World number one Serena Williams has been forced to withdraw from the WTA Tour events in Istanbul, Cincinnati, and Montreal after hurting her foot stepping on broken glass at a restaurant.

"I'm so upset I won't be able to play in the upcoming events because of this foot surgery," Williams said in a statement.

"Thank you for all of your support. I can't wait to get back on the courts."

Williams was cut on her right foot by the broken glass while at a restaurant.

Just two weeks ago, the 28-year-old cruised to a fourth women's singles title at Wimbledon with a crushing 6-3, 6-2 victory over Russia's Vera Zvonareva.

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