Djokovic serving up a storm at Open

. Melbourne(NIE)two-time defending champion Novak Djokovic powered in the fourth round of the Australian Open with a straight sets win over Czech Radek Stepanek on Friday amusing.World number one Serbian work nicely again to complete the 6-4, 6-3, 7-5 victory over the Czech, ranked 31 in 2hr 22min on Rod Laver Arena.Djokovic will face either U.S. 20 next seed 15th seed Sam Querrey or Stanislas Wawrinka in the round of 16 on Sunday.Djokovic did not go down the service in three rounds in the Open this year and has worked a five-point break against him in the service 43 games.Kept coming Stepanek in Djokovic and he ventured to net 67 times in an attempt to cut footage Join top seed.Chased Stepanek everything down and Djokovic was down a break point in the seventh game before losing the first set when he scored a forehand service only half.Djokovic settled in breaking groove and Stepanek serve again in the eighth game of the second set, when stranded in the Czech Republic in the net and seed ball past him.Djokovic served for the set and Stepanek needed opening game 17 - Last minute in the final set before the service contract, and the world number one stepped up the pressure.Defending champion fought off a break point in the eighth game but gotWinning three games later break, and served out for victory.