GENEVA — Second-seeded Kei Nishikori of Japan eased into the Geneva Open quarterfinals, beating Mikhail Kukushkin of Kazakhstan 6-4, 6-3 on Tuesday. Ranked No. 9, Nishikori took a wild card entry after a wrist injury affected his clay-court season and did not drop serve against the 88th-ranked Kukushkin. Nishikori clinched the second-round match with a
