Four-time Grand Slam champion and top seed Naomi Osaka advanced to the second round of the Kinoshita Group Japan Open on Monday, defeating countrywoman Wakana Sonobe 6-0, 6-4.

World number one Aryna Sabalenka secured her spot in the Wuhan Open quarter-finals for the fourth consecutive year on Thursday, revealing she had spent part of last month practicing with Novak Djokovic while on holiday.