Mirroring the weak trend in global markets, the Sensex opened with a negative gap of 75 points at 10,783. World markets witnessed selling across-the- board on account of higher crude prices, growing tension in the Middle East and a hike in overnight call rate in Japan to 0.25% after a gap of six years.Continued selling in the first half saw the index dip to a low of 10,564 - down 294 points from the previous close. Selective buying at lower levels saw the index finally settle with a loss of 180 points at 10,678.Metal and auto stocks bore the brunt of selling today. The Metal index dropped 2.2% to 8309, and the Auto index slipped 1.8% to 4540. The Bankex, Teck, FMCG and Healthcare indices were down over 1% each.The market breadth was negative - out of 2,446 stocks traded, 1,369 declined, 989 advanced and 88 were unchanged today.INDEX MOVERS & SHAKERSHindalco, Tata Motors and Grasim declined around 4% each to Rs 175, Rs 740 and Rs 1,964, respectively.Satyam slipped over 3% to Rs 722. Larsen & Toubro, Ranbaxy, Wipro, HDFC Bank and Bharti Airtel dropped over 2.5% each to Rs 2,191, Rs 335, Rs 490, Rs 729 and Rs 362, respectively.ITC, Maruti, Bajaj Auto, Dr.Reddy's, HDFC and ICICI Bank were down over 2% each to Rs 176, Rs 795, Rs 2,644, Rs 1,305, Rs 1,141 and Rs 486, respectively.While Infosys was down 1.8% at Rs 1,651, Reliance dropped 1% to Rs 1,065.Hero Honda gained over 1% to Rs 718, and SBI advanced nearly 1% to Rs 738.VALUE & VOLUME TOPPERSReliance topped the value chart with a turnover of Rs 184 crore followed by Reliance Communications (Rs 94.60 crore), Tata Steel (Rs 84.60 crore), Satyam (Rs 82 crore) and Suzlon (Rs 80 crore).Polaris led the volume chart with trades of around 37 lakh shares followed by Reliance Communications (36.14 lakh), Aftek (32.30 lakh), D-Link India (31.32 lakh) and India Cements (28.47 lakh).