LPGA Tour rookie Hae Ran Ryu shot another bogey-free 7-under 64 to push her lead to two strokes Saturday in the Walmart NW Arkansas Championship, leaving Lexi Thompson six strokes back with a round left. Ryu played her final nine at Pinnacle Country Club in 5-under 31 with birdies on Nos. Seeking her first LPGA Tour victory, the 22-year-old South Korean player was the LPGA Q-Series medalist last year.