Australia's Minjee Lee has fired herself to within striking distance of the lead after day one at the LPGA Tour's Queen City Championship in Cincinnati, Ohio.
Starting her round with three successive birdies, Lee carded two more on the eighth and 12th holes on her way to a five-under-par 67.
She ended the day tied for sixth, two shots off outright leader Ruixin Liu of China, who was still suffering from allergies that forced her to withdraw from last week's Portland Classic.
It didn't stop her from posting a seven-under 65 on Thursday for her best round of the year and a one-shot lead over Peiyun Chien, Elizabeth Szokol, Dottie Ardina and Linnea Strom.
Liu started so well - including five birdies on her outward nine - that her lone regret came on the 12th hole when she hit her approach to 18 feet but three-putted for a par.
She had seven birdies through 13 holes and closed with five pars.
"I pretty much made everything except for hole No.12," Liu said.
"That's the only bad hole I played today, because my second shot was only like 18 feet for eagle and I three-putted."
Following her severe allergic reaction in Portland, Liu said she still didn't have a clear head for the opening round in Cincinnati and was surprised to play so well.
"I'm very happy to take it," she said.
The Queen City Championship is the final LPGA event before the Solheim Cup on September 22-24 in Spain, and some of the better performances came from Europe.
Lydia Ko and Women's PGA champion Ruoning Yin were at 68.
Australia's Gabriela Ruffels offset her six birdies with three bogies to finish the day at three-under 69 alongside players including Madelene Sagstrom of Sweden and Americans Jennifer Kupcho and Ally Ewing, the defending champion at Kenwood.
Lexi Thompson showed little improvement. Thompson is having her worst year on the LPGA Tour but still made the Solheim Cup team through the women's world ranking.
Thompson, who has missed five of her last six cuts, made double bogey on the last hole for a 73.
The LPGA Tour is coming off a week that delivered one of the biggest surprises of the year after Thai teenager Chanettee Wannasaen, a Monday qualifier who was No.367 in the world, won the Portland Classic.
Liu might be another surprise. She is a six-time winner on the Futures Tour but has never finished in the top 10 on the LPGA Tour in individual play.
She is No.250 in the world and her best result is a tie for 20th.
"I don't want to give myself too much expectation because physically I don't feel great," Liu said.
"I'm just going to take a good break, try to sleep good, and try to do the same thing tomorrow."