Japan’s four-time Grand Slam champion Naomi Osaka and former men’s No. 4 Kei Nishikori both lost at Wimbledon on Wednesday. Osaka made her first appearance at the tournament since 2019 on Monday when she topped Diane Parry of France in three sets, but the former world No. 1 came unstuck on Centre Court against Emma Navarro of the United States in the second round, going down 6-4, 6-1. The 26-year-old Osaka, who returned from a maternity break in January, gave 17th-ranked Navarro the only break of the first set when she failed to win a point in the seventh game. Navarro jumped to a 4-0 lead in …