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Australian Open: Williams and Federer through to semi-finals

Roger FedererGetty Images

Serena Williams and Roger Federer are the first of the big stars through to the semi-finals of the Australian Open.

Federer beat Tomas Berdych in straight sets 7-6, 6-2, 6-4.

He could face world number one Novak Djokovic in the next round on Thursday.

Serena WilliamsEPA

Serena Williams beat Maria Sharapova 6-4, 6-1.

She's aiming for her 22nd Grand Slam title by winning this tournament.

Williams will take on Poland's Agnieszka Radwanska in her semi-final.