India`s Nikhat Zareen stunned reigning world champion Paltceva Ekaterina to breeze into the women`s 51kg quarter-finals at the Bosphorus Boxing tournament in Istanbul here.

The Asian Championships bronze medallist, Zareen caused a major upset on the second day of the tournament on Wednesday when she out-punched the Russian boxer 5-0. The Indian pugilist will have yet another tough bout ahead as she takes on two-time world champion Kyzaibay Nazym of Kazakhstan in her last-eight round. Apart from Zareen, 2013 Asian champion Shiva Thapa, Sonia Lather and Parveen also registered victories in their respective categories to proceed to the quarter-finals.