roger federer is through to the last 4 of the atp world tour finals after beating david ferrer in straight sets. cri's london correspondent tu yun has more from the o2 arena.
this was a battle between the two oldest players in the year's season finale.
31-year-old federer, who'd won all previous thirteen meetings against the 30 year old ferrer, getting his eleventh straight-sets victory 6-4, 7-6.
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