Strasbourg - Top-seeded American Madison Keys overcame an inconsistent serve to reach the second round of the Strasbourg International with a 6-4, 6-3 win against countrywoman Christina McHale on Monday.
Keys had four aces but also double-faulted twice, dropped her serve twice in the first set and saved all three break points in the second set.
The 20-year-old Keys next faces Croatian veteran Mirjana Lucic-Baroni.
American Alison Riske also reached the second round after upsetting fifth-seeded Zarina Diyas of Kazakhstan 7-5, 4-6, 6-1.
Also, second-seeded Jelena Jankovic of Serbia advanced with a 7-6 (6), 6-3 win against Irina Falconi, third-seeded Samantha Stosur of Australia beat Monica Puig 6-0, 6-3, No. 4 Alize Cornet of France won 6-3, 6-3 against Qiang Wang, and No. 6 Coco Vandeweghe beat Oceane Dodin 7-6 (3), 7-5.
Results from the WTA Strasbourg Open on Monday (x denotes seed):
Kristina Mladenovic (FRA) bt Pauline Parmentier (FRA) 6-2, 4-6, 6-1
Alison Riske (USA) bt Zarina Diyas (KAZ x5) 7-5, 4-6, 6-1
Alize Cornet (FRA x4) bt Qiang Wang (CHN) 6-3, 6-3
Madison Keys (USA x1) bt Christina McHale (USA) 6-4, 6-3
Mirjana Lucic-Baroni (CRO) bt Olga Govortsova (BLR) 1-2 retired
Francesca Schiavone (ITA) bt Lauren Davis (USA) 6-4, 6-1
Samantha Stosur (AUS x3) bt Monica Puig (PUR) 6-0, 6-3
Coco Vandeweghe (USA x6) bt Oceane Dodin (FRA) 7-6 (7/3), 7-5
Jelena Jankovic (SRB x2) bt Irina Falconi (USA) 7-6 (8/6), 6-3