Bursa Malaysia's main index opened in the red on Tuesday as it tracked the weak performance on Wall Street overnight. Rising crude oil prices and climbing United States bond yields weighed on sentiment ahead of the bell. Higher energy costs squeeze margins at many listed companies, while stronger yields pull investor money toward fixed income. The combination left local investors reluctant to buy shares aggressively at the start of the session. Volumes stayed thin in early dealings as most players waited for clearer signals. Attention now shifts to American economic releases that could set the tone for the rest of the week. Until then, the local board is likely to trade with a cautious bias.