Star duo Cheung Wai-yi and Chan Tzee-kwan showed their mettle before next month's China National Games by winning gold in their respective categories in yesterday's Hong Kong Championships at the Pei Ho Street Sport Centre in Shum Shui Po. They will be the only Hong Kong representatives in the National Games, which kick off onOctober 10 in Nanjing. Cheung, 24, took first place in the women's -63kg category with four straight victories by reaching 10 points, the full marks in a game. Chan, 20, also won her first three matches in the women's -57kg category with full marks, but faced a tough opponent in fellow team member Kwok Kit-fong in the finals. The two were evenly matched and neither was able to score during the regulation four-minute time, sending the match to sudden-death overtime. Although there were many close calls, the scoreboard remained empty after the extra-time and Chan was awarded the win on a 2-1 decision by the judges. Hong Kong's Japanese head coach Hiroomi Fujita said Chan should have won the match on penalty points much earlier. 'Both of them were evenly matched but Chan was attacking the whole time while Kwok remained on the defensive,' said Fujita. 'Defence is no good. In international competition Kwok would have been assessed a penalty three times during that match [for lack of attacks].' Fujita said he was confident that the star duo can earn a medal in Nanjing. 'They have a strong drive to improve and they train very hard,' he said. 'In a month they can be much better.'