Sharapova has not played since she lost to world number one Serena Williams in the Wimbledon semi-finals on July 9 and played just 10 tournament so far this year.
The Rogers Cup in Toronto is a key stop on the North American hardcourt circuit before the year's final grand slam at Flushing Meadows in New York from Aug. 31-Sept 13.
(Editing by Greg Stutchbury)
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