Serena Williams continued her impressive Australian Open preparations with a straight-sets thrashing of Tsvetana Pironkova Wednesday, as world number three Naomi Osaka and top-ranked Ashleigh Barty struggled. Williams, 39, has been on belligerent form at the Yarra Valley Classic and overpowered the Bulgarian with a 6-1, 6-4 victory in 74 minutes.

"So far, so good. It's special to play here with what's going on in the world," said Williams, who only lost four games against Daria Gavrilova in her opener on Monday. Williams, aiming for a record-equalling 24th Grand Slam title at the Australian Open, broke Pironkova first up and kept her foot on the gas with 25 winners and six aces.