Lydia Ko has advanced to the quarter-finals of the US Girl's Junior Amateur Championship at the Lake Merced Golf Club in California.
Ko, the No 2 seed, beat Californian Hee Wook Choi in the second round by 7 and 6 to match her margin of victory from round one.
In round three she faced more of a challenge against American Nicole Morales but after a tight opening five holes the world No 1 amateur pulled away to win by 2 and 1.
Ko will face Yueer Feng of Florida in the final eight.
"Everything overall today was really good," said Ko.
"I'm pretty happy. Before I play again, I'm going to hit a few driver shots and hopefully get it going in a straight line."
Ko looks likely to meet No 1 seed Ariya Jutanugarn of Thailand in the final if both can progress from their quarter-finals and semi-finals tomorrow.
The quarterfinal and semi-final matches are on Friday (local time), and the 36-hole championship final will be played Saturday.
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