Billie Jean King sends message to Kei Nishikori as he confirms his retirement with Japan Open loss

Japanese tennis star Kei Nishikori has officially confirmed his retirement from professional tennis following a loss at the Japan Open in October 2026. Tennis legend Billie Jean King publicly sent a message to Nishikori marking the end of his career. Nishikori, widely regarded as a trailblazer for Japanese tennis, had a long and successful career on the ATP tour.