Tseng sparkles at Women's Australian Open
The defending champion dropped just one shot yesterday at the second, scoring six birdies to move to 14 under par overall.
World No.1 Jiyai Shin is the nearest challenger after firing a four-under 69, with South Korea's Eun Hee Ji a further stroke back on 10 under and Katherine Hull of Australia in fourth after a stunning six-under-par 67.
Scot Clare Queen's third-round 76 left her tied 61st. Fellow Scots Carly Booth (75,77), Kylie Walker (84, 73), Krystle Caithness (84, 76) and Vikki Laing (83, 80) all missed the cut.