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| Progressive On-Base Pct Leaderboard | |
| This table is a snapshot of the career, single-season, active, and yearly leaders at the end of each season. | |
| * - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement. Bold - Indicates active player |
| Year | Career | OBP | Single-Season | OBP | Active | OBP | Yearly | OBP |
| 2003 | Thuralia Nilad | .4632 | Thuralia Nilad | .4632 | ||||
| 2004 | Thuralia Nilad | .4774 | Thuralia Nilad | .4774 | ||||
| 2005 | Thuralia Nilad | .4820 | Thuralia Nilad | .4820 | ||||
| 2006 | Thuralia Nilad | .4820 | Gandaudur Eowöldor | .4444 | ||||
| 2007 | Grukak Dwarfcrawler | .4292 | Thuralia Nilad | .4820 | Grukak Dwarfcrawler | .4292 | Boran Armormasher | .4604 |
| 2008 | Thuralia Nilad | .4510 | Thuralia Nilad | .4820 | Thuralia Nilad | .4510 | Loopy *squishmasher | .4271 |
| 2009 | Thuralia Nilad | .4430 | Thuralia Nilad | .4820 | Thuralia Nilad | .4430 | Loopy *squishmasher | .4288 |
| 2010 | Thuralia Nilad | .4369 | Thuralia Nilad | .4820 | Thuralia Nilad | .4369 | Curt Ballscarer | .4460 |
| 2011 | Thuralia Nilad | .4356 | Thuralia Nilad | .4820 | Thuralia Nilad | .4356 | Loopy *squishmasher | .4139 |
| 2012 | Thuralia Nilad | .4229 | Thuralia Nilad | .4820 | Thuralia Nilad | .4229 | Trik *rider | .4336 |
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