The 19-year-old finished in style with a birdie at the final hole to card 67 for a 21-under total of 267, while Lewis (68) bogeyed the last to finish second, three strokes behind.
South Korean-born players have won all six LPGA events this season, following previous victories by Choi Na Yeon, Kim Sei Young, Lydia Ko, Amy Yang and Park Inbee. Ko, a New Zealand citizen, was born in South Korea.
Kim, already a major winner after capturing the Evian Championship in France last year, bogeyed the 10th hole after her drive stopped next to a tree housing a beehive.
Officials refused to grant her a free drop, which seemed to stiffen her resolve, as she was flawless the rest of the way.
(Reporting by Andrew Both in Cary, North Carolina)
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