COTABATO CITY -- All is set for the most awaited Clash of Champions, also known as Cotabato City's CoC, this evening at the Cotabato City State Polytechnic College Gymnasium.It will be a clash of champions in Cotabato City's singing talents who are all certified professional singers.Jeff Mendez, CoC producer and director, said eight finalists will outsmart each other in a competition that defines Cotabato City's singing industry.The grand showdown will featureClarissa Oliva, Hero Salik, Haanah Tiboron,