Djokovic beats Berdych in four sets to reach semis at Aussie Open

MELBOURNE - Agence France-Presse

Serbia's Novak Djokovic celebrates after defeating Tomas Berdych of the Czech Republic in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 22, 2013. AP Photo/Andy Wong

Defending champion Novak Djokovic defeated Czech fifth seed Tomas Berdych in four sets to advance to the semi-finals of the Australian Open on Tuesday.

The Serbian world number one won 6-1, 4-6, 6-1, 6-4 in 2hr 31min on Rod Laver Arena and will face Spanish fourth seed David Ferrer in Thursday's semi-final.