The Bombay Stock Exchange benchmark Sensex rose by over 137 points in opening trade today on fresh buying by funds and retail investors in select stocks amid a firming trend on other Asian bourses. The 30-share barometer, which lost 164.73 points in yesterday's trade, recovered by 137.70 points, or 0.77 percent, to 17,984.94 in the first few minutes of trade today. Exchange Nifty index rose by 32.40 points to 5,381.35 points.