Japanese ace Kei Nishikori withdrew from the Madrid Open tennis tournament Friday after feeling pain in his right wrist during prematch practice.The world No. 8, who returned to competition this week after sitting out a month and a half due to injury to the wrist, had been scheduled to meet second-seeded Novak Djokovic of Serbia in the men's singles quarterfinals.Nishikori, seeded sixth at this tournament, was seen massaging his right wrist while practicing groundstrokes and serves. He left practice early after consulting his coach Dante Bottini.The 27-year-old Japanese, who received a bye …READ FULL ARTICLE