Naomi Osaka became the latest player to suffer injury towards the end of a gruelling season after the four-times Grand Slam champion pulled out of her Japan Open quarter-final against Jaqueline Cristian on Friday with a leg injury.

Several players have ended their seasons early amid health and fitness struggles in the ongoing Asian swing of tournaments, including Emma Raducanu, Daria Kasatkina, Elina Svitolina and Paula Badosa.