The 19-year-old produced an unblemished round of a 67 to win on 15 under-par-273, beating Japanese Mone Inami who sit three shots back on 12 under-par-276.
Playing her first season on the JLPGA, Saranporn earned Bt5 million for her victory. She now joins Porani Chutichai in 2016 and Ornarin Sattayabanpot in 2017.