Sept 20 (Reuters) - Canada's main stock index opened

slightly lower on Friday as investors took a pause a day after

an oversized interest-rate cut in the United States drove

broader gains in global markets.

At 9:31 a.m. ET (13:31 GMT), the Toronto Stock Exchange's

S&P/TSX composite index was down 20.63 points, or

0.09%, at 23,845.64.

(Reporting by Nikhil Sharma in Bengaluru)