World number one Naomi Osaka has withdrawn from the Italian Open before her quarter-final against Kiki Bertens because of a hand injury.

Osaka, 21, recorded consecutive 6-3 6-3 wins over Dominika Cibulkova and Mihaela Buzarnescu on Thursday after rain had prevented play on Wednesday.

Dutch world number four Bertens advances to the semi-finals in Rome.

The 27-year-old will face Britain's Johanna Konta or Marketa Vondrousova who meet later on Friday.

Osaka will remain world number one next week, following Simona Halep's second-round exit to Vondrousova on Thursday.

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