Continuing its winning streak for the fourth day today, the Sensex shot up by 100.39 points in the opening trade. This follows bullish domestic sentiment and a renewed confidence in the European market recovery after Portugal's successful debt bond auction.The 30-share index gained 0.54 per cent to trade at 18,767.10 points. This is its' best close since January 18, 2008 when it settled at 19,014.The wide-based National Stock Exchange's Nifty also rose by 22.35 points to 5,630 points, an increase of 0.40 per cent.The Hong Kong's Hang Seng index was up by 0.44 per cent, while Japanese Nikkei by 0.79 per cent in morning trade. The US Dow Jones Industrial Average closed 0.45 per cent higher in yesterday's trade.