Roddick downs Robredo to reach Australian Open quarters

MELBOURNE: Seventh seeded American Andy Roddick was in ominous form as he downed Spaniard Tommy Robredo 7-5, 6-1, 6-3 to reach the Australian Open quarter-finals on Sunday.

Playing on the Hisense Arena for the third match in a row, Roddick battled out a tight first set then steamrolled his Spanish opponent in the second and third sets to send out a warning to his rivals.

The American has been in great form at this year''s tournament, dropping only one set on his way to the last eight, against Belgium''s Xavier Malisse in the second round.

Roddick blasted 13 aces against Robredo and won 84 percent of his first serves to have the Spanish player on the back foot throughout the match.

He broke Robredo five times and wasn''t broken once -- the Spaniard only had one break point over the three sets.

Roddick''s quarter-final appearance equals his best Grand Slam performance of what was for him a disappointing 2008.

He now plays either defending champion Novak Djokovic or 2006 runner-up and crowd favourite Marcos Baghdatis for a place in the semi-finals.