The Bombay Stock Exchange benchmark Sensex today opened 75 points up on the back of selective buying by funds and retail investors amid better global cues. The 30-share index, which had lost nearly 285 points in the past two sessions, rose to 19,771 points, with oil and gas, metal and IT sector stocks leading the recovery.Likewise, the wide-based National Stock Exchange index Nifty moved up by over 23 points to 5,927 level. In Asia, the key indices Hang Seng and Nikkei were trading 0.54 per cent and 0.45 per cent up in the morning trade. In the US, the Dow Jones Industrial Index ended 0.12 per cent higher yesterday against the previous close.