Henderson, an 18-year-old from Ontario, Canada, finished at 4-under 67 on a course that proved as difficult as players had predicted beforehand.

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SAMMAMISH — Brooke Henderson, propelled by a hole-in-one on the 13th hole and birdies on her final two holes, held a two-shot lead Thursday midway through the first round of the KPMG Women’s PGA Championship at Sahalee Country Club.

Henderson, an 18-year-old from Ontario, Canada, finished at 4-under 67 on a course that proved as difficult as players had predicted beforehand.

Two shots behind were American Christina Kim and South Korean I. K. Kim.

Lydia Ko, the world’s top-ranked player, shot an even-par 70.

Henderson is one of the rising stars on the LPGA Tour, having moved up to No. 4 in the world. She has finished in the top 10 in nine of 14 events this season but has yet to win since her eight-shot victory in the Cambria Portland (Ore.) Classic last August. She was granted LPGA Tour membership after that win.

It was a tough day for Lexi Thompson, the top-ranked American who is No. 3 in the world. The 21-year-old shot a 75.