Former world No. 4 Kei Nishikori will sit out of the upcoming ATP Challenger Tour event played on home soil, the Japan Tennis Association said Tuesday.The withdrawal from the Yokkaichi Challenger starting Nov. 27 in Yokkaichi, Mie Prefecture, ends his hopes of making a return from a left knee injury before the end of the season.The 33-year-old will have missed all four Challenger Tour events sc…
