Naomi Osaka, now ranked 18 in the world, said she was 'at peace' with herself and feeling good about her game. (AFP pic) TOKYO: Former world number one Naomi Osaka said she would "keep attempting" to get back to her Grand Slam-winning best after her season ended with a second-round exit in Japan on Thursday.

The four-time Grand Slam champion lost 6-3, 7-5 to Slovakian 18-year-old Mia Pohankova, ranked 144 in the world, at the Pan Pacific Open in Tokyo.

Osaka has not won a title this year and has not reached a Grand Slam final since she returned to tennis after a 15-month break following the birth of her daughter Shai in 2023.

The 29-year-old, now ranked 18 in the world, said she was "at peace" with herself and feeling good about her game.