The only Par-5 she did not birdie was the seventh but made up with a birdie on ninth for a bogey free 68 and she has not dropped a shot in 36 holes. Inbee Park, Danielle Kang and Hyo Joo Kim - all three major champions - were tied at 17-under 196 when Sung Hyun came to the final hole.
She will take the top spot from friend Jin Young Ko, the fellow South Korean player who poured water over Park's head on the 18th green.
World No.2 Park Sung-Hyun shook off a late bogey to close with back-to-back birdies on Saturday and join Spain's Carlota Ciganda atop the leaderboard of the LPGA NW Arkansas Championship.
This win is Park's second of 2019; she was victorious at the HSBC Women's World Championship in February.
In Arkansas, England's Melissa Reid finished nine shots behind, with Georgia Hall a further two back on seven under. "But then again, it would feel nice to be the No. 1".
She was not thrilled with her front nine on Sunday - two birdies and a bogey - but four birdies on the inward half sealed the deal.
"There's still lots of golf to play tomorrow and it can go very low here", said Ciganda, a two-time victor on the LPGA Tour. But I talked with my caddie, and we both said there's still a lot of hope left, and we waited. She first became No. 1 in November 2017 and stayed there for one week.
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