Tied with 51-year-old Annika Sorenstam and Madelene Sagstrom after an opening five-under 65 in alternate-shot play on Wednesday, Roussin and Weber had a 61 at Midland Country Club in the better-ball round on Thursday to reach 14-under 126.

The teams will play alternate shot Friday and finish Saturday with better ball.

"We're just going to do more of the same," Weber said. "I know that sounds so boring and I'm so sorry for that, but we're just going to keep doing what we're doing. I think what we've been doing has been working really well."

Sorenstam and Sagstrom slipped back with a 66 to be five behind.

Sorenstam is making her second regular LPGA Tour start of the year and only her third since retiring after the 2008 season.

Aussie legend Karrie Webb and teammate Marina Alex are in a share of eighth at the halfway mark. PHOTO: Dylan Buell/Getty Images.

The Hall of Famer missed the cut in the U.S. Women's Open last month, then tied for fourth last week in Nevada in the celebrity American Century Championship.

"I really like this format and, of course, playing with Madelene," Sorenstam said. "It's a highlight. She's one of the upcoming stars and has done so well. We've been playing together a little bit in Orlando. I have a great friendship with her."

Roussin, the Frenchwoman playing on Bastille Day and her mother's birthday, aced the par-3 7th.

"It helps when you have people around you to just talk to," Roussin said. "We're having fun both with our caddies as well, so we created that bubble I would say, and it just helps to think about the next shot once you've hit the previous one."

Roussin and Weber, from the Netherlands, didn't know each other very well before this week.

"We both last minute happened to be looking for a partner," Weber said. "I knew her game a little bit. I knew she was quite fun to be around, so I just texted her and said, 'Hey, I heard you're looking for a partner.'"

U.S. Solheim Cup partners Jennifer Kupcho and Lizette Salas are second, also shooting 61.

The teams comprising Australians Sarah Kemp and seven-time major winner Karrie Webb also made their move.

"We both last minute happened to be looking for a partner. I knew her game a little bit. I knew she was quite fun to be around, so I just texted her and said, 'Hey, I heard you're looking for a partner'." - Dewi Weber. 

Kemp and partner Alena Sharp shot 61 to be in a tie for third alongside rivals Matilda Castren-Kelly Tan, Tiffany Chan-Haeji Kang (62), Jodi Ewart Shadoff-Emma Talley (64) and Pornanong Phatlum-Pavarisa Yoktuan (64) at 10-under.

Webb and Marina Alex shot 62 to be at nine-under along with Sorenstam and Sagstrom, and Sophia Popov-Anne van Dam (61) and A Lim Kim-Yealimi Noh (62).

Sisters Nelly and Jessica Korda (63) are at eight-under.

Sarah Jane Smith of Queensland and Colombian Mariajo Uribe recorded the fourth 59 in the tournament's three-year history (there has also been one 58).

They made 11 birdies, including eight on the back nine. It was a vast improvement from their first-round 74, getting them to seven-under for the tournament and into a tie for 16th.

"I think genuinely it's the most fun I've had on the golf course," Smith said. "I always love playing with Mariajo. To have her on my team today was extra fun."

The tournament is scheduled to end Saturday so players can head to France next week for the fourth major of the year at the Evian Championship.