Defending champion Novak Djokovicis out of the Australian Open, loses 2nd-round match in 5 sets to Denis IstominBy APPublishedJan. 19, 2017 3:45 a.m. ETMELBOURNE, Australia (AP) Defending champion Novak Djokovicis out of the Australian Open, loses 2nd-round match in 5 sets to Denis Istomin.