Result: Petra Kvitova beats Agnieszka Radwanska in straight sets

Result: Kvitova beats Radwanska in straight sets
© AFP
Petra Kvitova beats Agnieszka Radwanska 6-4 6-4 at the WTA Championships in Istanbul.

Petra Kvitova has beaten Agnieszka Radwanska in straight sets at the WTA Championships in Istanbul.

The Czech progressed with a 6-4 6-4 win over Radawanska in a match that lasted two hours and 12 minutes on the indoor court.

Kvitova eventually clinched it after a lengthy rally ended with Radwanska over-hitting a return after a back-and-forth final game.

The world number seven will now play Serena Williams in the next round after the American overcame Angelique Kerber in just over an hour in the day's earlier game.

Serena Williams celebrates a point against Mona Barthel of Germany during the Western & Southern Open on August 15, 2013
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