tadayoshi Watanabe | .4262 | 2034-2042 | |
| 55 | Tony Dyer* | .4250 | 2016-2025 | |
| 55 | Carlos Vera | .4250 | 2015-2021 | |
| 57 | Brian O'Brian | .4231 | 2015-2022 | |
| 58 | Omar Gutiérrez | .4222 | 2017-2017 | |
| 58 | Jesús Vargas# | .4222 | 2029-2043 | |
| 60 | Robbie Roach | .4219 | 2016-2028 | |
| 61 | Donald Thompson | .4216 | 2016-2025 | |
| 62 | José Arras# | .4215 | 2041-2045 | |
| 63 | Glyn Bolasky | .4203 | 2029-2040 | |
| 64 | Guillermo Montoya | .4189 | 2016-2021 | |
| 64 | José Rodríguez | .4189 | 2028-2040 | |
| 66 | Kenzaburo Hori | .4182 | 2019-2027 | |
| 67 | John Wilkerson# | .4179 | 2043-2045 | |
| 68 | Bill Chambers* | .4167 | 2016-2018 | |
| 69 | Urs van Munster | .4159 | 2030-2040 | |
| 70 | Luis Rodríguez | .4151 | 2015-2023 | |
| 70 | Menno van de Vlugt | .4151 | 2026-2033 | |
| 70 | Thom Wilcox* | .4151 | 2017-2027 | |
| 73 | Huibrecht Bloemheuvel# | .4146 | 2040-2045 | |
| 73 | Juan González | .4146 | 2022-2027 | |
| 73 | Joram Nelen | .4146 | 2023-2029 | |
| 73 | Sergio Vásquez | .4146 | 2033-2039 | |
| 77 | Carlos Rodríguez | .4143 | 2017-2018 | |
| 78 | Jonathan Cook | .4138 | 2019-2030 | |
| 79 | Oasiz Wiesblatt# | .4134 | 2041-2044 | |
| 80 | Braxton Cottongame# | .4130 | 2042-2045 | |
| 80 | Tim Stinson | .4130 | 2033-2042 | |
| 82 | Tim Barnes | .4125 | 2017-2026 | |
| 82 | Manoo Satyavrat | .4125 | 2027-2043 | |
| 84 | Victor Adams | .4120 | 2023-2032 | |
| 85 | John Aston | .4118 | 2024-2028 | |
| 85 | Tosya Mndoyants# | .4118 | 2043-2043 | |
| 85 | Mike Silver* | .4118 | 2015-2023 | |
| 88 | Jorge Barrios | .4115 | 2025-2035 | |
| 89 | José Corona | .4114 | 2033-2038 | |
| 90 | John Ennis | .4105 | 2027-2034 | |
| 91 | Ashley Thachi | .4087 | 2037-2044 | |
| 92 | Tamasaburo Kato* | .4085 | 2030-2037 | |
| 93 | Gerald Kaufman | .4082 | 2028-2034 | |
| 93 | Shun Komatsu | .4082 | 2036-2042 | |
| 95 | Casey Cavell | .4074 | 2026-2036 | |
| 95 | Pablo Marrero | .4074 | 2027-2032 | |
| 97 | Ray Sears* | .4071 | 2017-2027 | |
| 98 | Loring Rommel# | .4070 | 2041-2045 | |
| 99 | Brad Elmore | .4068 | 2015-2025 | |
| 100 | Alexis Hines# | .4058 | 2042-2044 |
