The 19-year-old Californian closed with a par-72 to tie Japan's Chieko Amanuma at 4-under 212 after 54 holes. Creamer then sank an 8-foot birdie putt on the par-4 18th after Amanuma missed a 15-foot birdie putt.
'I was so nervous I was shaking watching her,' said Creamer, who has four career titles, including the NEC Karuizawa in Japan in August. 'She had a decent putt and I knew I had to make mine.'
Japan's Ai Miyazato, winner of the Japan Women's Open, shot a 74 to finish at 218.
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