The Sensex recovered by over 100 points in opening trade on Tuesday after three straight days of losses, in tandem with a firming trend on other Asian bourses. The 30-share barometer, which lost over 520 points in the previous three sessions, rose by 100 points, or 0.56 per cent, to 17,939 in opening trade today, with stocks of IT, auto, realty and capital goods companies supporting the recovery. In a similar fashion, the wide-based National Stock Exchange Nifty index moved up by 30.60 points, or 0.57 per cent, to 5,395 points. The Tokyo Stock Exchange's Nikkei rallied by 3.61 per cent, while Hong Kong's Hang Seng gained 0.28 per cent in morning trade on Tuesday. The US Dow Jones Industrial Average ended 1.50 per cent higher in Monday's trade.