Australian Open: Defending champs Azarenka, Djokovic knocked out in quarterfinals

MELBOURNE, Australia — Victoria Azarenka’s 18-match winning streak at the Australian Open ended in an upset 6-1, 5-7, 6-0 quarterfinal loss to Agnieszka Radwanska on Tuesday, continuing the flow of stars tumbling out of the season’s first major. ADVERTISING MELBOURNE,