TEENAGE squash star Jackie Lee Chun-kit succumbed to the tight playing schedule at the Junior World Championships that is still going on in New Zealand and is suffering from a sore back. Jackie kept the territory's colours flying high in the individual competition last week when he reached the quarter-finals before bowing out to third-seeded Egyptian Omar El Borollosy. His sterling performance in the tournament boosted Hong Kong's confidence for the team event in which they kicked off on a high note by blanking Scotland 3-0. But the Hong Kong team was sent crashing down to earth in their next outing when they narrowly went down 1-2 to South Africa, with Jackie losing the deciding rubber in five games. Wong Wai-hang had given the territory a most promising start against South Africa with a straight games triumph over Craig Ruang but his brother Wong Wai-chung was beaten 0-3 by Farice Ruscoe in the second rubber. However, much to the Hong Kong camp's despair Jackie failed to overcome the pain in his back in the deciding match and lost to South Africa's Grant Findlay in five games. Hong Kong were crippled by the unavailability of Jackie in their final group match against Pakistan as the Asian junior champion had to be rested because of his back injury. His absence proved too huge an obstacle for the Hong Kong team to overcome and they were whitewashed by the Pakistanis, a defeat which relegated them into the play-off for ninth to 16th positions. TAM Kai-chuen and Liu Kwok-wah did Hong Kong proud at the Prince Asian Junior Badminton Invitational Tournament when they overcame stiff opposition to win their respective age groups. Seventeen-year-old Kai-chuen, who will be flying the territory's colours at next week's Commonwealth Games in Canada, lifted the under-18 crown while Kwok-wah triumphed in the under-16 category. Kai-chuen breezed into the final with convincing victories in his first three matches, including a commendable win over Malaysian number one Jason Wong in the semi-finals. The talented Hong Kong youngster faced a much stiffer challenge in the title decider against top-seeded Chen Chyung-fung of Taiwan, scrapping through the opening game 17-16. They again battled to a deuce in the second set but this time it was the Taiwanese who prevailed, winning three straight points to push the match the full distance. However, Chyung-fung cracked up under pressure in the deciding final set and the steadier Kai-chuen coasted to a 15-5 victory. Kwok-wah proved to be in a class of his own against the under-16 company when he clinched the title without dropping a set. The aggressive 15-year-old crushed a Filipino and two Taiwanese opponents on his way to the finals against strongly fancied Guo Jianhua of China. He overcame a jittery start to force a deuce in the opening set and smashed his way to an 18-14 victory. With confidence restored, Kwok-wah never allowed his opponent back into the match as he quickly wrapped up the second set 15-6.