The main action kicks off today, but some of the SAR's junior stars will be missing from the opening round of the Buler Challenge Cup, a professional tournament being held at the Hong Kong Squash Centre this week. Up-and-coming young players, including Leung Shin-nga and Chiu Ka-kei - both of Belilios Public School - crashed out in the first qualifying round, while Jockey Club Ti-I College's Annie Au Wing-chi and Joey Chan Ho-ling faced tricky second-round matches last night. Four of the 16 hopefuls who entered the qualifiers will advance to today's 16-player main draw, which includes international stars. The winners of last night's second-round qualifiers will come up against top players, such as New Zealand's Shelley Kitchen (world number 16) and Tamsyn Leevey (25), Tegwan Malik of Wales (23), and Australia's Amelia Pittock (29) and Melissa Martin (31). In the men's competition, schoolboy Chiu Ho-fai reached last night's second qualifying round, where he was due to meet former Hong Kong champion Faheem Khan. Last year Ho-fai caused an upset when he reached the second round of the main tournament. Last night, another schoolboy, Max Lee Ho-yin, was scheduled to play Japan's Ysunori Ishiwata for a place in the main draw. The event, which offers total prize money of $160,000, ends on Sunday. It has attracted 16 of the world's top 100 women players, including Hong Kong's number one, Rebecca Chiu Wing-yin, who is the second seed in the main draw. Chiu, who is ranked 17 in the world, will face Delia Arnold of Malaysia (world number 52) in the first round today. In the men's category, defending champion Wong Wai-hang of Hong Kong is the top seed. Wong has the highest world ranking - 70 - among the male participants. The girls, Annie, Joey, Ka-kei and Shin-nga, made up the Hong Kong team who won two prestigious titles - the Asian and world junior team championships - last year. Shin-nga lost to her teammate Annie in five games on Tuesday, while Ka-kei was beaten by the more experienced Rachel Smith of Australia. Four other Hong Kong girls - Dorothy Ko Sin-ting, Karla Chong Man-kiu, Carmen Lee Ka-man and Liu Tsz-ling - were beaten in the first round of the qualifying competition. Hong Kong boys Lau Siu-nam, Fung Ji-yang, Alan Tsang Hon-yin, Angelo Wong Kwok-tung and Leo Au Chun-ming also failed to book their place in the main draw after losing out in the qualifiers.