Serena Williams has pulled out of next week's Rogers Cup in Montreal for "personal reasons", tournament organisers have announced.
The Wimbledon runner-up suffered the worst defeat of her professional career in San Jose earlier this week when she won just a single game against Johanna Konta.
"I know I can play a zillion times better, but I have so many things on my mind, I don't have time to be shocked," said Williams after the match.
Rogers Cup tournament director Eugene Lapierre said in a statement: "Of course, we are disappointed that Serena will not be joining us. Fans were very much looking forward to seeing her in action.
"But, beyond the disappointment, the tournament as a whole remains a high-level competition. The entire top 10 is here, along with 22 of the top 25. There are exciting matches in store from the outset."
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Williams is replaced in the main draw by Germany's Tatjana Maria, who will take on Alize Cornet of France in round one.
