TSX set to open lower; focus on earnings

(Reuters) - Stock futures pointed to a lower opening for Canada's main stock index on Tuesday as investors awaited corporate earnings reports and manufacturing data.September futures on the S&P TSX index were down 0.33 percent at 7:15 a.m. ET. RBC Manufacturing PMI data is due at 09:30 a.m. ET . Canada's main stock index notched its fourth straight day of gains on Friday, with the heavily weighted financials and materials sectors leading the way as investors sought value after a bl