Defending champ Djokovic stunned by Istomin

Defending champion Novak Djokovic was sensationally knocked out in the second round of the Australian Open by Uzbekistan's Denis Istomin today.

The 117th-ranked Istomin ousted the six-time winner 7-6(10/8), 5-7, 2-6, 7-6 (7/5), 6-4 in 4hr 48min on Rod Laver Arena.