The Sensex at the Bombay Stock Exchange was trading 74 points in the positive territory at 17,765 in late morning deals, when reports last came in. The 30-share barometer, which had gained 34 points in the previous session on Friday, added 81 points in opening trade today on sustained buying by funds and retailers.The Nifty at the National Stock Exchange was trading 15 points in the green at 5,381.In Asia, Hong Kong's Hang Seng rose by 0.03 per cent, while the Japan's Nikkei by 0.10 per cent in early trade today. The US Dow Jones Industrial Average, however, ended 0.03 per cent lower in yesterday's trade.