At the pre-opening bell, the frontline index S&P BSE Sensex opened in red with a loss of 707.29 points or 0.86%. Sector-wise, in the pre-opening session, metals dipped 1.06%, power plunged by 0.94% and auto slipped by 1.16%. Meanwhile, TVS Holdings Ltd, Zomato Ltd and Jindal Worldwide Ltd emerged as the top gainers of BSE in the pre-opening session today.