5 live: Djokovic v Del Potro

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Listen to live commentary of Novak Djokovic versus Juan Martin del Potro in the final day of round robin action at the ATP World Tour Finals at London's O2 Arena.

The winner of group B, which is currently led by Swiss world number two Federer, will face Andy Murray in Sunday's semi-final.

Commentary will begin at 1345 GMT.

Available to UK users only.