New York, Aug 21 - Number one Serena Williams Friday blamed a mysterious summer foot injury with forcing her withdrawal from the US Open.
The American, who has not played since winning the Wimbledon title last month, cut her right foot in Europe - reportedly at a Munich restaurant - under circumstances that have yet to be fully explained.
She underwent surgery and had hoped to be fit for the final major of the season starting a week from Monday.
The 13-time Grand Slam champion lost in the New York semi-finals a year ago to Kim Clijsters in a match in which she threatened a lineswoman over a foot fault and drew a record fine.
"It is with much frustration and deep sadness that I am having to pull out of the US Open," read a statement from Williams. "My doctors have advised against my playing so that my foot can heal."
Williams last missed a slam in 2006 at Wimbledon. (dpa)
Rio de Janeiro, May 22 : Brazil international winger Osvaldo is reportedly a summer transfer target of Ukraine's Shakhtar Donetsk and Metalist Kharkiv. 
The Hague, May 22 : Ajax football coach Frank de Boer has agreed to extend his contract until the middle of 2017.
Cambridge, May 22 : British journalist James Fuller has written a biography of former West Indies captain Brian Lara, one of the greatest cricketers of all time. 
New Delhi, May 22 : Coach Stephen Fleming credited his Chennai Super Kings' success to correct team selection and the loyalty the franchise has shown to the players. 
Mumbai, May 15 : India's only motorcycle Grand Prix team resumes battle in France this weekend with high hopes of strong results after a top-10 start for the all-new Mahindra Grand Prix machine. 
Dijon-Prenois (France), May 13 : Indian racing driver Sailesh Bolisetti's second weekend of his 2013 Euro Race Car campaign ended on a disappointing note as he finished 18th and 17th in the two races here.