Djokovic and Roddick advance

Novak Djokovic and Andy Roddick have reached the fourth round of the Australian Open.

Djokovic needed four sets to get past big-serving lucky loser Amer Delic 6-2 4-6 6-3 7-6 (7-4), while Roddick stepped up his performance to beat Fabrice Santoro, the oldest man in the draw making his final bow at Melbourne Park at the age of 36, 6-3 6-4 6-2.