Arianne Hartono defeated Xinyu Gao 6-1, 4-6, 6-2 in the round of 16 at the WTA 250 event in Hua Hin on hard court, an upset victory against the pre-match favourite. Gao entered as the odds-on favourite at 1.72, but Hartono's aggressive play in the opening set, where she claimed six games to one, established early momentum. Gao responded in the second set to level the match, yet Hartono regrouped decisively in the decider, taking control with a 6-2 scoreline to secure passage to the quarter-finals. The result marks a notable scalp for Hartono against a higher-ranked opponent in a best-of-three format.