FAST-RISING Wong Wai-hand is on course for a clean sweep of all four legs of the men's under-18 Hi-Tech Grand Prix series with a 3-0 demolition of Yiu Wai-ming at the Hongkong Squash Centre yesterday. Wong, who beat Asian junior champion Jackie Lee Chun-kit in the finals of the three earlier tournaments, took only 20 minutes to crush a hapless Yiu 9-0, 9-4, 9-2. ''Winning this final leg is very important for me because nobody has ever won all four tournaments in the series,'' said the 16-year-old, who is already assured of the overall championship. ''But it won't be easy because I'll have to play John Choi Wing-yiu tomorrow and probably against Jackie again in the final on Sunday,'' he said yesterday. Third-seeded Choi, the oldest in the eight-player field at 18, dropped a game to Yan Tsz-keung before winning 9-5, 9-1, 7-9, 9-4. Wong's younger brother, Wai-chung, also advanced by beating Cheung Cheuk-yin 9-7, 9-5, 9-2 but he is unlikely to give Lee a serious challenge in today's semi-final. Lee got a walkover from Wong Kin. The women's tournament has been thrown wide open in the absence of undisputed Hongkong number one Dawn Olsen, who is in England to take a pet grooming course. Top seed Catherine Radcliffe, who will be flying the territory's colours at the Pak Fah Yeow Open later this month, overcame a lapse of concentration in the third game to beat Lynn Burke 9-2, 9-8, 2-9, 9-1. She should encounter even less trouble in her quarter-final against Polly Yu Ting-wah, who stopped Sandy Chan Suk-wah 6-9, 9-5, 9-3, 9-0. But Eunice Bond, the third leg winner, could give Radcliffe a good run in the afternoon's semi-final if they both live up to their seedings. Bond was in a mean mood as she overwhelmed Tsoi Kit-man 9-1, 9-0, 9-1 and she should also prove too good for veteran Hongkong international Ann Chan Yuk-ngan, who beat junior Rebecca Hawkes 9-4, 9-1, 9-5. Top juniors Rebecca Chiu Wing-yin and Sally Hawkes, the second and third seeds respectively, marched on without any serious problems. Chiu, who was also awarded a wild card for the Pak Fah Yeow Open, humbled full-time squash coach Quize Chan Siu-ling 9-4, 9-3, 9-2 while Hawkes stopped Belinda Trought 9-5, 9-3, 7-9, 9-3. Chiu next plays Currie Siu Kit-bing.