Japanese tennis icon and former world No. 4 Kei Nishikori said on social media Thursday that he will retire at the end of the season.Nishikori, Japan's most successful men's tennis player, said in early April he was "barely hanging on" in terms of his physical condition, after denying a report of his imminent retirement.In the announcement posted across multiple social media accounts, the 36-year-old expressed his love of tennis and pride at his career achievements."Since I was a child, I was passionate about tennis and I have continued to pursue it with only one goal in my heart: to compet…READ FULL ARTICLE
