MELBOURNE, Australia (AP) — Andy Murray and Angelique Kerber had much in common heading into the first Grand Slam of the season as the No. 1 seeds. They shared an unwanted link on Sunday, though, when both were upset in the fourth round of the Australian Open. By the end of a chaotic first week at Melbourne Park, five-time finalist Murray had extended his Australian drought following a 7-5, 5-7, 6-2, 6-4 loss to No.