Three-time champion Serena Williams has withdrawn from the French Open because of an Achilles injury.

The 39-year-old had been scheduled to play her second-round match against Bulgaria's Tsvetana Pironkova.

The American has won 23 Grand Slam singles titles and was aiming to equal Margaret Court's all-time record of 24.

Williams says she thinks she needs four to six weeks of sitting and doing nothing.

[Source: BBC]