June 22 (Reuters) - Canada’s main stock index opened flat on Tuesday as investors looked to the upcoming speeches from U.S. Federal Reserve officials after the central bank’s hawkish tilt last week weighed on risk-driven assets. * At 9:30 a.m. ET (13:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 15.41 points, or 0.08%, at 20,171.77. Reporting by Ambar Warrick in Bengaluru; Editing by Sriraj Kalluvila Our Standards: The Thomson Reuters Trust Principles.