Australian Open semis and quarters

INTERLOPER: Andy Murray of Britain yells after winning a point in his win over Croatia's Marin Cilic at the Australian Open in Melbourne.

INTERLOPER: Andy Murray of Britain looks at a spectator dressed in Croatian colors who invaded the court after his semifinal win over Croatia's Marin Cilic at the Australian Open in Melbourne.

TAKING AIM: Defending women's singles champion Serena Williams of the US hits a return during her victory over China's Li Na during their semifinal match at the Australian Open in Melbourne.

WIPED AWAY: Croatia's Marin Cilic wipes his face during his semifinal match against Andy Murray of Britain at the Australian Open in Melbourne.

SEMI EXIT: Chinese tennis player Zheng Jie hits a shot during her women's singles semifinal loss against Belgian Justine Henin at the Australian Open in Melbourne.

WHOOPS: China's Li Na reacts during her semifinal loss to Serena Williams of the US at the Australian Open in Melbourne.

INTO THE FINAL: Former world No1 Justine Henin of Belgium returns a shot against China's Zheng Jie during her semifinal win at the Australian Open in Melbourne.

SCOTTISH YELL: Andy Murray of Britain yells during his win over Rafael Nadal of Spain in the quarterfinals of the Australian Open in Melbourne.

RUEFUL RAFA: Spain's Rafael Nadal has his leg checked by a trainer prior to his withdrawal from his quarterfinal match against Andy Murray of Britain at the Australian Open in Melbourne.

SPAIN PAIN: Spain's Rafael Nadal grimaces during his quarterfinal loss to Andy Murray of Britain at the Australian Open in Melbourne.

WINNING REST: Croatia's Marin Cilic falls on the court after defeating Andy Roddick of the US in their quarterfinal match at the Australian Open in Melbourne.

NOT SO HANDY: Andy Roddick of the US looks up during his quarterfinal loss to Croatia's Marin Cilic at the Australian Open in Melbourne.

POINT TO PROVE: China's Zheng Jie celebrates a point won against Russia's Maria Kirilenko during her women's singles quarterfinal match victory at the Australian Open in Melbourne.

RUSSIAN RETURN: Maria Kirilenko of Russia returns a shot against China's Zheng Jie during their quarterfinal match at Australian Open in Melbourne.

DON'T LOOK: Nadia Petrova of Russia reacts during her quarterfinal loss to Belgium's Justine Henin at the Australian Open in Melbourne.

COMEBACK CONTINUES: Former world No1, Belgium's Justine Henin, reacts after winning a point during her quarterfinal victory over Nadia Petrova of Russia at the Australian Open in Melbourne.

STRUGGLE STREET: Serbia's Novak Djokovic struggles during his five-set quarterfinal loss to Jo-Wilfried Tsonga of France at the Australian Open in Melbourne.

STING LIKE A BEE: Jo-Wilfried Tsonga of France reacts during his quarterfinal victory over Serbia's Novak Djokovic at the Australian Open in Melbourne.

FLOAT LIKE A BUTTERFLY: Jo-Wilfried Tsonga of France celebrates his quarterfinal victory over Serbia's Novak Djokovic at the Australian Open in Melbourne.

ANOTHER DELIVERY: World No1 Roger Federer of Switzerland hits a return during his quarterfinal win over Russia's Nikolay Davydenko at the Australian Open in Melbourne.

FROM RUSSIA WITH?: Russia's Nikolay Davydenko hits a return during his loss to Roger Federer of Switzerland in a quarterfinal match at the Australian Open in Melbourne.

AZARENKA'S ANGUISH: Victoria Azarenka of Belarus reacts during her quarter-final loss to Serena Williams of the US at the Australian Open in Melbourne.

SLIP DOWN: Serena Williams of the US lays on the court after slipping during her quarterfinal victory over Victoria Azarenka of Belarus at the Australian Open tennis tournament in Melbourne.

DIFFERENT DIRECTIONS: Serena Williams of the US and Victoria Azarenka of Belarus walk past each other during their quarterfinal match at the Australian Open in Melbourne.

China's Li Na reacts during her quarterfinal upset win over Venus Williams of the US at the Australian Open in Melbourne.

WHO ME?: Venus Williams of the US tries to listen to a comment during her upset quarterfinal loss to China's Li Na at the Australian Open in Melbourne.

ON THE RUN?: Venus Williams of the US is at full stretch for a shot during her upset quarterfinal loss to China's Li Na at the Australian Open in Melbourne.