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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OBP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Júlio López | .4134 | 2004-2013 | |
| 2 | Robert Fick* | .4021 | 1998-2007 | |
| 3 | Jason Kendall | .3873 | 1996-2012 | |
| 4 | Victor Martinez* | .3847 | 2002-2016 | |
| 5 | James Sims | .3810 | 2012-2019 | |
| 6 | Michael Barrett* | .3807 | 1998-2013 | |
| 7 | Ryan Doumit | .3764 | 2008-2025 | |
| 8 | Dave Anthony | .3746 | 2013-2024 | |
| 9 | Ray Craig# | .3699 | 2018-2031 | |
| 10 | Gregg Zaun | .3676 | 1995-2003 | |
| 11 | Nick Taylor | .3662 | 2015-2028 | |
| 12 | Ed Sprague Jr* | .3637 | 1991-2007 | |
| 13 | Buster Posey | .3629 | 2012-2024 | |
| 14 | Dave Tate | .3617 | 2012-2026 | |
| 15 | Joe Mauer* | .3597 | 2004-2021 | |
| 16 | Mike Piazza* | .3586 | 1992-2006 | |
| 17 | Jake Barkett | .3580 | 2013-2030 | |
| 18 | George E Williams | .3568 | 1995-2003 | |
| 19 | Rob Bowen | .3559 | 2005-2014 | |
| 20 | Matt Wieters | .3499 | 2012-2026 | |
| 21 | Jarrod Saltalamacchia | .3497 | 2008-2022 | |
| 22 | Dave Nilsson | .3488 | 1992-2002 | |
| 23 | Paul Griggs | .3478 | 2009-2027 | |
| 24 | Gabriel Hodge | .3469 | 2013-2029 | |
| 25 | Michael Foster# | .3443 | 2021-2031 | |
| 26 | Mark Thompson | .3440 | 2018-2026 | |
| 27 | Jorge Posada | .3436 | 1995-2007 | |
| 28 | Ben Davis | .3430 | 1998-2011 | |
| 29 | Todd Greene* | .3426 | 1996-2009 | |
| 30 | Baudilio Díaz | .3425 | 2007-2017 | |
| 31 | Flint Fox# | .3418 | 2021-2031 | |
| 32 | Joey Bart# | .3417 | 2022-2031 | |
| 33 | Brody Bailey | .3394 | 2007-2014 | |
| 33 | A J Pierzynski | .3394 | 1998-2010 | |
| 35 | Mike Sweeney | .3383 | 1995-2009 | |
| 36 | Ken Washington | .3367 | 2001-2013 | |
| 36 | Craig Biggio | .3367 | 1988-2004 | |
| 38 | Paul Hoover | .3348 | 2004-2014 | |
| 39 | Norm Rhodes | .3345 | 2017-2027 | |
| 40 | José Ramos | .3341 | 2002-2011 | |
| 41 | Eric Blue# | .3337 | 2020-2031 | |
| 42 | Paul Phillips | .3321 | 2006-2015 | |
| 43 | Ramon J Hernandez | .3320 | 1999-2014 | |
| 43 | Kurt Suzuki | .3320 | 2008-2015 | |
| 45 | Roberto Betancourt | .3308 | 2015-2029 | |
| 46 | Mitch Meluskey | .3302 | 1999-2009 | |
| 47 | Charles Johnson | .3297 | 1994-2008 | |
| 48 | Ivan Rodriguez* | .3295 | 1991-2009 | |
| 49 | Mike Redmond | .3290 | 1998-2005 | |
| 50 | Walt Dowds | .3287 | 2012-2025 | |
| 51 | Matt Walbeck | .3277 | 1994-2006 | |
| 52 | Javy Lopez* | .3272 | 1993-2007 | |
| 53 | Román Morán | .3252 | 2019-2031 | |
| 54 | Jon Gillespie# | .3250 | 2021-2030 | |
| 55 | Bengie Molina | .3247 | 1998-2009 | |
| 56 | Jason Johnson | .3240 | 2015-2025 | |
| 57 | Lawrence Summers | .3230 | 2016-2027 | |
| 58 | Eric Hart | .3227 | 2008-2018 | |
| 59 | Kelly Stinnett | .3221 | 1994-2003 | |
| 60 | Orlando Ortíz | .3210 | 2009-2021 | |
| 61 | Matt LeCroy | .3169 | 2000-2009 | |
| 62 | Manuel Vélez | .3166 | 2006-2015 | |
| 63 | Jason LaRue | .3164 | 1999-2015 | |
| 64 | Yadier Molina | .3158 | 2005-2018 | |
| 65 | Javier Valentin | .3151 | 1997-2010 | |
| 66 | Hector Villanueva | .3149 | 1990-2003 | |
| 67 | Chris Snyder | .3148 | 2005-2014 | |
| 67 | Jayhawk Owens | .3148 | 1993-2004 | |
| 69 | Myles Hodges# | .3145 | 2020-2031 | |
| 70 | Bob Hopper# | .3138 | 2024-2031 | |
| 71 | Josh Phelps | .3131 | 2002-2012 | |
| 72 | Jason Varitek | .3129 | 1999-2007 | |
| 73 | Dan Phillips# | .3047 | 2021-2031 | |
| 74 | Bobby M Estalella | .3033 | 1996-2004 | |
| 75 | Benito Santiago | .3007 | 1986-2003 | |
| 76 | Mike Lieberthal | .3005 | 1994-2006 | |
| 77 | Terry Schrader | .2857 | 2005-2014 |
