Tereza Valentova defeated Elise Mertens 6–4, 6–1 in the second round of the WTA 250 event in Osaka on a hard court, confirming her status as pre-match favourite with odds of 1.82 to Mertens' 2.09. Valentova's dominant second-set performance, where she conceded just one game, underscored her superiority on the day and suggests she has found considerable momentum at the tournament. The Czech player's clinical execution in the closing stages prevented any sustained pressure from Mertens, who struggled to maintain consistency through the match. Valentova's progression to the quarter-finals positions her well within the draw, whilst Mertens will need to reassess her hard-court form moving forward.