in tennis, world no. 1 novak djokovic has reached the semi-finals of the atp world tour finals after defeating czech tomas berdych in straight sets. cri london correspondent tu yun reports.
djokoivc held a head-to-head advantage against berdych, winning 10 of their 11 previous meetings.
the serbian extended his lead by beating the czech 6-2, 7-6.
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