MELBOURNE, Australia — The Latest from the Australian Open on Friday (all times local): 5:50 p.m. U.S. Open champion Stan Wawrinka has advanced to the fourth round of the Australian Open, overcoming a slow start to beat Viktor Troicki 3-6, 6-2, 6-2, 7-6 (7) at Rod Laver Arena. Wawrinka, the 2014 champion at Melbourne Park,