HAINAN ISLAND, China (AP) Top-ranked Ariya Jutanugarn shot a 4-under 68 to take a four-stroke lead at the halfway point of the Blue Bay LPGA tournament.

Jutanugarn had birdies on the final two holes - and four of the closing seven - on Thursday to take command over the rest of the field at 7-under 137.

Jennifer Song, Moriya Jutanugarn, and Gaby Lopez shot 71s and were in a tie for second at 3-under.

First-round leader Thidapa Suwannapura carded a 75 and fell six strokes behind the leader.

The Blue Bay tournament is the last of five on the LPGA Tour's Asian swing.

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