"I know it's much better than the last two days, I made some putts today, I am hitting the ball better and having fun out there," the 23-year-old said.
Tseng had her right elbow partially covered with a plaster to help with tendonitis that has been afflicting her in recent weeks but said she would remain aggressive for the final 18 holes.
"Today I just told myself I want to try and make birdie every hole and try to get close every shot, be aggressive and don't worry about too much," said Tseng, who has maintained the injury is not affecting her play.
"I will do my best tomorrow. This golf course is very tough, so you need to be patient, play smart but I will just go aggressive, be the same as today."
Futcher could have enjoyed a one-shot cushion had she not bogeyed the 18th but the 30-year-old American said her confidence remained intact despite the errant last hole.
"If I play my game, I know I can win. The tee shot in the last shot was just a bad swing," she said.
"I am just going to...try to be as consistent as I can off the tee, hitting the greens, not really change my game plan, just be patient with myself and play steady."
Shin's most challenging moment was closing out her round at the 18th with a four-foot birdie putt and the 19-year-old South Korean said she will enjoy playing in the final group on Sunday.
"Today I wasn't too nervous during the round except for the last putt... That's how important it was," Shin said.
Australia's former No.1 Karrie Webb shot one-over to be ten off the pace.
- AAP
