GENEVA (AP) 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 well-placed forehand from the baseline.
Also Tuesday, fifth-seeded Steve Johnson of the United States advanced to the second round, winning 6-3, 6-3 against Frenchman Stephane Robert.
Janko Tipsarevic of Serbia, another wild card, beat ninth-seeded American Ryan Harrison 6-4, 7-6 (5) in a first-round match.
With a second-round match against top-seeded Stan Wawrinka as the prize, Rogerio Dutra Silva of Brazil beat Portugal's Joao Sousa 6-4, 7-6 (5).
Wawrinka is the defending champion at his home tournament.