COLLEGE PARK, Md. -- Second-seeded Nadia Petrova of Russia defeated Canada's Eugenie Bouchard 6-2, 6-2 in 52 minutes to advance to the quarterfinals of the WTA Citi Open.
The 32nd-ranked player in the world overpowered Bouchard by winning 19-of-22 first-serve points.
American Irina Falconi moved on after China's Zhang Shuai retired trailing 6-4 following the first set. Zhang played her second match in a 20-hour period and suffered from fatigue after her upset of fourth-seeded Jelena Dokic.