Chinese Taipei's Candie Kung carded an eight-under-par 64 to take a two-shot lead at the Canadian Pacific Women's Open in Vancouver.
Sitting two strokes behind Kung are world number two Lydia Ko, who fired a four-under-par 68, and overnight leader Karine Icher, who hit a two-under-par 70.
World number one Inbee Park surged up the leaderboard into a tie for eighth after recording a three-under-par 69, while defending champion So Yeon Ryu also made it through to the weekend despite registering a level-par 72.
Kung, who finished with a total score of 11-under-par 133, began on a high as she made consecutive birdies at the 10th and 11th before recording an eagle at the par-five 13th. Her superb run continued into her back nine as she made four birdies, three of which came in a row from the sixth to the eighth hole.
Ko, who has a total score of nine-under-par 135, also enjoyed a lot of success on Friday as she made two birdies on both the front and back nine.
Icher started her round with a birdie at the 10th before faltering two holes later as she made a bogey. But, the Frenchwoman atoned for her mistake with birdies at the 13th and 15th. Icher's back nine proved to be fairly quiet as she made a birdie at the fourth before concluding her round with a bogey at the eighth.
China's Xi Yu Lin currently sits in a tie for fourth and is three strokes behind Kung after carding an six-under-par 66.
Five strokes behind the leader are Spain's Azahara Munoz and Stacy Lewis, who recorded a five-under-par 67 and two-under-par 70 respectively.
Park, who trails Kung by seven strokes, did not have the best of front nines on Friday as she only made one bogey. However, she shifted her game to the next level on the back nine as she proceeded to make a birdie at the 12th, an eagle at the 13th and consecutive birdies at the next two holes. But, she let herself down at the 16th by registering her second bogey of the round and subsequently finished with a score of four-under-par 140.
Meanwhile, Ryu, who amassed a total score of one-under-par 143, started her round on a high as she made two birdies on her front nine. But, she undid all her hard work by recording two bogeys on her back nine.