Maria Sharapova has withdrawn from next month's Rogers Cup event in Toronto due to a hip injury.
The world No 2 has not played a competitive match since losing to Portuguese qualifier Michelle Larcher de Brito during the first week of Wimbledon in late June.
Sharapova fell over a number of times during that match, hurting herself in the process.
And the 26-year-old Russian has opted to miss the hardcourt event in Canada, with tournaments at Cincinnati and New Haven her only opportunities to find form ahead of the final Grand Slam event of the season in New York.
She said in a statement: "I am extremely disappointed that I am unable to play in Toronto next week as it's one of the best and most important tournaments of the year.
"I was looking forward to making a healthy return to the courts in front of my Canadian fans but unfortunately I'm just not recovered yet."
Tournament director Karl Hale added: "Maria is one of the fan favourites here in Toronto and we are certainly going to miss her."
The Rogers Cup starts on August 3 at the Rexall Centre at the York University campus in Toronto.