<page_title> List of undefeated boxing world champions </page_title> <table> <cell> Middleweight <col_header> Weight class </col_header> </cell> <cell> WBO <col_header> Title(s) </col_header> </cell> <cell> 2010–2012 <col_header> Championship years </col_header> </cell> </table>
Dmitry Pirog won the WBO middleweight title from 2010 to 2012 and retired undefeated.