TORONTO, May 20 (Reuters) - Canada's main stock index was higher shortly after the open on Wednesday with the most influential gains attributed to energy and mining stocks, which offset declines in most other sectors.
The Toronto Stock Exchange's S&P/TSX composite index rose 9.35 points, or 0.06 percent, to 15,130.37. Seven of the index's 10 main groups were in the red, however. Energy stocks were up 0.8 percent, while materials rose 0.6 percent. (Reporting by Solarina Ho; Editing by Jeffrey Benkoe)