
Circuit at True Arena Hua Hin on Friday.
The world No 301 used her aggressive groundstrokes to subdue the Thai in one hour a 30 minutes for her second US$25,000 ITF event after winning in Noto a few weeks ago.
The 26-year-old Akita whose main weapon is the forehand side will face Chinese teenager Gao Xinyu who upset third seeded Katarzyna Kawa of Poland 6-1 6-3 in just 74 minutes.
Gao, the 18-year-old world No 462 is in her first US$25,000 event final. She has yet to have a singles trophy this season after winning two US$10,000 events last year.
In the doubles finals, top pair Laura Pigossi of Brazil and Yana Sizikova of Russia beat Chinese Wei Zhanlan and Zhao Qiangqian 6-4 2-6 10-4.