ROME, May 5: World number one Serena Williams overcame a mid-match slump to defeat unseeded Andrea Petkovic in three sets at the Foro Italico on Wednesday to reach the quarterfinals of the Rome Open.
The Australian Open champion won 6-2, 3-6, 6-0 against the 49th ranked German but rarely looked to be at her best.
Serena is playing in her first tournament since winnin