New Haven - Canadian Eugenie Bouchard breezed past higher-ranked American Lauren Davis 6-3, 6-1 to advance to the second round of the Connecticut Open on Monday.
Bouchard, a wild-card entry, next faces top-seeded Agnieszka Radwanska in the final hard-court tuneup for the US Open, which begins next Monday.
Bouchard, who reached a career-best No 5 in the rankings in 2014, has struggled recently, slipping to 74th.
In other matches, Kirsten Flipkens of Belgium beat Lesia Tsurenko of Ukraine 6-2, 6-3, and Romania's Ana Bogdan got past Russia's Elena Vesnina, 7-5, 7-5.
Results from WTA tournament at New Haven, Connecticut on Monday:
Eugnie Bouchard (CAN) bt Lauren Davis (USA) 6-1, 6-3
Peng Shuai (CHN x8) bt Katerina Siniakov (CZE) 1-6, 6-3, 7-6 (7/3)
Tmea Babos (HUN) bt Kristina Mladenovic (FRA x4) 7-5, 7-5
Daria Gavrilova (AUS) bt Kristna Plskov (CZE) 7-5, 4-6, 7-5
Kirsten Flipkens (BEL) bt Lesya Tsurenko (UKR) 6-2, 6-3
Ana Bogdan (ROM) bt Elena Vesnina (RUS x5) 7-5, 7-5
Darya Kasatkina (RUS) bt Barbora Zhlavov Strcov (CZE x7) 7-5, 6-3
Anastasia Pavlyuchenkova (RUS x6) bt Christina McHale (USA) 3-6, 6-2, 6-4