Japan's recently retired former world No. 4 Kei Nishikori enjoyed a reunion with all-time great Roger Federer in Tokyo on Sunday as the pair reflected on their rivalry and played as a doubles pair in an exhibition match.The 36-year-old Nishikori, who won three of his 11 career meetings against the 20-time Grand Slam winner from Switzerland, recalled serving as his boyhood hero's training partner for a week when 16 in Miami."I was able to learn a lot, that those were the kind of shots the world No. 1 hits and the dedication he makes in training. It was a great experience," Nishikori said at …READ FULL ARTICLE