Wimbledon 2012: Novak Djokovic beats Viktor Troicki to reach quarter-final

Current champion Novak Djokovic is through to the last eight at Wimbledon following a 6-3 6-1 6-3 victory over his close friend Viktor Troicki.

The Serb says it's difficult when facing someone you have known a long time - he first played his compatriot when he was just eight years old.

Djokovic will face the winner of Richard Gasquet and Florian Mayer in the quarter-final.

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