Defending champions Thailand beat Viet- nam 3-1 in their last first-round match to top Group B at the SEA Games last night. It was Thailand's fifth successive win in the Singapore tournament, having beaten Laos, Timor Leste, Malaysia and Brunei in their earlier matches. It was relatively a meaningless match Y at Bishan Stadium, as both Thailand and Vietnam had already qualified for the semi-finals. However, the two regional football giants traded attacks to entertain a sell-out crowd