Belarus's Victoria Azarenka (L) walks on court during her women's singles match against Poland's Agnieszka Radwanska

Australian Open 2014: Victoria Azarenka becomes latest big name player to crash out in Melbourne

The defending champion was beaten by Agnieszka Radwanska

Rafael Nadal celebrates his quarter-final triumph

Australian Open 2014: Rafael Nadal battles to four-set victory over Grigor Dimitrov to reach the semi-finals

But defending women's champion Victoria Azarenka is out

Andy Murray (pictured practicing with coach Ivan Lendl, left) could be involved in three Davis Cup matches next week

Australian Open 2014: Ivan Lendl lets facade drop to praise Andy Murray's recovery

Coming from Old Stoneface himself, this was praise indeed for Andy Murray. "He is hitting the ball great," Ivan Lendl, the Scot's coach said. "I think he has played enough matches now. I am not concerned about that."

Ana Ivanovic of Serbia reacts to a point to Eugenie Bouchard of Canada during her defeat at the quarter-final stage

Australian Open 2014: Eugenie Bouchard battles back from a set down to knock out Ana Ivanovic - and win even more hearts in Melbourne

The Canadian youngster looked completely at home as she knocked out Serena Williams' conqueror to reach the semi-finals with a 5-7 7-5 6-2 win

Liam Gallagher battles Aussie Open heat with freshly shaved head (and bomber jacket) in bizarre tennis-related PR stunt

The Beady Eye singer showed off his backhand – and a closely shaved new haircut – in the Hot Shots area of Melbourne Park

Roger Federer is in his best form since his 2012 Wimbledon success, claims Greg Rusedski

Australian Open 2014: Victory in Melbourne would be Roger Federer's 'biggest triumph', claims Martina Navratilova

Andy Murray could also rank the achievement among his greatest triumphs due to the difficult draw

Na Li of China is interview on court after winning her quarterfinal match against Flavia Pennetta

Australian Open 2014: Li Na reaches semi-finals with straight-forward victory over Flavia Pennetta

The Chinesewoman's semi-finals opponent will be Canadian teenager Eugenie Bouchard

Roger Federer is in his best form since his 2012 Wimbledon success, claims Greg Rusedski

Australian Open 2014: Andy Murray will face a resurgent Roger Federer in his best form since 2012, warns Greg Rusedski

Rusedski believes Federer is playing his best tennis since his last Grand Slam victory at Wimbledon two years ago

19-year-old Kyle Edmund has been selected in Great Britain's Davis Cup squad

Australian Open 2014: Kyle Edmund could partner Andy Murray after inclusion in Great Britain Davis Cup squad

The 19-year-old was named for the first time by captain Leon Smith and could be handed the second doubles slot to play alongside the Wimbledon champion after impressing

Czech tennis star Tomas Berdych beat third seed David Ferrer to move into the Australian Open semi-finals

Australian Open 2014: Tomas Berdych beats third seed David Ferrer to progress to last four in Melbourne for the first time

The Czech star rattled through the first two sets before overcoming a brief blip in the third to beat the Spaniard 6-1 6-4 2-6 6-4 and book his place in the semi-finals

The Sport Matrix: Tuesday 21 January 2014

Lugano lifts spirits at West Brom as Everton miss out

Sloane Stephens pictured at the Australian Open

Australian Open 2014: Sloane Stephens denies she was celebrating loss of Serena Williams to Ana Ivanovic

The American said she was mimicking members of Ivanovic's entourage

Andy Murray gives away his racket which he broke during his victory over Stephane Robert

Australian Open 2014: Roger Federer to give Andy Murray first true test since his return

British No 1 to face the rejuvenated Swiss he beat in last year’s semi-finals

Roger Federer of Switzerland plays a forehand in his fourth round win against Jo-Wilfried Tsonga

Australian Open 2014: Roger Federer to face Andy Murray in quarter-finals following victory over Jo-Wilfried Tsonga

The former world number one has looked in ominous form in Melbourne

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