STAR junior girl squash player Rebecca Chiu Wing-yin faces the biggest challenge in her fledgling career when she lines up against the world's best in the Pak Fah Yeow Open next month. The 14-year-old Jockey Club Ti-I College pupil has been given a wild card into the main draw of the US$25,000 (HK$195,000) tournament, thanks to the absence of Hongkong champion Dawn Olsen. Organisers of the event are awarded two wild cards for local players and these were to be given to the two leaders of the domestic Grand Prix series - Olsen and Catherine Radcliffe. Former circuit professional Olsen, however, has surrendered her ticket for the tournament to take a pet grooming course in England. ''It's unfortunate Dawn will miss the Open but she must go for the course as she wants to open a pet shop in the summer,'' said her mother, Jan, the assistant executive officer with the Hongkong Squash Racquets Association. Olsen's absence had opened the doors for Rebecca, the second runner-up at the Asian Junior Championships earlier this year, to make her debut among the sport's leading professionals. Eight of the world's top 10 women players have confirmed their participation, with the two exceptions being No 1 Michelle Martin of Australia and Britain's world No 6 Lisa Opie. Top 10 players entered are Martine le Moignan, Cassie Jackman, Liz Irving, Sue Wright, Suzanne Horner, Heather Wallace, Sarah Fitzgerald and Fiona Geaves.