Serena Williams told her fans she's feeling better, but the WTA tour said her recent foot injury could jeopardise her participation in the US Open.

Williams cut her right foot on broken glass at a restaurant shortly after winning her fourth Wimbledon title.

The 13-time Grand Slam champion said last weekend that she would miss events in Istanbul, Cincinnati, and Montreal prior to the US Open, the last Grand Slam of the year which starts on August 30 in New York.

"Hey guys I'm doing better," Williams tweeted yesterday.

"Thanks for all the love."

But WTA tour spokesman Andrew Walker said that Williams is questionable for the final Grand Slam of the year.

Williams' World Team Tennis team, the Washington Kastles, said she needed stitches on the bottom of her foot.

On Sunday night she tweeted that she was anxious to get back to work.

"Can't wait to get out of bed and back on the courts and do what I do best!" she wrote.

Williams fell in the semi-finals of last year's US Open to eventual champion Kim Clijsters in a match marred by the American's abusive tirade toward a line judge.

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