Posted: Thursday November 7, 2013 6:13 PM

Djokovic advances to ATP Finals semis

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LONDON (AP) - Defending champion Novak Djokovic joined top-ranked Rafael Nadal in the semifinals of the ATP World Tour Finals by defeating Juan Martin del Potro 6-3, 3-6, 6-3 on Thursday.

Djokovic, undefeated in last year's Finals, improved to 2-0 in Group B with his victory over the hard-hitting Argentine. Djokovic defeated Roger Federer in his opening match.

Nadal qualified from Group A on Wednesday when he beat Stanislas Wawrinka to clinch the season-ending No. 1 ranking for the third time.
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