Top-seeded Jelena Jankovic won twice but three high seeds were upset victims Wednesday at the WTA tournament in Nuremberg, Germany.
Serena Williams ran her personal winning streak to 26 matches with an impressive second-round win at the French Open.
Third-seeded Klara Zakopalova advanced but No. 8 Laura Robson suffered an early upset Monday in the opening round of the inaugural Katowice Open.
Five-time champion Serena Williams barely avoided a fourth-round upset and Maria Sharapova posted a quick win Monday in fourth-round play at the Sony Open.
Third-seeded Maria Sharapova rolled to a win but sixth-seeded Angelique Kerber took a tumble Sunday in third-round play at the Sony Open in Miami.
Maria Sharapova joined the quarterfinals field at the BNP Paribas Open Tuesday with a two-set victory of Lara Arrubarrena-Vecino of Spain.
Second-seeded Maria Sharapova and No. 3 Agnieszka Radwanska each moved on with third-round victories Sunday and the BNP Paribas Open.
Yulia Putintseva took a third-set tiebreaker Monday in claiming a first-round win at the Dubai Duty Free Tennis Championships.
Oscar Pistorius charged with murder ... Serena Williams nears return to No. 1 .. .Federer, del Potro advance in Rotterdam ... Matt White's wife unstable, lawyer says ... Sports news from United Press International.
World No. 1 Victoria Azarenka didn't lose a game Thursday at the Qatar Total Open but Serena Williams pulled within one win of taking the rankings' top spot.