Na Yeon Choi fired a one-under 71 on Friday to stroke lead following the second round of the CME Group Titleholders.

Choi, who has finished outside the top-three only once in her last four events, had five birdies and two bogeys after an opening double-bogey set her back early at Grand Cypress Resort. Still, she managed to finish 36 holes at seven-under 137, good enough for her seventh such lead on the LPGA Tour.

Choi's converted only two of six such leads into victory, though both came in her last three attempts. Under normal circumstances, her performance in the last couple months would garner more attention, but world No. 1 and Player of the Year Yani Tseng has been the center of attention with her outstanding season.

Still, Choi has a good chance to become the fifth two-time winner on tour this season and would join Tseng (seven wins), Suzann Pettersen, Brittany Lincicome and Karrie Webb.

Sandra Gal, who is also looking for her second win of 2011, shot her second straight three-under 69 and sits alone in second at six-under. Hee Young Park (69) and Paula Creamer (71) share third at four-under 140.

Wendy Ward (71) is fifth at minus-three.