Outstanding teenage amateurs Minjee Lee and Lydia Ko are set to fight it out with rising professional star Caroline Hedwall in the final round of the NSW women’s golf Open.

Australian amateur champion Lee, 16, didn’t notch a single bogey through the first two rounds in posting scores of 66 and 69 at the Oatlands course in western Sydney.

She shared the lead at nine under with 2011 NSW open winner Hedwall, the highest world ranked professional in the field, who shot a second round 69 in gusty conditions on Saturday afternoon.

They will play in the final group on Sunday alongside 15-year-old New Zealander and defending champion Ko, who is on eight under, after birdying two of the last three holes for a 69.

“It’s fun that amateurs are up there too and they are really great players, so it will be tough tomorrow,” said Hedwall, whose round included an eagle three and an eight metre par putt on the last.

“The wind really picked up in the back nine. It was tough out there, it was hard to get close to the pins.”

Australians Kristie Smith and Sarah Jane Smith are back on six under after each shot a 70.

Two more home golfers Stacey Keating and Bree Arthur, who shared the first round lead with Hedwall and Lee dropped back to five under after both carded a 73.

Another Australian, Stephanie Na is also on five under after shooting 71.

Late on day two there was talk some players including France’s Jo Klatten who shot a 67, the lowest round of the day, and Britain’s Laura Davies, both at four under, would be disqualified for using facilities for practice during the tournament which were only supposed to be used before it started.

The committee found out several other players had done the same thing and decided against disqualifying anyone as they had not made the situation clear enough.

Lee, the world No.3 ranked amateur, who is playing just her fifth professional tournament, refused to get too excited about her lofty position.

“Its just like any another tournament, you’re up against everyone else, you’re fighting yourself technically,” said Lee, who birdied three straight holes on the front nine.

Ko’s storming finish, kept the world No.1 ranked amateur in contention for back-to-back NSW Open titles.

“It feels welcoming this golf course and I have played good here,” Ko said.

“I think if I get my putts rolling I’ll be able to shoot lower scores which I haven’t been doing the last two days, but 67-69 is a pretty good score.”

Victorian Elissa Orr collected $500 for a hole-in-one on the par three 12th.