Extending its winning streak for the seventh straight session, the Bombay Stock Exchange benchmark Sensex gained 138 points in opening trade. It is now trading up by 155 points at 19502. This follows sustained capital inflows from foreign funds. This is fresh 32-month high.Broad-based National Stock Exchange's Nifty which also spurted by 44 points in opening trade is now trading up by 55 points at 5851.