With a closing 70 on Saturday at Blue Bay LPGA event in her native China, the 28-year-old won for the second straight week, becoming the first player to claim back-to-back titles this season on tour.
Ending Sung Hyun Park's reign as the world's top player after just one week.
"I'm really, really excited and very proud of myself and I think it's special because I won this tournament to become world number one", said the 28-year-old after the round.
The Thai superstar had a birdie attempt on the final hole, but it lipped out, preventing a playoff and handing Feng her tenth career LPGA title.
The 28-year-old Guangzhou native, a victor in Japan last week, closed with a two-under 70 to beat Thailand's Moriya Jutanugarn (70) by one stroke in the US$2.1 million co-sanctioned tournament between the China LPGA and US LPGA Tours. There's one more event, and I get to go home. There was a moment of drama on the final hole, when Jutanugarn had a birdie opportunity to force the tournament to extra holes. PHOTO: Zhe Ji/Getty Images.
"I was a little bit nervous, even shivering", Feng said of that final putt. You know, I made a lot of good putts, a lot of good shots out there.
"It's been pretty solid so far this week", Jutanugarn said.
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Moriya quickly rebounded at the next, sinking a six-foot downhill putt for birdie as Feng missed a four-footer and had to settle for par. As well as the top ranking.
As well as being China's first number one, she was also the country's first victor on the LPGA Tour (2012 Wegman's LPGA Championship).
Feng was surrounded by her compatriots after securing par and the win at the 72nd hole.
"Given that today was actually very, very windy, I really held up ground, especially with my approach shots to the greens", Feng said. "And once that was in and I was the champion, I was so delighted".
Feng moves second in the LPGA Tour standings ahead of next week's season finale, where any of the top five will be crowned the Race to CME Globe champion and win the $1million bonus prize with a victory.
"I just want 2017 to keep going", said Feng said.
In this Associated Press photo taken October 29, 2017, Feng Shanshan of China tees off at the 14th hole during the final round of the Sime Darby LPGA Malaysia at Tournament Players Club (TPC) in Kuala Lumpur.