Petra Kvitova and Caroline Wozniacki each dropped the first set of their respective matches before recovering to advance to the quarterfinals of the BGL BNP Paribas Luxembourg Open on Wednesday.
Top-seeded Kvitova lost her first set to American Varvara Lepchenko but dropped only three games the rest of the way in the 4-6, 6-2, 6-1 win.