Serena into Cincinnati quarter-finals

AFP
Serena Williams hits a return during her match against Samantha Stosur of Australia during a match on day 5 at Western & Southern Open on August 13, 2014 at the Linder Family Tennis Center in Cincinnati, Ohio
Serena Williams hits a return during her match against Samantha Stosur of Australia during a match on day 5 at Western & Southern Open on August 13, 2014 at the Linder Family Tennis Center in Cincinnati, Ohio (AFP Photo/Andy Lyons)

Cincinnati (AFP) - World number one Serena Williams eased past Italy's Flavia Pennetta 6-2, 6-2 to reach the Cincinnati WTA quarter-finals on Thursday.

She will face fellow American Sloane Stephens or Serbia's Jelena Jankovic for a place in the semi-finals.