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WASHINTON, Aug. 5 (Xinhua) -- Japan's Yoshihito Nishioka, 20, stunned Horacio Zeballos on 6-4, 6-4 on Friday to roar into his maiden ATP Tour semifinal at the Atlanta Open.
Nishioka did not drop a serve as he posted his most dominant victory so far in a week that also saw him oust fourth seeded Alexandr Dolgopolov.
He will face second seeded Aussie Nick Kyrgios who won a tight match against fifth seed Fernando Verdasco 6-4, 6-7 (7/5), 6-3.
"I've been working on my serve a lot. More percentage, more power," said Nishioka.
