Sorana Cirstea defeated Katie Boulter 6–3, 6–1 in the Round of 16 at the WTA 250 event in Osaka on a hard court, confirming her status as pre-match favourite with odds of 1.78 to Boulter's 2.13. Cirstea's dominance was evident from the outset, breaking serve repeatedly to secure the first set before accelerating through the second, where she won five consecutive games to close out the match in straight sets. Boulter offered little resistance, particularly in the second set, as the Romanian's aggressive baseline play and court positioning proved decisive. The result extends Cirstea's winning form in Asia and positions her favourably in the tournament's draw.