Hong Kong's young sprinters are battling nerves as they confront the prospect of clinching a medal in the men's 4x100 metres relay event. 'There's no problem with the more experienced runners, but I felt that the younger and newer ones are quite nervous,' Hong Kong athletic coach Yu Lik explained. 'This is because the athletes here are all very strong.' Four years ago, the men's relay team of Chiang Wai-hung, To Wai-lok, Tang Hon-sing and Ho Kwan-lung won the silver medal at the Guangzhou games. To and Chiang remain from the old squad, but the coach revealed yesterday that talented 19-year-old sprinters Tang Yik-chun and Leung Chun-wai would join the team for the preliminary tomorrow night at the Olympic Stadium in Nanjing. Leung will lead off, followed by To and Tang with Chiang running the anchor leg. Hong Kong will meet strong teams from Shanghai - spearheaded by Olympic 110m hurdles champion Liu Xiang - Guangxi, Guangdong, Zhejiang and Sichuan. 'We ranked fourth in the qualifier, and indeed all the teams are equally strong so it depends on how well they perform that day,' coach Yu said, adding that it would be an advantage for Hong Kong to race at night - the time they were usually training. He added that racing against world-class athletes like Liu Xiang was a daunting prospect for the youngsters. To better prepare for the relay heat, which will be held tomorrow night, To will give up the 100m preliminary this morning. On the tennis court, the SAR's aces Wayne Wong and Yu Hiu-tung failed to perform to their usual standard and lost out in the quarter-finals of the men's singles yesterday. Wong had a hard time against top seed Wang Yu of Tianjin, crashing to a 6-2, 6-1 defeat at the Olympic Stadium tennis court in Nanjing. 'I didn't get hold of the chance when I scored 30 or 40 in some sets,' a discouraged Wong said. 'And the injury in my right shoulder hindered my performance.' Wong said he might withdraw from the fifth-to-12th place play-offs because of the nagging injury. Yu's hopes of clinching a medal also vanished when he was beaten, 6-1, 6-0 in 50 minutes by another Tianjin player, second-seeded Sun Peng. Sun was hardly challenged by lacklustre Yu. 'We are of similar level but today, he played very well - better than usual - while I had a poor performance,' said a very disappointed Yu. Hong Kong shooting ace Wong Fai's chance of a medal in the 10m air pistol final was extinguished after posting a sub-par first score of 85. Although he strove hard to make up the lost ground, shooting beautifully for scores of 99 and a 98, the damage had been already done and he trailed in 48th place overall with a total score of 571.