FILE PHOTO - Tennis - Australian Open - Melbourne Park, Melbourne, Australia - 22/1/17 Japan's Kei Nishikori hits a shot during his Men's singles fourth round match against Switzerland's Roger Federer. REUTERS/Thomas Peter
(Reuters) - Top seed Kei Nishikori survived a tough slog against unheralded opponent Carlos Berlocq before winning his semi-final match at the Argentina Open on Saturday.
The Japanese world number five took nearly three hours to overcome local wild card Berlocq 4-6 6-4 6-3 on the clay surface in Buenos Aires.
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