Canada's Naomi Ko won two matches Thursday in the U.S. Girls' Junior to advance to the quarterfinals at Tulsa Country Club.
The 17-year-old Ko, from Victoria, British Columbia, beat stroke-play medalist Megan Khang of Rockland, Massachusetts, 1 up in the round of 32, and topped Alyaa Abdulghany of Newport Beach, California, 2 and 1 in the afternoon round of 16.
Ko will face South Korea's Eun Jeong Seong on Friday morning. Seong routed Thailand's Chakansim Khamborn 6 and 5 in the round of 16.
Long-hitting Angel Yin of Arcadia, California, also powered into the quarterfinals. She beat Mexico's Maria Balcazar 4 and 3 in the morning, and eliminated South Korea's Yujeong Son 5 and 3 in the afternoon.
Yin will play Andrea Lee of Hermosa Beach, California, a 7-and-6 winner over Marni Murez of Manhattan Beach, California.