The Taiwanese-American birdied three of her last four holes in a bogey-free round to jump to an 11-under total, two shots clear of Lydia Ko and Karine Icher.
The 34-year-old Kung, who rolled in six birdies and an eagle, burst onto the LPGA tour with a three-win season in 2003 but has only won once since, in 2008.
First-round leader Icher shot a 70 to reach nine-under while teenage sensation Ko fired a 68.
Ko, who won at Vancouver Golf Club as a 15-year-old in 2012, made a pair of birdies on each nine of a steady round. China’s Lin Xiyu shot 66 to be outright fourth at eight-under. World number three Stacy Lewis looms at six-under, with Suzann Pettersen another two strokes adrift.
Canadian teenager Brooke Henderson, fresh off her maiden LPGA win at the Cambia Portland Classic which secured her tour membership, struggled through a 75 after her opening round of 70 but just made the cut at one-over.
(Writing by Jahmal Corner; Editing by Ian Ransom)
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