Kei Nishikori dispatched Juan Martin del Potro of Argentina in straight sets on Friday to advance to the semifinals of the Swiss Indoors.
The 7-5, 6-4 win was Nishikori's first career victory in five matches against del Potro, a former world No. 4 who claimed silver at this year's Rio Olympics in a comeback season after multiple wrist surgeries.
World No. 5 Nishikori never lost serve in the match, saving eight break points en route to the win in just under two hours.