World number one Nelly Korda held her nerve during a delay for a lightning storm to win Olympic gold on Saturday and make it an American golf clean sweep at Tokyo 2020.
Korda carded a final-round 69 to finish at 17-under-par 267 and win by one stroke from Lydia Ko of New Zealand and Mone Inami of Japan, days after Xander Schauffele won the men's event.
Inami secured a silver medal for the host nation at the first extra hole when Ko missed a 10-foot putt for a par.
It went some way to making up for the agony suffered by golf fans in Japan six days ago when Masters champion Hideki Matsuyama missed out on a bronze medal in a seven-man playoff on the same Kasumigaseki Country Club course.
Hong Kong's Tiffany Chan finished the competition a respectable six-over par, just 23 shots behind winner Nelly Korda.
Korda had to sit out a lightning storm and hold off the charging pair of Inami and Rio 2016 silver medallist Ko, who both carded superb six-under par rounds of 65 to put her under immense pressure.
After almost an hour's suspension because of the storm, Inami sank a birdie putt at the 17th green to move into a tie for the lead.
But the world number 28 buried her approach into the face of a greenside bunker to drop a crucial shot when a par at the last would have forced a playoff for gold.
Ko, playing in the final group with Korda, had an eagle putt at the 17th from just off the green to make it a three-way tie at the top.
She could not make it but the birdie took her to 16-under and a par at the last meant she became the first golfer to win two Olympic medals.
Korda was embraced by her ecstatic sister and fellow Team USA player Jessica after she tapped in on the final green for gold.
The final group of Korda, Ko and India's Aditi Ashok teed off early at 8:18 am, three hours ahead of the original schedule, in an attempt to complete the full 72 holes before a tropical storm hit.
They kept Korda under immense pressure, with Inami in the group ahead setting the pace, but the ice-cool American managed to repel them all.
There was heartbreak over the closing holes for India's 23-year-old Ashok.
For much of the week she had been in the medal positions but could not find the birdie she needed to make it a three-way fight for silver and bronze.
Ashok carded her fourth consecutive round in the 60s, but her three-under 68 was only good enough for solo fourth place at 15-under par 269.
"I didn't leave anything out there, I think I gave it my 100 percent," said Ashok, the world number 200.
"But, yeah, fourth at an Olympics where they give out three medals kind of sucks." (AFP)
Korda takes women's golfing gold for US clean sweep
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