Andrea Petkovic battled back to advance to the semi-finals at the Family Circle Cup in Charleston, South Carolina on Friday while Czech qualifier Lucie Hradecka upset yet another seed with a victory over Sara Errani.
Indian tennis ace Sania Mirza and her partner Martina Hingis cruised to their second title in as many tournaments when they beat second-seeded Russian duo of Elena Vesnina and Ekaterina Makarova 7-5, 6-1 in the Miami Open final.
Top-seeded Simona Halep earned the tenth title of her career and made herself a double champion in the Arabian Gulf by capturing the Dubai Open with a tenacious and skilful 6-4, 7-6 (7/4) win over Karolina Pliskova on Saturday.
Russian 10th seed Ekaterina Makarova admitted Thursday she needed to improve her mental strength after allowing second seeded compatriot Maria Sharapova to run riot in their Australian Open semi-final.
German fourth seed Andrea Petkovic defeated second-seeded Slovakian Dominika Cibulkova 7-5, 6-3 on Thursday to become the first player to qualify for the semi-finals of the WTA Tournament Of Champions.
Wimbledon runner-up Eugenie Bouchard, Poland`s Agnieszka Radwanska, US Open finalist Caroline Wozniacki and former French Open champion Ana Ivanovic have wrapped up the last four spots at the season-ending WTA Finals in Singapore.
Sania Mirza, who will be skipping the Asian Games to focus on qualifying for the BNP Paribas WTA Finals in Singapore, and Cara Black are lying fourth in the Race to Singapore standings with just over a month to go for the season-ending WTA Finals in Singapore.