Samantha Stosur has advanced to the last 16 of the Ladies Open Lausanne with a hard-fought 4-6 7-5 6-3 win over Barbara Haas.
The Australian had to claw her way back after losing the first set, but was helped by her young opponent’s inconsistent serve.
The 23-year-old Austrian mixed seven aces with 10 double faults and Stosur capitalised, winning seven out of 18 break points.
World No.134 Stosur will now meet Allie Kiick for a place in the quarter-finals after the 24-year-old American upset tournament No.5 seed Tatjana Maria 6-1 6-0.
Top seed Julia Goerges was forced to retire against Swiss teenager Simona Waltert because of a wrist injury.
The German world No.25 had several treatments on her right forearm, but eventually was forced to concede in the deciding set, as wildcard Waltert progressed 6-7 (7-5) 6-4 3-2.
The 18-year-old will next play fellow Swiss Jil Belen Teichmann after she beat Timea Bacsinszky 6-2 5-7 6-1.
Third seed Alize Cornet progressed after her 6-4 6-4 win over Italian Martina Trevisan, while No.4 seed Mihaela Buzarnescu came from behind to defeat home player Stefanie Voegele 1-6 6-1 6-0.
There were also first-round wins for Russians Ludmilla Samsonova and Natalia Vikhlyantseva.