World No. 8 Ratchanok won the Super 750 tournament, beating world No. 4 Chen Yufei of China 21-15, 13-21, 21-16 in a 65-minute, hard-fought encounter.
It was Ratchanok's second title victory at the Malaysian Open, and fetched her prize money of US$47,250. Runner-up Chen received $22,950.