Anna-Lena Friedsam of Germany upset third-seeded Shuai Zhang of China 6-0, 6-0 in the first round of the Internationaux de Strasbourg in France on Monday.
Friedsam broke Zhang's serve all six times in the 48-minute match.
In other seeded action, sixth-seeded Russian Varvara Gracheva needed nearly 2frac12; hours to defeat Zhuoxuan Bai of China 6-3, 3-6, 7-6 (3). Fourth-seeded Bernarda Pera needed two hours and five minutes to beat Sophie Chang in three sets, and No. 5 Sorana Cirstea of Romania lost in straight sets to Clara Burel of France.
No. 7 Lauren Davis was a straight-sets winner over Sarah Iliev of France.
Grand Prix Son Altesse Royale La Princesse Lalla Meryem
Second-seeded Sloane Stephens opened with a 7-5, 6-4 victory over Vera Zvonareva of Russia in Rabat, Morocco.
Stephens was able to break Zvonareva's serve five times in the one hour and 46-minute match.
Top seed Martina Trevisan of Italy advanced when Spain's Nuria Parrizas Dias retired in the second set with Trevisan up a set. No. 6 Yulia Putintseva of Kazakhstan advanced with a 6-1, 6-4 decision over Aya El Aouni of Morocco.
Jana Fett of Croatia, Julia Riera of Argentina and Peyton Stearns also advanced.
--Field Level Media