Novak Djokovic reaches semifinals
LONDON -- Defending champion Novak Djokovic joined top-ranked Rafael Nadal in ATP World Tour Finals semifinals, overcoming Juan Martin del Potro on Thursday.
Djokovic, undefeated in last year's Finals, improved to 2-0 in Group B with a 6-3, 3-6, 6-3 victory over the hard-hitting Argentine.
"With his serve it's definitely a big advantage if I can get a break advantage and close it out," said Djokovic, who saved two break points early in the decider before taking del Potro's serve ...
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