Hong Kong are on the verge of winning promotion to the Fed Cup Asia/Oceania Group I after teenagers Lynn Zhang Ling and Jessica Yang Zi-jun continued their unbeaten run in Perth by storming to a 3-0 win over Singapore yesterday. Zhang (pictured) and Yang didn't drop a set against their opponents winning both their individual singles matches as well as the doubles, and repeated their 3-0 thrashing of Iran earlier in the round robin stage in Group II. But the real test will come today when they face Kazakhstan in the final tie to decide promotion into Group I next year. 'It is going to be tough. The Kazakhstan girls are both ranked in their 70s in the world while our highest ranked player, Lynn, is only in the 300s,' said Janet Hardisty, Hong Kong Tennis Association's general manager. 'But we hope they can rise to the occasion and do well. It would be great for Hong Kong to win back their place in Group I next year.' Yang defeated Celina Cassandra Goetti of Singapore 6-2, 6-1 in the opening singles and this was followed by Zhang's 6-0, 6-1 victory over Tan Li Yun. The Hong Kong duo then combined well to thrash Julienne Si Ying Keong and Carolyn Ann Lim Hui 6-0, 6-0 in the doubles. Kazakhstan also remained unbeaten in the round robin competition, hammering Iran 3-0.