PARIS 鈥 Serena Williams鈥 search for a record-equalling 24th Grand Slam title will extend into another year after an Achilles tendon injury forced her to withdraw from the French Open on Wednesday.

The American, who turned 39 this week, had been due to play Bulgarian Tsvetana Pironkova in the second round later, but after a warm-up, decided the injury was too severe.

Williams, a three-times former champion at Roland Garros, said she may not play again this year.

鈥淚 warmed up and it was a very short warmup and then I spoke to my coach and said 鈥榳hat do you think?鈥 she said.

鈥淚 was struggling to walk so that鈥檚 a tell tale sign that I should try to recover.鈥

Williams had suffered the problem during her semi-final loss to Victoria Azarenka in the US Open this month and said ahead of her Roland Garros campaign that she was not at 100% physically, but had recovered sufficiently to play.

She spoke again of the injury after her first-round win over fellow American Kristie Ahn and aggravated it while practising for her second-round match.

鈥淎n Achilles injury is a real injury you don鈥檛 want to play with as it can get worse and I don鈥檛 want to get to that,鈥 she said. 鈥淭his is not a nagging injury, it鈥檚 an acute injury. If it was my knee it would be more devastating.

鈥淚t鈥檚 just bad timing and bad luck.鈥

Williams said she was yet to decide whether she would play again this season, saying she needed two weeks of complete rest. 鈥 Reuters