Japan's Kei Nishikori bowed out of Wimbledon on Wednesday after losing to Novak Djokovic of Serbia 6-3, 3-6, 6-2, 6-2 in the quarterfinals of the grass-court major. The loss marks the end of world No. 28 Nishikori's most successful ever Wimbledon appearance, having reached the final eight for the fi...