Top seed Naomi Osaka overwhelmed 17-year-old Wakana Sonobe 6-0, 6-4 in the opening round of the Japan Open in Osaka on Monday.

Osaka needed just 76 minutes to oust her Japanese countrywoman, using eight aces and winning 83% of her first serves (15 of 18). Osaka also converted five of 13 break opportunities.

Katie Boulter of Great Britain eliminated Czech Linda Noskova, the No. 2 seed, 7-6 (3), 6-3, to post her second Top 20 win of 2025. Ashlyn Krueger needed three sets to defeat Maria Sakkari of Greece 2-6, 6-3, 6-4.

Suzan Lamens of the Netherlands easily defeated Colombia's Emiliana Arango 6-1, 6-2, while Romania's Sorana Cirstea came from behind to defeat Moyuka Uchijima of Japan 2-6, 6-4, 6-2.

Ningbo Open

Sixth-seeded Belinda Bencic of Switzerland fought off all eight break points

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