April 25 (Reuters) - Canada's main stock index opened lower on Tuesday as investors remained on the sidelines in an earnings-heavy week, while weakness in crude and copper prices weighed on miners and energy stocks.
At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's S&P/TSX composite index (.GSPTSE) was down 66.99 points, or 0.32%, at 20,609.75.
Reporting by Shristi Achar A in Bengaluru; Editing by Shweta Agarwal