Tomas Berdych unconcerned by opponent change

Tomas Berdych has claimed that he is unconcerned by his late change of opponent at the ATP World Tour Finals this afternoon.

The world number seven was due to take on Andy Murray, but a groin injury forced the Briton to withdraw from the competition.

Instead, Berdych will take on Serbia's Janko Tipsarevic at London's O2 Arena.

"I've had quite enough time [to adjust]," Berdych told Sky Sports News. "If it happened just before the match maybe [it would be a problem].

"It could be tough but I think I've had enough time."

Berdych lost his opening match of the competition to Novak Djokovic.