The American Serena Williams, 9th in the world, forfeited an injury Wednesday before her second round at Roland Garros, leaving the Bulgarian Tsvetana Pironkova (157th) to pass without playing in the third round.
"It's my Achilles tendon that didn't have time to heal after the US Open," the younger Williams sisters, 39, told a press conference.
Read also
Roland Garros live: Will the French slaughter continue?