Roger Federer sees off Juan Martin Del Potro 4-6 7-6 (7-2) 7-5 at the ATP Tour Finals in London, setting up a semi-final on Sunday against world number-one Rafael Nadal.
Roger Federer sees off Juan Martin Del Potro 4-6 7-6 (7-2) 7-5 at the ATP Tour Finals in London, setting up a semi-final on Sunday against world number-one Rafael Nadal.
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