KAO Roomchang faces Sarim Vanthan, and Loek Vibol meets Keo Bunheng at the TV5 boxing arena in Takhmao Sunday for the last round of preliminaries in the 63.5-kilogram championship sponsored by K-Cement. Though the first match is relatively insignificant, with Kao Roomchang already qualified for the semifinals and his opponent already out, the second crucial bout sees veteran Loek Vibol making his 80th appearance in the ring against the 23-year-old from Preah Khan Reach club.