MELBOURNE, AUSTRALIA - ROGER Federer is in bullish mood before his Australian Open quarter-final showdown with Juan Martin Del Potro and feels he is a match for anybody, especially when the going gets tough.

The Swiss hit back from two sets down against Tomas Berdych to stay on track for a record-equalling 14th grand slam singles title and now considers himself an iron-man of the draw.

He will be out to prove his theory on Tuesday.

'I mean, that was really close... (but) I've played five hours against Rafa (Nadal) on clay and against other players as well'.

'It's good to have five setters to see where you're at.

'In the end it becomes very mental, and I know that this is where my biggest strengths always comes into play. That's why I'm always going to favour myself in a fifth set.'

Champion Novak Djokovic meets seventh seed Andy Roddick in Tuesday's other men's quarter-final.

Jelena Dokic will ride a wave of Australian patriotism into her quarter-final with third seed Dinara Safina.

The Yugoslav-born wildcard, whose split from domineering father Damir and subsequent struggle with severe depression and injuries was played out in front of the world's media, has been cheered to the rafters by the Melbourne crowd and knows the size of the task ahead of her.

'I'm not thinking about a semi-final,' she insisted. 'Just putting in a good match'.

'I'm playing a girl that's two, three in the world, could be number one after this tournament, and is probably the favourite for the tournament at the moment with everybody going out'.

'This is like really a pure match with no pressure on me'.

'Even if I lose easily, it will not be a surprise.'

Dokic had been at the centre of an injury scare after rolling her left ankle in her last match. She did not train on Monday but later said that had always been her intention.

Tuesday's second quarter-final pitches France's Marion Bartoli against Russian Vera Zvonareva. -- REUTERS