Schoolgirl Sze Hang-yu will be one of the first Hong Kong athletes to taste Olympic action when she competes in the women's 100 metres butterfly heats in Athens tomorrow morning. The 16-year-old Diocesan Girls' School student will step up to the kickboard at 10.30am (3.30pm Hong Kong time). The 100m butterfly is only the second event on the first day of the swimming competition. Hang-yu booked her place in the Olympics with fast times in both the 100m butterfly (1:02.08) and the 200m freestyle (2:04.97). The only male member of the swimming squad, Tam Chi-kin, 24, will race in the men's 100m breaststroke heats about two hours later. Hong Kong's top swimmer Sherry Tsai Hiu-wai, 21, who will carry the Hong Kong flag in tonight's opening ceremony, will make her first appearance on Sunday at 10am in the 100m backstroke. Heep Yunn School's Yip Tsz-wa, 13, will take part in the 100m breaststroke at 10.50am on Sunday. Cycling ace Wong Kam-po is in tomorrow's road race, one of the first medals to be awarded at the Olympics. The course is a tricky 13.1-kilometre loop through downtown Athens and alongside the historic Acropolis that the cyclists will cover 17 times. The race starts at 12.45pm and will last for several hours. Hong Kong's best medal hopes are ace windsurfer Lee Lai-shan and men's table-tennis duo, Ko Lai-chak and Li Ching, who are seeded third. San San starts her week-long competition, the women's mistral, on Sunday. Ko and Li also begin their bid for glory on Sunday morning. 'We hope we can win a medal or two,' said Victor Hui Chun-fui, chef de mission for the Hong Kong squad. 'I don't want to put too much pressure on the athletes by saying where our expectations lie. But, of course, we hope San San can do well.' In badminton, Wang Chen will need to overcome her illness if she is to progress from the first round of the women's singles. Wang, who is currently taking medication to combat hyper-thyroidism, will meet Peruvian Lorena Blanco tomorrow at 3pm. A win will see Wang meet the winner of the match between Yao Jie of the Netherlands and Jiang Yanmei of Singapore in the second round on Sunday. If she gets past that hurdle, Wang will come up against Zhang Ning, 29, winner of the World Championship and also the Hong Kong Open last year. Also in action tomorrow is fencer Lau Kwok-kin, who will compete in the men's individual sabre. His event starts at 10am.