Japanese world No. 9 Kei Nishikori crashed out of the Italian Open on Thursday as he suffered a 7-6(4), 6-3 defeat to Argentina's Juan Martin del Potro in the third round of the men's singles.The seventh-seeded Nishikori, coming back from a right wrist injury, lost the opening set in a tiebreaker after struggling with his first serve, a main factor in his straight-sets victory over Spain's David Ferrer in the second round.In the round of 16 match at the Foro Italico in Rome that lasted 1 hour, 54 minutes, Nishikori failed to generate a single breakpoint chance in the second set as he saw hi…READ FULL ARTICLE