Of his 26 previous quarter-final appearances, Federer has converted 24 into semi-finals, gone on to reach 20 finals and won 14 of them.

However, Federer refused to single out himself and Nadal as the only title threats, as he think the top seeds in the tournament are playing extremely well.

He will face close friend and fellow Wawrinka in next game, which will be the first all-Swiss quarterfinal at a Grand Slam in the Open Era.

Third seed Novak Djokovic beat 14th seed Spanish Nicolas Almagro 6-3 6-4 6-0 to set up a last eight encounter with Thomas Berdych.

In women's draw, top seed Wozniacki defeated unseeded Latvian Anastasija Sevastova in straight sets 6-3 6-4 in the fourth round.

Wozniacki only needs one more win in Melbourne to keep her No.1 ranking.

Meanwhile, 2010 French Open champion Italia's Francesca Schiavone beat 30th seed Russian Svetlana Kuznetsova 4-6 6-1 14-16 in a four hours and 44 minutes fourth round match, breaking the tournament's longest women's single record.?? The pair has broken Barbora Zahlavova Strycova and Regina Kulikova's record on the longest women's Gland Slam match, where Strycova spent four hours and 19 minutes to beat Kulikova in 2010 Australian Open.

The pressure both players felt was incredible, Schiavone later likening every match to a match point.

"It's like every points are match point. You have to keep going. You know that physically you are tired, but the other one, too," She told reporters in Melbourne after the long-lasting match.

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