Sunday 24 July 2016 18:31, UK
Serena Williams has withdrawn from next week's Rogers Cup in Montreal with a shoulder injury.
The world No 1 has won the event three times but will miss this year's competition ahead of the defence of her Olympic title next month.
"Due to inflammation in my shoulder, I unfortunately must withdraw," she said in a statement. "I was looking forward to competing in Montreal and I look forward to returning soon.
"Of course, we are disappointed that Serena will not play in the tournament this year," said tournament director Eugenie Lapierre.
"Because this is an Olympic year, the players have very full schedules. Sometimes your body needs rest. We hope that Serena will recover quickly and wish her much success for the rest of the season."
Williams, who won Wimbledon this month to equal Steffi Graf's open-era record of 22 grand slam singles titles, is also due to play doubles in Rio de Janeiro with sister Venus.
