World number three Roger Federer swept aside Tomas Berdych in straight sets in the opening round-robin contest at the ATP World Tour Finals.
The Swiss maestro claimed an emphatic 6-4, 6-2 win over Berdych to register his first win in Stan Smith Group.
Meanwhile, world number one and defending champion Novak Djokovic thrashed Kei Nishikori 6-1, 6-1 and will next face Federer in their second round-robin match on Tuesday.
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