Kei Nishikori, Japan’s tennis trailblazer, to retire at end of season

Kei Nishikori, Asia’s most decorated men’s tennis player, on Friday said that he will retire at the end of the season after a career ravaged by injury. The 36-year-old became the first Japanese player to reach a Grand Slam final at the 2014 US Open, eventually losing to Croatia’s Marin Cilic. READ: Australian Open: Nishikori