Fabricio Werdum wasn't exactly the most talked about heavyweight on the planet after getting knocked out in Junior dos Santos' UFC debut and then sent packing from the promotion. Werdum would see his name value skyrocket in June of 2010 when he became the first man in almost ten years to defeat Fedor Emelianenko. The loss to dos Santos also looked better once Junior established himself as the top heavyweight in the world, now holding the UFC title.
Nelson's (16-6) UFC tenure was teetering on the brink following back-to-back losses to Junior dos Santos and Frank Mir, but he bounced back strong in his most recent fight. Nelson took the fight to Mirko "Cro Cop Filipovic at UFC 137, likely ending the Croatian's career via a third-round TKO stoppage.
This is a great test for both men as both have decent striking but very solid grappling skills. It's likely to turn into a striking match with Werdum's better technique against Roy's bigger power.