Lexi Thompson shot an 8-under 64 Saturday in the third round of the LPGA Thailand to establish a four-stroke lead over Korean In Gee Chun at Siam Country Club.
The fourth-ranked American fired nine birdies — against a lone bogey on the 16th — for an overall 16-under 200.
"I missed a putt on the first hole which got me down a little bit, but I tried to stay positive going into the next hole and fire at pins like I did the first day," said Thompson, who is chasing her seventh LPGA Tour career victory.
Thompson has won four out of the six times she has led after the third round.
Chun carded three birdies on both the front and back nine for a 6-under 66.
Overnight leader and defending champion Amy Yang (70) had five birdies and three bogeys. The South Korean is five shots off the lead.