The Bombay Stock Exchange benchmark Sensex lost 115 points in opening trade on increased selling in banking, IT and metal stocks amid weak global cues. The 30-share index, which had lost over 781 points in the previous four trading sessions, declined by 0.68 per cent, to 16,859 points in the morning trade. The wide-based National Stock Exchange index Nifty drifted down by over 42 points to 4,993.Brokers said, weak trends on the other Asian bourses mainly dampened the trading sentiments, triggering selling by foreign funds.The Hong Kong's Hang Seng index was down 1.24 per cent, while Japan's Nikkei fell by 1.20 per cent in the morning trade on Monday.