West Australian Hannah Green is in contention after the opening round of the LPGA Tour's Volunteers of America Classic after shooting a three-under 68.
The 2019 Women's PGA Championship winner, is five behind runaway leader Stephanie Meadow, who had five straight birdies on the front nine in hot and humid conditions in Texas on Thursday.
After making a lightning start with birdies in her opening two holes, Green made bogey on the 5th before recovering with birdies on the 6th, 9th and 17th.
The 22-year-old from Perth was on track for a spot in the top seven before closing with another bogey to drop her into a tie for 14th.
Fellow Australians Katherine Kirk and Sarah Kemp have their work cut out for them to make the weekend after posting 73 and 74 respectively.
But there were no such problems for Meadow, the 27-year-old former University of Alabama player from Northern Ireland who is seeking her first Tour victory.
She began the birdie run on the par-5 2nd and capped it on the par-5 6th in mid-90-degree heat at Old American Golf Club.
"Sticky. I'm pretty hot, but it was a great day," Meadow said. "I hit the ball really well, putted really nicely, so it's a good start.
"I made kind of three medium-length ones in a row and then like I hit two really good shots in there on the next two holes and made those," Meadow said.
"So, a little bit of putting and a little bit of really good ball-striking. But it's been a while since I've put five in a row, which is fun. You don't want to stop after three, you want to keep going."
Meadow also birdied the par-5 13th, the par-4 15th and par-3 16th in the bogey-free afternoon round.
"It's been a pretty tough year, but I've been playing well the last few months, so I just feel like if I can just have a good week," Meadow said.
"I have nothing to lose. I'm just going to go out there, make smart choices. I'm not going to be stupid aggressive, but give myself some opportunities. I believe in myself and we'll see what happens."
Dori Carter and Amy Olson were tied for second at 65.
Cheyenne Knight, Ruixin Liu and Moriya Jutanugarn shot 66.
Inbee Park, the 2013 and 2015 winner at Las Colinas Country Club, was another stroke back with US Women's Open champion Jeongeun Lee6, Brittany Altomare, Jaye Marie Green, Katherine Perry, Kristen Gillman and Gaby Lopez.