Kuala Lumpur: Kei Nishikori of Japan ousted top-seeded Nicolas Almagro of Spain 6-7 (5), 6-4, 6-4 on Friday to reach the semifinals of the Malaysian Open.
The eight-seeded Nishikori will next face Janko Tipsarevic of Serbia, who advanced after Nikolay Davydenko of Russia retired with a left hip injury just four games into their match. The third-seeded Tipsarevic was leading 3-1.
"I don't know what the injury is exactly yet," Davydenko said. "I'm a bit scared as I've never had anything like it before. I will still go to Beijing, maybe wait a few days and see what the pain is like."