"I was just concentrating on making good shots and picking up my spares," said 22-year-old Ng, a full-time athlete with the Hong Kong National team.
"Bowling on home ground and in front of my supporters has given the inspiration to do well. I had a lucky bye in the first round and I got more comfortable as I conituned to make progress. I've to thank my coach, who has guided me along the way and also my team-mates."
The champion edged team-mate, Chan Shuk Han by 1 pin when won her second round match, 169-168 to reach the semi-final.
Ng went on to beat another fellow compatriot, Leung Mei Sheung 189-184 in an all-Hong Kong semi to set up a showdown with Yung in the final. Yung sailed pass Filomena Choi of Macau, 222-179 in the other semi to face Ng.
The runner-up rolled the highest game in the women's division when she beat compatriot, Sonia Ho 229-183 in the first round and another compatriot, Hazel Lam 180-169 in the second round.