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Vikas clinched the contest 9-8 with a calculated performance to set up a clash with Ukraine`s European Championship bronze-medallist Taras Shelestyuk, who stunned third seed Andrey Zamkovy of Russia on countback after both the boxers ended the regulation three rounds at 13-13.
Earlier, L Devendro Singh (49kg), Manoj Kumar (64kg) and Jai Bhagwan (60kg) lost their respective quarterfinal bouts to bow out of the mega-event.
The 19-year-old Vikas, competing in the last bout of the day in his maiden World Championships, started aggressively, attacking his rival with jabs and right hooks in the opening round itself. But at the end of the round, the two boxers were locked 2-2.
"It is all god`s grace and my parents` blessings that I have managed to come this far," an emotional Vikas told PTI from Baku. "I was very aggressive in the first round and thought I was up at the end of it but when the coaches told me that the score is level, I decided to be slightly defensive. Instead of attacking too much, I focussed on timing my punches and the strategy paid off," he said.