In the second lightweight tournament match of the day, Kao Roomchang scored a knockdown with an overhand right in the second round against Vung Noy on his way to earning a decision victory Sunday at the CTN boxing area. The two lightweights stood toe-to-toe for most of five rounds, with Vung Noy cutting Kao Roomchang in the first with an elbow. But Kao Roomchang came charging back through the next four rounds, landing haymakers and beating a scrappy-but-overpowered Vung Noy around the ring.