Rome: Serena Williams withdrew from the Italian Open on Tuesday with a recurring left knee injury.
"Serena Williams has withdrawn with a new knee pain," organisers said.
The 23-time Grand Slam champion's withdrawal comes a day after she beat Sweden's Rebecca Peterson in straight sets to set up a second round meeting with her older sister Venus.
She had been returning after more than two months out with a knee problem, in the final warm-up clay-court tournament before the French Open.
Four-time Rome winner Serena, 37, had eased through 6-4, 6-2 her first round match against Swedish qualifier Petersen.
Serena had also played Petersen in the second round at the Miami Open in March before withdrawing with a knee injury.
Her withdrawal sends Venus Williams, the 1999 winner, through to a third round meeting with either Johanna Konta of Britain or American seventh seed Sloane Stephens.
Your guide to the latest seat tally, live updates, analysis and list of winners for Lok Sabha Elections 2019 on firstpost.com/elections. Follow us on Twitter and Instagram or like our Instagram or like our Facebook page for updates from all 542 constituencies on counting day of the general elections.
Updated Date: May 14, 2019 21:53:44 IST