Serena Williams into Australian Open third round after testy win

American overcomes Tamara Zidansek 6-2, 6-3 Frustrated Williams racks up unforced errors Serena Williams overcame an erratic performance at the Australian Open on Wednesday to beat Slovenian Tamara Zidansek 6-2, 6-3 and advance to the third round. Related: Naomi Osaka and Coco Gauff remain on collision course at Australian Open