After Venus Williams beat Caroline Wozniacki at the Dubai Duty Free Tennis Championships, it looked as if a first all Williams tennis final in five years was on the cards. But someone forgot to tell Alize Cornet. The Frenchwoman stunned a sluggish Serena Williams in the second semifinal Friday, meaning a Williams versus Williams clash for silverware -- they haven't met in a finale since the year-end championships in 2009 -- will have to wait. It was Serena Williams' first tournament since a back