Victoria Azarenka has withdrawn from Stanford with a viral illness.
The 2010 champion had originally chosen the event as the potential start to her return to the WTA Tour as a mother, but decided to begin her comeback on grass courts. The Belarussian will now have to delay her hard-court return a little further.
"I've been sick with a viral illness all week, and will therefore not be able to compete next week," she said in a statement.