Fourth seed Caroline Wozniacki played for the second consecutive day but showed no ill-effects with a trouble-free 6-3 6-1 win over Germany's JuliaGoerges.
The Belgian struggled to defeat Slovak Jarmila Gajdosova on Wednesday, but was far more impressive in dismissing 14th seed JuliaGoerges 6-2 7-5 on Thursday.
Former world No. 1's and Serbian Fed Cup teammates Ana Ivanovic and Jelena Jankovic will attempt to recapture their best results while German trio Sabine Lisicki, JuliaGoerges and Angelique Kerber are likely to make a push in the absence of world No. 10 Andrea Petkovic who withdrew Wednesday, citing a stress fracture in her lower back.