Nishikori, in his first match since reaching the final of the U.S. Open, broke the unseeded Ram four times to set up a quarterfinal clash with Marinko Matosevic of Australia, who beat Go Soeda of Japan 7-6 (5), 6-4.
“Physically, I am almost perfect I think," Nishikori said. “It was a good first match for me, everything worked well. I had a really tough five-setter in Australia this year with (Matosevic). He's a good player, always a dangerous player. I'll try to have a good practice tomorrow and be ready for the next one.”
Defending champion Joao Sousa of Portugal was eliminated in the first round by Benjamin Becker of Germany 7-6 (1), 6-2, and Michal Przysiezny of Poland beat Malek Jaziri of Tunisia, 4-6, 6-4, 6-2.