Thailand's Jaidee, the winner of the 2001 Order of Merit on the Davidoff (Asian PGA) Tour, which is co-sanctioning this event with the European Tour and Australasian Tour, remained at 5-under after shooting an even-par 72.
Early starter Steve Alker of New Zealand fashioned the tournament's best round in the calmer morning conditions. His bogey-free, 7-under 65 was 10 shots better than his opening score and lifted him into third place at 4-under.
Sweden's Pierre Fulke, the runner-up in last year's WGC-Accenture Match Play Championship in Melbourne, carded a 70 to join world No. 4 Sergio Garcia in fourth at minus 2.
Garcia salvaged a poor start to his round Friday with three birdies over the final five holes for a 1-over 73.
Ernie Els of South Africa had a 71 to move alongside Australian Craig Jones, who turned in a 72. At 1-under 143 they were the only other players under par through 36 holes.
'It's like playing a major out there really,' said Els, who won the 1997 Johnnie Walker Classic at Hope Island in Queensland the only other time the event was held in Australia. 'It is like a U.S. Open or a very difficult Masters. Some of those bunkers seem like they are almost in the fairways, so it is very difficult to keep the ball in play.'
Although only 17 players managed to shoot sub-par scores in round two, it was still three more than were posted in Thursday's swirling winds.