Taiwanese boxer Lin Yu-ting became the second fighter at the centre of a Paris Olympics gender row to guarantee herself a medal after convincingly winning her quarter-final on Sunday. Lin, who together with Algerian boxer Imane Khelif is at the centre of a storm over their eligibility, defeated Bulgaria's Svetlana Staneva on an unanimous points decision to reach the semi-finals of the women's 57kg category. With her second win of the tournament, the 28-year-old Lin is certain to win a medal because losing semi-finalists in the boxing take home bronze. After a scrappy and tetchy fight, the 34-year-old Staneva made an X sign with her fingers to the crowd and, clearly angry, declined to speak to reporters.