Serena Williams sails on, Bianca Andreescu comeback halted as Petra Kvitova falls MELBOURNE - Serena Williams strolled into the third round of the Australian Open on Wednesday but former US Open champion Bianca Andreescu's emotional comeback from 15 months out ended at the hands of Taiwanese veteran Hsieh Su-wei. Williams, 39, continued her quest to equal Margaret Court's all-time mark of 24 Grand Slams with a 6-3, 6-0 romp past 99th-ranked Serbian Nina Stojanovic in just 69 minutes on Rod Laver Arena. "l wasn't thinking as much in the second (set), as I was in the first," said Williams, who hit 27 winners in her 101st Australian Open match while again sporting her unique, one-legged catsuit inspired by track legend 'Flo-Jo'.