On a day when the field struggled with the afternoon swirling winds, the 23-year-old from Northamptonshire carded eight birdies and two bogies to sit two shots clear of her nearest challenger, Norway's Marita Engzelius.
Coonabarabran's Rebecca Artis is the leading Australian in a share of third place and five shots behind MacLaren who said her 65 was less than straightforward.
“It had a bit of everything in it,” MacLaren said after her round.
“I’ve been playing well, (hitting) controlled iron shots all week. I judged the wind pretty well today, and when you in control of your ball flight it is easy to handle.
“It felt like making bogeys the best part of the round,” She smiled.
MacLaren, who had pulled her own bag in the first two rounds, had a little bit of help arrive from the united Kingdom overnight. Her father, David, who she said might have been suffering from the effects of jet lag, caddied for her today.
“I think he needs a lie down now, he only got in from England like yesterday morning,” she smiled.
“It was great to have him there. He kept me calm talking about stuff that wasn’t related to my round, It was what I needed. I think I would have got a little bit edgy otherwise.”
MacLaren said she was hoping to keep her form going into tomorrow.
“This is the best I’ve felt with my game for quite a while,
“I am putting nicely and i don’t want to get distracted by all the noise outside, just focus on my own game and do what I have to do,” she said.
On a day when the wind made conditions noticeably tougher than the first two rounds, several players tried to challenge but most fell at one hurdle or another.
Swede Camilla Lennarth was the first to jump out from the chasing pack recording an eagle on the first hole and two more birdies on the outward nine. Sadly a double and three bogeys on her homeward nine saw her drop back to a tie for sixth.
Norways’ Marita Engzeluis carded a tidy three under par 68 to sit alone in second place, while a trio of players including first first round leader Silvia Banon, New South Wales' Rebecca Artis and Thai player Pannarat are a further three back at five-under.
Artis, who is struggling with a cold, said it was a battle out there.
“I felt a bit flat today, just tried to stay patient and get it around," she said. “You’ve got to hit fairways and give yourself chances,
“ I didn’t hit the ball quite as well today, I missed a couple of fairways. I laid up on the par five in the rough, you just can’t do that.
“I gave myself a chance on 17. I didn’t capitalise, but then made a good par on 18 after leaving myself a tough two putt. It was a good two putt in the end.”
Artis believes she is in with a chance tomorrow and realises she will need to get away to a good start.
“If I can be somewhere within a couple (of shots of the leaders) on the back nine I won’t be too unhappy,” she said.
“It is hard out there in places. You have got to play some good golf to shoot a low round. The greens are nice, and if you can give yourself birdie opportunities you can make them.”
Second round leader Hannah Park, who admitted to some nerves on the first tee this morning, hung around at the top of the leaderboard most of the day. A disappointing triple bogey on the last soured an otherwise impressive effort from the 17 year old.
“I felt the pressure on the first couple of holes, but I got used to it, and made thee birdies on the back nine," she said.
Her disappointment with her finish was ovivous, however.
“I hit it O.B and made a triple the last,” she said.
Despite the final hole Snafu, Park is still in the mix, and when reminded it would only take another effort like her second round course record, Park smiled:
“Definitely, I will try my best!”
SIGNATURE HOLES - 7TH AT BAYVIEW GC SYDNEY:
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