<page_title> List of World Extreme Cagefighting champions </page_title> <section_title> Middleweight Championship </section_title> <table> <cell> Brazil Paulo Filho def. Joe Doerksen <col_header> Name </col_header> <row_header> 3 </row_header> </cell> <cell> 1. def. Chael Sonnen at WEC 31 on Dec 12, 2007 in Las Vegas, NV, USA <col_header> Defenses </col_header> <row_header> 3 </row_header> </cell> </table>
In December 2007, Sonnen fought against Paulo Filho for the WEC Middleweight Championship.