Eun-Hee Ji will head into the final round of the JTBC Founders Cup with a one-shot lead after a late stumble from Sei Young Kim.
Kim headed into Saturday's running with a two-shot lead, and she remained out in front heading to the 16th tee. However, back-to-back bogeys saw her drop to 17-under, one behind Ji.
Ji was propelled to the front on the back of a seven-under round of 75 as she goes in search of her first win of the year.
Kim had enjoyed the running in Phoenix on the opening two days, firing a tournament-record 15-under 129 after 54 holes. However, the South Korean found the going tougher on Saturday and could only card a round of two-under.
Lewis had a 64 to thank for her share of second spot, with the American joining Kim one off the pace.
World number on Lydia Ko charged up the leaderboard and into a share of fourth after a blemish-free 64. The New Zealander moved to 15-under where she is joined by Carlota Ciganda.
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