By Alastair Himmer
MELBOURNE (Reuters) - Roger Federer will be an overwhelming favorite to reach the Australian Open quarter-finals for the eighth year in a row when he faces Spain's Tommy Robredo on Sunday.
Federer, who has been putting a positive spin on his form since being taken to five sets by France's Gilles Simon in the second round, despite some wobbles on the forehand.
"I always say you can't win a grand slam in the first week but you can lose it," said the former world number one after beating Belgian Xavier Malisse to reach the fourth round.
Federer, seeded two, is attempting to extend his own record grand slam singles tally to 17 at the year's first major.
The Dane mischievously produced a "Rafa Benitez"-style piece of paper which she read out to reporters who often accuse her of being "boring" after her last match.
Wozniacki challenged them to "ask me something different" and promptly held court over a variety of subjects, including her favorite soccer team Liverpool.
Former champion Maria Sharapova can reach the last eight by beating Germany's Andrea Petkovic, who advanced after Venus Williams retired injured in the third round.
Novak Djokovic, the men's world number three, faces Spain's Nicolas Almagro, while big-serving fan favorite Andy Roddick takes aim at Swiss Stanislas Wawrinka.
(Editing by Martyn Herman)
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