Second-seed Kei Nishikori has swept aside Mikhail Kukushkin in straight sets to progress through to the quarterfinals of the Brisbane International on Wednesday.
The 28-year-old thwarted Kukushkin's fightback and claimed a 6-3, 6-4 win over the Russian in a thrilling second round contest of the season-opening tournament, Sport24 reported.
The Asian number one will now face either Bernard Tomic or Radek Stepanek for the semi-final berth.