Japan’s Naomi Osaka has beaten Dominika Cibulkova 6-2 6-1 at the Pan Pacific Open in Tokyo – her first match since winning the US Open.

The 20-year-old beat Serena Williams to win her first Grand Slam earlier this month – a victory overshadowed by Williams’ outbursts at the umpire.

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The third seed raced to victory in 59 minutes against Slovakia’s Cibulkova.

She will play either Barbara Strycova of the Czech Republic or Estonia’s Anett Kontaveit in the quarter-finals.

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