The Bombay Stock Exchange benchmark Sensex shot up by over 118 points, 0.68 per cent, in opening trade today on a flurry of buying by funds driven by rallies in global markets.The 30-share index, which had gained 218.19 points in the previous volatile session, gained another 118.48 points to reach 17,501.66 points. The wide-based National Stock Exchange index Nifty rose 35.50 points, or 0.68 per cent, to 5,233.60 points. Brokers said trading sentiments were mainly buoyed by a strong rally on Asian bourses in tandem with overnight gains in the US markets after the Federal Reserve kept benchmark rates near zero. The Hong Kong's Hang Seng index was up 0.69 per cent, while Japan's Nikkei by 0.59 per cent. The US Dow Jones Industrial Average ended 0.41 per cent higher in the previoussession.