The Sensex at the Bombay Stock Exchange opened 61 points, 0.3 per cent higher, at 20,090, this morning, on the back of selective buying by funds and retail investors. But profit-booking later set in, and the Sensex gave up all its early gains, to stand 12 points, or 0.1 per cent in the red, at 20,017, in afternoon deals, a short while ago. Other regional markets in Japan, China, Hong Kong, Japan, Indonesia and South Korea were trading mixed, as investors stayed on the sidelines, ahead of the release of key U.S. home price data later in the day.