Dialed-in Djokovic downs del Potro
White-hot Serb qualifies for ATP World Tour semifinals with 19th straight win
With all due respect to David Ferrer, Tomas Berdych and Roger Federer, the evening singles match at the Barclays ATP World Tour featured two of the best three players in residence at the O2 Arena.
For the fourth consecutive match in the head-to-head history between No. 2 seed Novak Djokovic and No. 4 Juan Martin del Potro, the result wasn't clear until the maximum number of sets had been contested.
This did not deter Djokovic, who has been dialed in since losing in the US Open final ...
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