Top-seeded Serena Williams has withdrawn from the Rogers Cup due to shoulder inflammation.
Williams, a three-time champion, made the announcement on Sunday. She was to receive a first-round bye in the tourney that begins Monday in Montreal.
"Due to inflammation in my shoulder, I unfortunately must withdraw from the Rogers Cup," Williams said in a statement. "I was looking forward to competing in Montreal and I look forward to returning soon."
"Because this is an Olympic year, the players have very full schedules," tournament director Eugene Lapierre said in a statement. "Sometimes your body needs rest. We hope that Serena will recover quickly and wish her much success for the rest of the season."