Leader An does not sweat big purse

MIAMI - An Na-rin claimed she was not feeling any pressure, as she fired a bogey-free eight-under 64 to seize a one-stroke lead after the opening round of the LPGA's season-ending Tour Championship on Nov 21.

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The South Korean reeled off three birdies in a row starting at the 11th hole and sank eight birdies overall to finish one ahead of American Angel Yin, who made a long eagle putt from the fringe at the par-five 17th to sit second.

"I played well," An said. "My putting was really good. The speed was good and the shape was good. I was just trying to focus a little bit more."

Americans Marina Alex and Allisen Corpuz shared third on 66.

The top 60 players in the season points chase qualified for the US$11 million (S$14.8 million) showdown, with a US$4 million top prize at Tiburon Golf Club in Naples, Florida.