The Sensex today opened almost 55 points higher than its previous close on emergence of select buying by funds and retail investors amid a firming trend on other Asian bourses. The 30-share barometer, which last Friday slipped 310 points on inflation worries and disappointing quarterly results by IT bellwether Infosys, gained by 55 points to 19,442 points in early trading today. Stocks of auto, metals, banking, capital goods and, oil and gas sector led to the marginal recovery. The wide-based National Stock Exchange Nifty index also swung by 13 points to 5,838 level.